API Authentication

Introduction

Coinbase Developer Platform (CDP) uses three distinct types of authentication keys, each serving a specific purpose:

Server requests:

These keys should be stored securely, and used only by trusted back-end services:

Secret API Key: For all server-to-server communication (i.e., REST APIs).
Wallet Secret: Additional requirement for any server-to-server communication that involves sensitive wallet operations (i.e., signing transactions via REST APIs).

Client requests:

These keys are designed for client-side communication, and are safe to include in end-user code:

Client API Key: For all client-side communication (i.e., JSON-RPC APIs).

Client API Key

The Client API Key is designed specifically for client-side applications. This key:

Is present within your RPC endpoint URL (i.e., https://api.developer.coinbase.com/rpc/v1/base/<MY-CLIENT-API-KEY>)
Authenticates JSON-RPC requests from browser-based applications and mobile apps
Is safe to include in client-side code
Has limited functionality by design
Can be easily rotated if needed

1. Create Client API Key

To create a Client API Key:

Navigate to your API Keys dashboard.
Select your desired project from the top drop-down.
Select the Client API Key tab.
Copy the generated key.
Export as an environment variable:

export CLIENT_API_KEY="your_client_api_key"

Click the Rotate button to expire this key and generate a new one.

2. Authenticate

To authenticate your client-side code, include it with your JSON-RPC request:

curl -L -X "$HTTP_METHOD" https://api.developer.coinbase.com/rpc/v1/base/${CLIENT_API_KEY} \
  -H "Content-Type: application/json" \
  -d '${REQUEST_BODY_JSON}'

As an example, you can request the List Historical Balances JSON-RPC endpoint like so:

curl -L -X POST https://api.developer.coinbase.com/rpc/v1/base/${CLIENT_API_KEY} \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "cdp_listBalances", "params": [{"address":"0xF7DCa789B08Ed2F7995D9bC22c500A8CA715D0A8","pageToken":"","pageSize":1}]}'

Secret API Key

The Secret API Key is required for all server-to-server communication with CDP APIs. This key:

Is used to generate a Bearer Token (JWT), which authenticates your CDP project ownership
Is used in the Authorization header of your request
Is required as the base layer of authentication for all server endpoints
Must be kept secure and never exposed in client-side code
Can be configured with IP allowlists and more granular permissions

1. Create Secret API Key

To create a Secret API Key:

Navigate to your API Keys dashboard.
Select your desired project from the top drop-down.
Select the Secret API Keys tab.
Click Create API key and name your key.
Optional: Configure additional settings
- IP allowlist
- Permission restrictions
- Signature algorithm (Ed25519 recommended)
Click Create & download.

A modal will appear with your key details.

Make sure you save the API key ID and Secret in a safe place. You can’t re-download it later.

To regenerate a Secret API key, click Configure to delete and recreate the key.

2. Generate Bearer Token

Bearer Tokens (JWTs) are required for server-to-server communication only, are included in your Authorization header, and are generated using your Secret API Key.

Use our SDK for easier authentication

The CDP SDK automatically handles generation of Bearer Tokens for you, streamlining the process of making requests to all of our REST endpoints.

For REST API users, continue reading to:

Set up your environment for Bearer Token generation by configuring environment variables and installing dependencies
Export your generated Bearer Token as an environment variable

Show More on JWTs

A JWT is a compact, self-contained, stateless token format used to securely transmit API keys as a JSON object for authentication with the CDP API. They are typically included in the Authorization header of your request.

Environment setup

To begin, export the following environment variables:

export KEY_NAME="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
export KEY_SECRET="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=="
export REQUEST_METHOD="GET"
export REQUEST_PATH="/platform/v2/evm/token-balances/base-sepolia/0x8fddcc0c5c993a1968b46787919cc34577d6dc5c"
export REQUEST_HOST="api.cdp.coinbase.com"

Complete the remaining setup steps for JWT generation below according to your language choice.

Generate Bearer Token (JWT) and export

First, install the CDP SDK:

npm install @coinbase/cdp-sdk

Create a new file for JWT generation code:

main.js

const { generateJwt } = require("@coinbase/cdp-sdk/auth");

const main = async () => {
  // Generate the JWT using the CDP SDK
  const token = await generateJwt({
    apiKeyId: process.env.KEY_NAME,
    apiKeySecret: process.env.KEY_SECRET,
    requestMethod: process.env.REQUEST_METHOD,
    requestHost: process.env.REQUEST_HOST,
    requestPath: process.env.REQUEST_PATH,
    expiresIn: 120 // optional (defaults to 120 seconds)
  });
  
  console.log(token);
};

main();

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(node main.js)
echo $JWT

First, install the CDP SDK:

npm install @coinbase/cdp-sdk

Create a new file for JWT generation code:

main.js

const { generateJwt } = require("@coinbase/cdp-sdk/auth");

const main = async () => {
  // Generate the JWT using the CDP SDK
  const token = await generateJwt({
    apiKeyId: process.env.KEY_NAME,
    apiKeySecret: process.env.KEY_SECRET,
    requestMethod: process.env.REQUEST_METHOD,
    requestHost: process.env.REQUEST_HOST,
    requestPath: process.env.REQUEST_PATH,
    expiresIn: 120 // optional (defaults to 120 seconds)
  });
  
  console.log(token);
};

main();

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(node main.js)
echo $JWT

First, install the CDP SDK:

npm install @coinbase/cdp-sdk

Create a new file for JWT generation code:

main.ts

import { generateJwt } from "@coinbase/cdp-sdk/auth";

const main = async () => {
    // Generate the JWT using the CDP SDK
    const token = await generateJwt({
        apiKeyId: process.env.KEY_NAME!,
        apiKeySecret: process.env.KEY_SECRET!,
        requestMethod: process.env.REQUEST_METHOD!,
        requestHost: process.env.REQUEST_HOST!,
        requestPath: process.env.REQUEST_PATH!,
        expiresIn: 120 // optional (defaults to 120 seconds)
    });
    
    console.log(token);
};

main();

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(npx tsx main.ts)
echo $JWT

First, install the CDP SDK:

pip install cdp-sdk

Create a new file for JWT generation code:

main.py

import os
from cdp.auth.utils.jwt import generate_jwt, JwtOptions

# Generate the JWT using the CDP SDK
jwt_token = generate_jwt(JwtOptions(
    api_key_id=os.getenv('KEY_NAME'),
    api_key_secret=os.getenv('KEY_SECRET'),
    request_method=os.getenv('REQUEST_METHOD'),
    request_host=os.getenv('REQUEST_HOST'),
    request_path=os.getenv('REQUEST_PATH'),
    expires_in=120  # optional (defaults to 120 seconds)
))

print(jwt_token)

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(python main.py)
echo $JWT

First, install the CDP SDK:

go mod init jwt-example
go get github.com/coinbase/cdp-sdk/go

Create a new file for JWT generation code:

main.go

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/coinbase/cdp-sdk/go/auth"
)

func main() {
    // Generate the JWT using the CDP SDK
    jwt, err := auth.GenerateJWT(auth.JwtOptions{
        KeyID:         os.Getenv("KEY_NAME"),
        KeySecret:     os.Getenv("KEY_SECRET"),
        RequestMethod: os.Getenv("REQUEST_METHOD"),
        RequestHost:   os.Getenv("REQUEST_HOST"),
        RequestPath:   os.Getenv("REQUEST_PATH"),
        ExpiresIn:     120, // optional (defaults to 120 seconds)
    })
    if err != nil {
        log.Fatalf("error building jwt: %v", err)
    }
    
    fmt.Println(jwt)
}

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(go run main.go)
echo $JWT

First, install required dependencies:

gem install jwt
gem install ed25519

Create a new file for JWT generation code:

main.rb

require 'jwt'
require 'ed25519'
require 'base64'
require 'time'
require 'securerandom'

# Fetching environment variables
key_name = ENV['KEY_NAME']
key_secret = ENV['KEY_SECRET']
request_method = ENV['REQUEST_METHOD']
request_host = ENV['REQUEST_HOST']
request_path = ENV['REQUEST_PATH']

def build_jwt(key_name, key_secret, uri)
  # Decode the Ed25519 private key from base64
  decoded = Base64.decode64(key_secret)
  
  # Ed25519 keys are 64 bytes (32 bytes seed + 32 bytes public key)
  if decoded.length != 64
    raise "Invalid Ed25519 key length"
  end
  
  # Extract the seed (first 32 bytes)
  seed = decoded[0, 32]
  signing_key = Ed25519::SigningKey.new(seed)
  
  # Header for the JWT
  header = {
    alg: 'EdDSA',
    typ: 'JWT',
    kid: key_name,
    nonce: SecureRandom.hex(16)
  }

  # Claims for the JWT
  claims = {
    sub: key_name,
    iss: 'cdp',
    aud: ['cdp_service'],
    nbf: Time.now.to_i,
    exp: Time.now.to_i + 120, # Expiration time: 2 minute from now.
    uri: uri
  }

  # Encode the JWT with EdDSA algorithm
  JWT.encode(claims, signing_key, 'EdDSA', header)
end

# Build the JWT with the URI
token = build_jwt(key_name, key_secret, "#{request_method.upcase} #{request_host}#{request_path}")

# Print the JWT token
puts token

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(ruby main.rb)
echo $JWT

First, ensure the Sodium extension is enabled (included by default in PHP 7.2+):

# Ensure the sodium extension is enabled
php -m | grep sodium

Create a new file for JWT generation code:

main.php

<?php
function buildJwt() {
    // Fetching values directly from environment variables
    $keyName = getenv('KEY_NAME');  
    $keySecret = getenv('KEY_SECRET');
    $requestMethod = getenv('REQUEST_METHOD'); 
    $requestHost = getenv('REQUEST_HOST');
    $requestPath = getenv('REQUEST_PATH');

    // Ensure that the environment variables are set
    if (!$keyName || !$keySecret || !$requestMethod || !$requestHost || !$requestPath) {
        throw new Exception('Required environment variables are missing');
    }

    // Decode the Ed25519 private key from base64
    $decoded = base64_decode($keySecret);
    
    // Ed25519 keys are 64 bytes (32 bytes seed + 32 bytes public key)
    if (strlen($decoded) != 64) {
        throw new Exception('Invalid Ed25519 key length');
    }
    
    // Extract the seed (first 32 bytes) - this is the actual private key for sodium
    $privateKey = substr($decoded, 0, 32);
    
    // Constructing the URI from method, host, and path
    $uri = $requestMethod . ' ' . $requestHost . $requestPath;

    // Setting the current time and creating a unique nonce
    $time = time();
    $nonce = substr(str_replace(['+', '/', '='], '', base64_encode(random_bytes(12))), 0, 16);

    // JWT Header
    $header = [
        'alg' => 'EdDSA',
        'typ' => 'JWT',
        'kid' => $keyName,
        'nonce' => $nonce
    ];

    // JWT Payload
    $payload = [
        'sub' => $keyName,
        'iss' => 'cdp',
        'aud' => ['cdp_service'],
        'nbf' => $time,
        'exp' => $time + 120,  // Token valid for 120 seconds from now
        'uri' => $uri
    ];

    // Encode header and payload
    $encodedHeader = rtrim(strtr(base64_encode(json_encode($header)), '+/', '-_'), '=');
    $encodedPayload = rtrim(strtr(base64_encode(json_encode($payload)), '+/', '-_'), '=');
    
    // Create the message to sign
    $message = $encodedHeader . '.' . $encodedPayload;
    
    // Sign with Ed25519 using sodium
    $signature = sodium_crypto_sign_detached($message, $privateKey);
    
    // Encode signature
    $encodedSignature = rtrim(strtr(base64_encode($signature), '+/', '-_'), '=');
    
    // Create the JWT
    return $message . '.' . $encodedSignature;
}

// Example of calling the function to generate the JWT
try {
    $jwt = buildJwt();
    echo $jwt . "\n";
} catch (Exception $e) {
    echo "Error generating JWT: " . $e->getMessage() . "\n";
}

Finally, run the script to generate the JWT output and export it as an environment variable:

export JWT=$(php main.php)
echo $JWT

First, install required dependencies:

<!-- Add this to your pom.xml -->
<dependency>
    <groupId>com.nimbusds</groupId>
    <artifactId>nimbus-jose-jwt</artifactId>
    <version>9.31</version>
</dependency>

Create a new file for JWT generation code:

main.java

import com.nimbusds.jose.*;
import com.nimbusds.jose.crypto.*;
import com.nimbusds.jwt.*;
import java.util.Date;
import java.util.UUID;
import java.util.Base64;

public class Main {
    public static void main(String[] args) throws Exception {
        // Load environment variables
        String keySecret = System.getenv("KEY_SECRET");
        String keyName = System.getenv("KEY_NAME");
        String requestMethod = System.getenv("REQUEST_METHOD");
        String requestHost = System.getenv("REQUEST_HOST");
        String requestPath = System.getenv("REQUEST_PATH");

        // Ensure all environment variables are provided
        if (keySecret == null || keyName == null || requestMethod == null || requestHost == null || requestPath == null) {
            throw new IllegalArgumentException("Required environment variables are missing");
        }

        // Decode the Ed25519 private key from base64
        byte[] decoded = Base64.getDecoder().decode(keySecret);
        
        // Ed25519 keys are 64 bytes (32 bytes seed + 32 bytes public key)
        if (decoded.length != 64) {
            throw new Exception("Invalid Ed25519 key length");
        }
        
        // Extract the seed (first 32 bytes) and public key (last 32 bytes)
        byte[] seed = new byte[32];
        byte[] publicKey = new byte[32];
        System.arraycopy(decoded, 0, seed, 0, 32);
        System.arraycopy(decoded, 32, publicKey, 0, 32);
        
        // Create OctetKeyPair for Ed25519
        OctetKeyPair okp = new OctetKeyPair.Builder(Curve.Ed25519, Base64.getUrlEncoder().withoutPadding().encodeToString(publicKey))
            .d(Base64.getUrlEncoder().withoutPadding().encodeToString(seed))
            .keyUse(KeyUse.SIGNATURE)
            .build();

        // Create URI string for current request
        String uri = requestMethod + " " + requestHost + requestPath;

        // Create JWT claims
        JWTClaimsSet claims = new JWTClaimsSet.Builder()
            .issuer("cdp")
            .subject(keyName)
            .notBeforeTime(new Date())
            .expirationTime(new Date(System.currentTimeMillis() + 120000)) // 120 seconds
            .claim("uri", uri)
            .build();

        // Create JWT header with nonce
        JWSHeader header = new JWSHeader.Builder(JWSAlgorithm.EdDSA)
            .keyID(keyName)
            .customParam("nonce", UUID.randomUUID().toString().replace("-", ""))
            .build();

        // Sign the JWT
        SignedJWT signedJWT = new SignedJWT(header, claims);
        JWSSigner signer = new Ed25519Signer(okp);
        signedJWT.sign(signer);

        String jwt = signedJWT.serialize();
        System.out.println(jwt);
    }
}

Finally, compile the script and export the JWT output as an environment variable:

javac -cp "nimbus-jose-jwt-9.31.jar:." Main.java
export JWT=$(java -cp "nimbus-jose-jwt-9.31.jar:." Main)
echo $JWT

First, install required dependencies:

# For Ubuntu/Debian
sudo apt-get install libsodium-dev nlohmann-json3-dev

# For MacOS
brew install libsodium nlohmann-json

Create a new file for JWT generation code:

main.cpp

#include <iostream>
#include <sstream>
#include <string>
#include <cstdlib>
#include <cstring>
#include <chrono>
#include <random>
#include <sodium.h>
#include <nlohmann/json.hpp>

// Base64 URL encoding helper
std::string base64url_encode(const unsigned char* data, size_t len) {
    static const char* base64_chars = 
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
    
    std::string encoded;
    encoded.reserve(((len + 2) / 3) * 4);
    
    for (size_t i = 0; i < len; i += 3) {
        unsigned int octet1 = data[i];
        unsigned int octet2 = (i + 1 < len) ? data[i + 1] : 0;
        unsigned int octet3 = (i + 2 < len) ? data[i + 2] : 0;
        
        unsigned int combined = (octet1 << 16) | (octet2 << 8) | octet3;
        
        encoded += base64_chars[(combined >> 18) & 0x3F];
        encoded += base64_chars[(combined >> 12) & 0x3F];
        if (i + 1 < len) encoded += base64_chars[(combined >> 6) & 0x3F];
        if (i + 2 < len) encoded += base64_chars[combined & 0x3F];
    }
    
    return encoded;
}

// Base64 decode helper
std::vector<unsigned char> base64_decode(const std::string& encoded) {
    static const unsigned char base64_table[256] = {
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
        64,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
        64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
    };
    
    std::vector<unsigned char> decoded;
    decoded.reserve((encoded.length() * 3) / 4);
    
    for (size_t i = 0; i < encoded.length(); ) {
        unsigned char c1 = base64_table[static_cast<unsigned char>(encoded[i++])];
        unsigned char c2 = base64_table[static_cast<unsigned char>(encoded[i++])];
        unsigned char c3 = (i < encoded.length()) ? base64_table[static_cast<unsigned char>(encoded[i++])] : 64;
        unsigned char c4 = (i < encoded.length()) ? base64_table[static_cast<unsigned char>(encoded[i++])] : 64;
        
        if (c1 == 64 || c2 == 64) break;
        
        decoded.push_back((c1 << 2) | (c2 >> 4));
        if (c3 != 64) decoded.push_back((c2 << 4) | (c3 >> 2));
        if (c4 != 64) decoded.push_back((c3 << 6) | c4);
    }
    
    return decoded;
}

std::string create_jwt() {
    // Initialize libsodium
    if (sodium_init() < 0) {
        throw std::runtime_error("Failed to initialize libsodium");
    }

    // Fetching environment variables
    const char* key_name_env = std::getenv("KEY_NAME");
    const char* key_secret_env = std::getenv("KEY_SECRET");
    const char* request_method_env = std::getenv("REQUEST_METHOD");
    const char* request_host_env = std::getenv("REQUEST_HOST");
    const char* request_path_env = std::getenv("REQUEST_PATH");

    // Ensure all environment variables are present
    if (!key_name_env || !key_secret_env || !request_method_env || !request_host_env || !request_path_env) {
        throw std::runtime_error("Missing required environment variables");
    }

    std::string key_name = key_name_env;
    std::string key_secret = key_secret_env;
    std::string request_method = request_method_env;
    std::string request_host = request_host_env;
    std::string request_path = request_path_env;
    
    // Decode the Ed25519 private key from base64
    std::vector<unsigned char> decoded = base64_decode(key_secret);
    
    // Ed25519 keys are 64 bytes (32 bytes seed + 32 bytes public key)
    if (decoded.size() != 64) {
        throw std::runtime_error("Invalid Ed25519 key length");
    }
    
    // Extract the seed (first 32 bytes)
    unsigned char private_key[32];
    std::memcpy(private_key, decoded.data(), 32);
    
    std::string uri = request_method + " " + request_host + request_path;

    // Generate a random nonce (16 digits)
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(0, 9);
    std::string nonce;
    for (int i = 0; i < 16; ++i) {
        nonce += std::to_string(dis(gen));
    }

    // Get current timestamp
    auto now = std::chrono::system_clock::now();
    auto now_seconds = std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()).count();

    // Create JWT header
    nlohmann::json header = {
        {"alg", "EdDSA"},
        {"typ", "JWT"},
        {"kid", key_name},
        {"nonce", nonce}
    };

    // Create JWT payload
    nlohmann::json payload = {
        {"sub", key_name},
        {"iss", "cdp"},
        {"aud", nlohmann::json::array({"cdp_service"})},
        {"nbf", now_seconds},
        {"exp", now_seconds + 120},
        {"uri", uri}
    };

    // Encode header and payload
    std::string header_json = header.dump();
    std::string payload_json = payload.dump();
    
    std::string encoded_header = base64url_encode(
        reinterpret_cast<const unsigned char*>(header_json.c_str()), 
        header_json.length()
    );
    std::string encoded_payload = base64url_encode(
        reinterpret_cast<const unsigned char*>(payload_json.c_str()), 
        payload_json.length()
    );
    
    // Create message to sign
    std::string message = encoded_header + "." + encoded_payload;
    
    // Sign with Ed25519
    unsigned char signature[crypto_sign_BYTES];
    crypto_sign_detached(signature, nullptr,
        reinterpret_cast<const unsigned char*>(message.c_str()), message.length(),
        private_key);
    
    // Encode signature
    std::string encoded_signature = base64url_encode(signature, crypto_sign_BYTES);
    
    // Return complete JWT
    return message + "." + encoded_signature;
}

int main() {
    try {
        std::string token = create_jwt();
        std::cout << token << std::endl;
    } catch (const std::exception& e) {
        std::cerr << "Error: " << e.what() << std::endl;
        return 1;
    }
    return 0;
}

Finally, compile the script and export the JWT output as an environment variable:

g++ main.cpp -o myapp -lsodium -std=c++17
export JWT=$(./myapp)
echo $JWT

First, install required dependencies:

dotnet add package System.IdentityModel.Tokens.Jwt
dotnet add package BouncyCastle.NetCore
dotnet add package Microsoft.IdentityModel.Tokens
dotnet add package Newtonsoft.Json

Create a new file for JWT generation code:

GenerateBearerJWT.cs

using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using Newtonsoft.Json;

namespace BearerJWT
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Get environment variables
            string keyName = Environment.GetEnvironmentVariable("KEY_NAME");
            string keySecret = Environment.GetEnvironmentVariable("KEY_SECRET");
            string requestMethod = Environment.GetEnvironmentVariable("REQUEST_METHOD");
            string requestHost = Environment.GetEnvironmentVariable("REQUEST_HOST");
            string requestPath = Environment.GetEnvironmentVariable("REQUEST_PATH");

            // Validate environment variables
            if (string.IsNullOrEmpty(keyName) || string.IsNullOrEmpty(keySecret) || 
                string.IsNullOrEmpty(requestMethod) || string.IsNullOrEmpty(requestHost) || 
                string.IsNullOrEmpty(requestPath))
            {
                throw new InvalidOperationException("Missing required environment variables");
            }

            string token = GenerateBearerJWT(keyName, keySecret, requestMethod, requestHost, requestPath);
            Console.WriteLine(token);
        }

        static string GenerateBearerJWT(string keyName, string keySecret, string requestMethod, 
            string requestHost, string requestPath)
        {
            // Decode the Ed25519 private key from base64
            byte[] decoded = Convert.FromBase64String(keySecret);
            
            // Ed25519 keys are 64 bytes (32 bytes seed + 32 bytes public key)
            if (decoded.Length != 64)
            {
                throw new Exception("Invalid Ed25519 key length");
            }
            
            // Extract the seed (first 32 bytes)
            byte[] seed = new byte[32];
            Array.Copy(decoded, 0, seed, 0, 32);
            
            // Create Ed25519 private key parameters
            var privateKey = new Ed25519PrivateKeyParameters(seed, 0);
            
            // Create the URI
            string uri = $"{requestMethod} {requestHost}{requestPath}";

            // Create header
            var header = new Dictionary<string, object>
            {
                { "alg", "EdDSA" },
                { "typ", "JWT" },
                { "kid", keyName },
                { "nonce", GenerateNonce() }
            };

            // Create payload with timing
            var now = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
            var payload = new Dictionary<string, object>
            {
                { "sub", keyName },
                { "iss", "cdp" },
                { "aud", new[] { "cdp_service" } },
                { "nbf", now },
                { "exp", now + 120 }, // 2 minutes expiration
                { "uri", uri }
            };

            // Encode header and payload
            string headerJson = JsonConvert.SerializeObject(header);
            string payloadJson = JsonConvert.SerializeObject(payload);
            
            string encodedHeader = Base64UrlEncode(Encoding.UTF8.GetBytes(headerJson));
            string encodedPayload = Base64UrlEncode(Encoding.UTF8.GetBytes(payloadJson));
            
            string message = $"{encodedHeader}.{encodedPayload}";
            
            // Sign with Ed25519
            var signer = new Ed25519Signer();
            signer.Init(true, privateKey);
            byte[] messageBytes = Encoding.UTF8.GetBytes(message);
            signer.BlockUpdate(messageBytes, 0, messageBytes.Length);
            byte[] signature = signer.GenerateSignature();
            
            string encodedSignature = Base64UrlEncode(signature);
            
            return $"{message}.{encodedSignature}";
        }

        // Method to generate a dynamic nonce
        static string GenerateNonce()
        {
            var random = new Random();
            var nonce = new char[16];
            for (int i = 0; i < 16; i++)
            {
                nonce[i] = (char)('0' + random.Next(10));
            }
            return new string(nonce);
        }

        // Base64 URL encoding without padding
        static string Base64UrlEncode(byte[] input)
        {
            return Convert.ToBase64String(input)
                .Replace("+", "-")
                .Replace("/", "_")
                .Replace("=", "");
        }
    }
}

Finally, build and run the project to generate the JWT output and export it as an environment variable:

dotnet build
export JWT=$(dotnet run)
echo $JWT

Bearer Tokens are valid for 2 minutes by default. After 2 minutes, you will need to generate a new Bearer Token (JWT) to ensure uninterrupted access to the CDP APIs. If you are experiencing issues, please make sure your machine’s clock is accurate.

3. Authenticate

Use our SDK for easier authentication

The CDP SDK automatically handles authentication for you, streamlining the process of making requests to all of our REST endpoints.

To authenticate your server-side code, use the JWT token you generated in the previous step as a Bearer Token within your request:

export API_ENDPOINT="https://$REQUEST_HOST$REQUEST_PATH"

# Now, use that endpoint in your curl command
curl -L -X "$HTTP_METHOD" "$API_ENDPOINT" \
  -H "Authorization: Bearer $JWT" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json"

As an example, Get Asset by ID could be requested like so:

curl -L -X POST "https://api.cdp.coinbase.com/platform/v1/networks/base-mainnet/assets/BTC" \
  -H "Authorization: Bearer ${JWT}" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json"

Wallet Secret

The Wallet Secret is an additional layer of security that’s required for any server-to-server requests that involve sensitive wallet write operations to the EVM and Solana APIs. This key:

Is used to generate a Wallet Token (JWT), which authenticates your wallet ownership
Is used in the X-Wallet-Auth header of your request
Is required for sensitive wallet operations (i.e., POST and DELETE requests), such as signing a transaction
Should be treated like the password to your onchain wallet
Is generated by CDP’s Trusted Execution Environment (TEE)
Is never visible to Coinbase

1. Create Wallet Secret

To create a Wallet Secret:

Navigate to your Wallet API dashboard.
Ensure your desired project is selected from the top drop-down.
In the Wallet Secret section, click the Generate button.
Save the secret in a secure location - you won’t be able to view it again.

Your Wallet Secret is a secret that, when combined with your Secret API Key, can be used to sign transactions and messages. It is generated by CDP’s Trusted Execution Environment (TEE), and is never visible to Coinbase. Secure it as you would a password, and never share it or expose it in client-side code.

2. Generate Wallet Token

Wallet Tokens (Wallet Authentication JWTs) are required for any server-to-server communication that requires a X-Wallet-Auth header, and are generated using your Wallet Secret.

Use our SDK for easier authentication The CDP SDK automatically handles generation of Wallet Authentication JWTs for you, streamlining the process of making requests to all of our REST endpoints.

For REST API users, continue reading to:

Set up your environment for Wallet Authentication JWT generation by configuring environment variables and installing dependencies
Export your generated Wallet Authentication JWT as an environment variable

Environment setup

To begin, export the following environment variables:

# Your Wallet Secret from the CDP Portal
export WALLET_SECRET="your-wallet-secret"

# The endpoint you're calling
export REQUEST_METHOD="POST"
export REQUEST_PATH="/platform/v2/evm/accounts/0x742d35Cc6634C0532925a3b844Bc454e4438f44e/sign/transaction"
export REQUEST_HOST="api.cdp.coinbase.com"

# The exact request body you'll send
export REQUEST_BODY='{"transaction": "0x1234567890123456789012345678901234567890"}'

Complete the remaining setup steps for JWT generation below according to your language choice.

Generate Wallet Token (JWT) and export

First, install required dependencies:

npm install jose crypto

Create a new file to generate your Wallet Token:

generate_wallet_jwt.js

const jose = require('jose');
const crypto = require('crypto');

// Get environment variables
const walletSecret = process.env.WALLET_SECRET;
const requestMethod = process.env.REQUEST_METHOD;
const requestHost = process.env.REQUEST_HOST;
const requestPath = process.env.REQUEST_PATH;
const requestBody = process.env.REQUEST_BODY;

// Create the JWT payload
const now = Math.floor(Date.now() / 1000);
const uri = `${requestMethod} ${requestHost}${requestPath}`;

const payload = {
  iat: now,
  nbf: now,
  jti: crypto.randomBytes(16).toString('hex'),
  uris: [uri]
};

function sortKeys(obj) {
  if (!obj || typeof obj !== "object") {
    return obj;
  }

  if (Array.isArray(obj)) {
    return obj.map(sortKeys);
  }

  return Object.keys(obj)
    .sort()
    .reduce(
      (acc, key) => {
        acc[key] = sortKeys(obj[key]);
        return acc;
      },
      {},
    );
}

// Add request body if present
if (requestBody) {
  const sortedBody = sortKeys(JSON.parse(requestBody));
  payload.reqHash = crypto
    .createHash('sha256')
    .update(Buffer.from(JSON.stringify(sortedBody)))
    .digest('hex');
}

// Generate the JWT
(async () => {
  const ecKey = crypto.createPrivateKey({
    key: walletSecret,
    format: "der",
    type: "pkcs8",
    encoding: "base64",
  });

  // Sign JWT
  const jwt = await new jose.SignJWT(payload)
    .setProtectedHeader({ alg: 'ES256', typ: 'JWT' })
    .sign(ecKey);

  console.log(jwt);
})();

Finally, run the script to generate the JWT output and export it as an environment variable:

# Generate and export the JWT
export WALLET_AUTH_JWT=$(node generate_wallet_jwt.js)
echo $WALLET_AUTH_JWT

First, install required dependencies:

npm install jose crypto

Create a new file to generate your Wallet Token:

generate_wallet_jwt.js

const jose = require('jose');
const crypto = require('crypto');

// Get environment variables
const walletSecret = process.env.WALLET_SECRET;
const requestMethod = process.env.REQUEST_METHOD;
const requestHost = process.env.REQUEST_HOST;
const requestPath = process.env.REQUEST_PATH;
const requestBody = process.env.REQUEST_BODY;

// Create the JWT payload
const now = Math.floor(Date.now() / 1000);
const uri = `${requestMethod} ${requestHost}${requestPath}`;

const payload = {
  iat: now,
  nbf: now,
  jti: crypto.randomBytes(16).toString('hex'),
  uris: [uri]
};

function sortKeys(obj) {
  if (!obj || typeof obj !== "object") {
    return obj;
  }

  if (Array.isArray(obj)) {
    return obj.map(sortKeys);
  }

  return Object.keys(obj)
    .sort()
    .reduce(
      (acc, key) => {
        acc[key] = sortKeys(obj[key]);
        return acc;
      },
      {},
    );
}

// Add request body if present
if (requestBody) {
  const sortedBody = sortKeys(JSON.parse(requestBody));
  payload.reqHash = crypto
    .createHash('sha256')
    .update(Buffer.from(JSON.stringify(sortedBody)))
    .digest('hex');
}

// Generate the JWT
(async () => {
  const ecKey = crypto.createPrivateKey({
    key: walletSecret,
    format: "der",
    type: "pkcs8",
    encoding: "base64",
  });

  // Sign JWT
  const jwt = await new jose.SignJWT(payload)
    .setProtectedHeader({ alg: 'ES256', typ: 'JWT' })
    .sign(ecKey);

  console.log(jwt);
})();

Finally, run the script to generate the JWT output and export it as an environment variable:

# Generate and export the JWT
export WALLET_AUTH_JWT=$(node generate_wallet_jwt.js)
echo $WALLET_AUTH_JWT

First, install required dependencies:

npm install jose crypto typescript @types/node

Configure your TypeScript compiler options

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",           // or ES2015 or higher
    "module": "CommonJS",         // or "ESNext" for ESM
    "moduleResolution": "node",
    "lib": ["ES2020"],            // include at least ES2020
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true
  }
}

Create a new file to generate your Wallet Token:

generate_wallet_jwt.ts

import * as jose from 'jose';
import * as crypto from "crypto";

// Get environment variables
const walletSecret = process.env.WALLET_SECRET!;
const requestMethod = process.env.REQUEST_METHOD!;
const requestHost = process.env.REQUEST_HOST!;
const requestPath = process.env.REQUEST_PATH!;
const requestBody = process.env.REQUEST_BODY;

// Create the JWT payload
const now = Math.floor(Date.now() / 1000);
const uri = `${requestMethod} ${requestHost}${requestPath}`;

const payload: jose.JWTPayload = {
  iat: now,
  nbf: now,
  jti: crypto.randomBytes(16).toString('hex'),
  uris: [uri]
};

function sortKeys(obj: any): any {
  if (!obj || typeof obj !== "object") {
    return obj;
  }

  if (Array.isArray(obj)) {
    return obj.map(sortKeys);
  }

  return Object.keys(obj)
    .sort()
    .reduce(
      (acc, key) => {
        acc[key] = sortKeys(obj[key]);
        return acc;
      },
      {} as Record<string, any>,
    );
}

// Add request body if present
if (requestBody) {
  const sortedBody = sortKeys(JSON.parse(requestBody));
  payload.reqHash = crypto
    .createHash('sha256')
    .update(Buffer.from(JSON.stringify(sortedBody)))
    .digest('hex');
}

// Generate the JWT
(async () => {
  const ecKey = crypto.createPrivateKey({
    key: walletSecret,
    format: "der",
    type: "pkcs8",
    encoding: "base64",
  });

  // Sign JWT
  const jwt = await new jose.SignJWT(payload)
    .setProtectedHeader({ alg: 'ES256', typ: 'JWT' })
    .sign(ecKey);

  console.log(jwt);
})();

Finally, compile and run the script to generate the JWT output and export it as an environment variable:

tsc generate_wallet_jwt.ts
export WALLET_AUTH_JWT=$(npx ts-node generate_wallet_jwt.t)
echo $WALLET_AUTH_JWT

First, install required dependencies:

pip install PyJWT==2.8.0
pip install cryptography==42.0.5

Create a new file to generate your Wallet Token:

generate_wallet_jwt.py

import jwt
import time
import uuid
import os
import json
import hashlib
import base64
from cryptography.hazmat.primitives import serialization

# Get environment variables
wallet_secret = os.getenv('WALLET_SECRET')
request_method = os.getenv('REQUEST_METHOD')
request_host = os.getenv('REQUEST_HOST')
request_path = os.getenv('REQUEST_PATH')
request_body = json.loads(os.getenv('REQUEST_BODY'))

# Create the JWT payload
now = int(time.time())
uri = f"{request_method} {request_host}{request_path}"

payload = {
    'iat': now,
    'nbf': now,
    'jti': str(uuid.uuid4()),
    'uris': [uri]
}

def sort_keys(obj: dict) -> dict:
    if not obj or not isinstance(obj, dict | list):
        return obj

    if isinstance(obj, list):
        return [sort_keys(item) for item in obj]

    return {key: sort_keys(obj[key]) for key in sorted(obj.keys())}

# Add request body if present
if request_body:
    sorted_body = sort_keys(request_body)
    json_bytes = json.dumps(sorted_body, separators=(",", ":"), sort_keys=True).encode("utf-8")
    payload['reqHash'] = hashlib.sha256(json_bytes).hexdigest()

der_bytes = serialization.load_der_private_key(
    base64.b64decode(wallet_secret), password=None
)

token = jwt.encode(
    payload,
    der_bytes,
    algorithm="ES256",
    headers={"typ": "JWT"},
)

print(token)

Finally, run the script to generate the JWT output and export it as an environment variable:

# Generate and export the JWT
export WALLET_AUTH_JWT=$(python generate_wallet_jwt.py)
echo $WALLET_AUTH_JWT

First, install required dependencies:

go mod init wallet-jwt-example
go get github.com/golang-jwt/jwt/v5
go get github.com/sirupsen/logrus

Create a new file to generate your Wallet Token:

generate_wallet_jwt.go

package main

import (
    "crypto/rand"
    "crypto/sha256"
    "crypto/x509"
    "encoding/base64"
    "encoding/json"
    "fmt"
    "os"
    "sort"
    "time"

    "github.com/golang-jwt/jwt/v5"
    log "github.com/sirupsen/logrus"
)

func sortKeys(v interface{}) interface{} {
    switch val := v.(type) {
    case map[string]interface{}:
        sorted := make(map[string]interface{}, len(val))
        keys := make([]string, 0, len(val))
        for k := range val {
            keys = append(keys, k)
        }
        sort.Strings(keys)
        for _, k := range keys {
            sorted[k] = sortKeys(val[k])
        }
        return sorted
    case []interface{}:
        for i, elem := range val {
            val[i] = sortKeys(elem)
        }
        return val
    default:
        return val
    }
}

func generateWalletJWT() (string, error) {
    // Get wallet secret from environment variable
    walletSecret := os.Getenv("WALLET_SECRET")
    if walletSecret == "" {
        return "", fmt.Errorf("WALLET_SECRET environment variable is required")
    }

    derBytes, err := base64.StdEncoding.DecodeString(walletSecret)
    if err != nil {
        return "", fmt.Errorf("failed to base64-decode WALLET_SECRET: %w", err)
    }

    privateKey, err := x509.ParsePKCS8PrivateKey(derBytes)
    if err != nil {
        return "", fmt.Errorf("failed to parse EC private key: %w", err)
    }

    // Get request details from environment variables
    requestMethod := os.Getenv("REQUEST_METHOD")
    requestHost := os.Getenv("REQUEST_HOST")
    requestPath := os.Getenv("REQUEST_PATH")
    requestBody := os.Getenv("REQUEST_BODY")

    uri := fmt.Sprintf("%s %s%s", requestMethod, requestHost, requestPath)

    jti := make([]byte, 16)
    if _, err := rand.Read(jti); err != nil {
        return "", fmt.Errorf("failed to generate JTI: %w", err)
    }

    now := time.Now().Unix()
	claims := jwt.MapClaims{
        "iat":  now,
        "nbf":  now,
        "jti":  fmt.Sprintf("%x", jti),
        "uris": []string{uri},
    }

    // Add request body if present
    if requestBody != "" {
        var body interface{}
        if err := json.Unmarshal([]byte(requestBody), &body); err != nil {
            return "", fmt.Errorf("failed to parse request body: %w", err)
        }

        sorted := sortKeys(body)

        canonicalJSON, err := json.Marshal(sorted)
        if err != nil {
            return "", fmt.Errorf("failed to marshal sorted request body: %w", err)
        }

        hash := sha256.Sum256(canonicalJSON)
        claims["reqHash"] = fmt.Sprintf("%x", hash[:])
    }

    // Create token with claims
    token := jwt.NewWithClaims(jwt.SigningMethodES256, claims)
    token.Header["typ"] = "JWT"
    token.Header["alg"] = "ES256"

    // Sign and serialize the JWT
    jwtString, err := token.SignedString(privateKey)
    if err != nil {
        return "", fmt.Errorf("failed to sign JWT: %w", err)
    }

    return jwtString, nil
}

func main() {
    token, err := generateWalletJWT()
    if err != nil {
        log.Errorf("error generating wallet JWT: %v", err)
        os.Exit(1)
    }
    fmt.Println(token)
}

Run the following to clean up your dependencies:

go mod tidy

Finally, run the script to generate the JWT output and export it as an environment variable:

export WALLET_AUTH_JWT=$(go run generate_wallet_jwt.go)
echo $WALLET_AUTH_JWT

First, install required dependencies:

gem install jwt
gem install openssl

Create a new file to generate your Wallet Token:

generate_wallet_jwt.rb

require 'digest'
require 'jwt'
require 'json'
require 'securerandom'

# Get environment variables
wallet_secret = ENV['WALLET_SECRET']
request_method = ENV['REQUEST_METHOD']
request_host = ENV['REQUEST_HOST']
request_path = ENV['REQUEST_PATH']
request_body = ENV['REQUEST_BODY']

# Create the JWT payload
now = Time.now.to_i
uri = "#{request_method} #{request_host}#{request_path}"

payload = {
  iat: now,
  nbf: now,
  jti: SecureRandom.uuid,
  uris: [uri]
}

def sort_keys(obj)
  case obj
  when Hash
    sorted = obj.keys.sort.each_with_object({}) do |key, result|
      result[key] = sort_keys(obj[key])
    end
    sorted
  when Array
    obj.map { |e| sort_keys(e) }
  else
    obj
  end
end

# Add request body if present
if request_body
  parsed_body = JSON.parse(request_body)
  sorted_body = sort_keys(parsed_body)

  canonical_json = JSON.generate(sorted_body)
  req_hash = Digest::SHA256.hexdigest(canonical_json)

  payload[:reqHash] = req_hash
end

# Generate the JWT
token = JWT.encode(payload, wallet_secret, 'ES256', { typ: 'JWT' })

puts token

Finally, run the script to generate the JWT output and export it as an environment variable:

ruby generate_wallet_jwt.rb
export WALLET_AUTH_JWT=$(ruby generate_wallet_jwt.rb)
echo $WALLET_AUTH_JWT

First, install required dependencies:

composer require firebase/php-jwt

Create a new file to generate your Wallet Token:

generate_wallet_jwt.php

<?php
require 'vendor/autoload.php';
use Firebase\JWT\JWT;

function sortKeys($data) {
    if (is_array($data)) {
        if (array_keys($data) !== range(0, count($data) - 1)) {
            ksort($data);
        }
        foreach ($data as $key => $value) {
            $data[$key] = sortKeys($value);
        }
    }
    return $data;
}

function generateWalletJWT() {
    // Get environment variables
    $walletSecret = getenv('WALLET_SECRET');
    $requestMethod = getenv('REQUEST_METHOD');
    $requestHost = getenv('REQUEST_HOST');
    $requestPath = getenv('REQUEST_PATH');
    $requestBody = getenv('REQUEST_BODY');

    // Ensure required environment variables are set
    if (!$walletSecret || !$requestMethod || !$requestHost || !$requestPath) {
        throw new Exception('Required environment variables are missing');
    }

    // Create the URI
    $uri = $requestMethod . ' ' . $requestHost . $requestPath;

    // Create the JWT payload
    $now = time();
    $payload = [
        'iat' => $now,
        'nbf' => $now,
        'jti' => bin2hex(random_bytes(16)),
        'uris' => [$uri]
    ];

    // Add request body if present
    if ($requestBody) {
        $parsedBody = json_decode($requestBody, true);
        $sortedBody = sortKeys($parsedBody);
        $canonicalJson = json_encode($sortedBody, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        $reqHash = hash('sha256', $canonicalJson);
        $payload['reqHash'] = $reqHash;
    }

    // Generate the JWT
    return JWT::encode($payload, $walletSecret, 'ES256', null, ['typ' => 'JWT']);
}

try {
    $token = generateWalletJWT();
    echo $token;
} catch (Exception $e) {
    echo "Error generating JWT: " . $e->getMessage();
}

Finally, run the script to generate the JWT output and export it as an environment variable:

php generate_wallet_jwt.php
export WALLET_AUTH_JWT=$(php generate_wallet_jwt.php)
echo $WALLET_AUTH_JWT

First, install required dependencies:

<!-- Add these to your pom.xml -->
<dependencies>
    <dependency>
        <groupId>com.nimbusds</groupId>
        <artifactId>nimbus-jose-jwt</artifactId>
        <version>9.31</version>
    </dependency>
    <dependency>
        <groupId>org.bouncycastle</groupId>
        <artifactId>bcprov-jdk15on</artifactId>
        <version>1.70</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.17.0</version>
    </dependency>
</dependencies>

Create a new file to generate your Wallet Token:

GenerateWalletJWT.java

import com.nimbusds.jose.*;
import com.nimbusds.jose.crypto.*;
import com.nimbusds.jwt.*;
import java.security.SecureRandom;
import java.security.MessageDigest;
import java.util.*;
import java.time.Instant;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.Security;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.JsonNode;
import java.nio.charset.StandardCharsets;

public class GenerateWalletJWT {
    public static void main(String[] args) throws Exception {
        // Register BouncyCastle as a security provider
        Security.addProvider(new BouncyCastleProvider());

        // Get environment variables
        String walletSecret = System.getenv("WALLET_SECRET");
        String requestMethod = System.getenv("REQUEST_METHOD");
        String requestHost = System.getenv("REQUEST_HOST");
        String requestPath = System.getenv("REQUEST_PATH");
        String requestBody = System.getenv("REQUEST_BODY");

        // Ensure all environment variables are provided
        if (walletSecret == null || requestMethod == null || requestHost == null || requestPath == null) {
            throw new IllegalArgumentException("Required environment variables are missing");
        }

        // Create header
        JWSHeader header = new JWSHeader.Builder(JWSAlgorithm.ES256)
            .type(JOSEObjectType.JWT)
            .build();

        // Create URI
        String uri = requestMethod + " " + requestHost + requestPath;

        // Create claims
        JWTClaimsSet.Builder claimsBuilder = new JWTClaimsSet.Builder()
            .issueTime(Date.from(Instant.now()))
            .notBeforeTime(Date.from(Instant.now()))
            .jwtID(generateJTI());

        // Add URIs
        claimsBuilder.claim("uris", Collections.singletonList(uri));

        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true);

        // Add request body if present
        if (requestBody != null && !requestBody.isEmpty()) {
            JsonNode parsedBody = mapper.readTree(requestBody);
            JsonNode sortedBody = sortJson(parsedBody);

            // Serialize to canonical JSON
            String canonicalJson = mapper.writeValueAsString(sortedBody);

            // Compute SHA-256 hash
            MessageDigest digest = MessageDigest.getInstance("SHA-256");
            byte[] hashBytes = digest.digest(canonicalJson.getBytes(StandardCharsets.UTF_8));
            StringBuilder sb = new StringBuilder();
            for (byte b : hashBytes) {
                sb.append(String.format("%02x", b));
            }
            String reqHash = sb.toString();

            claimsBuilder.claim("reqHash", reqHash);
        }

        JWTClaimsSet claims = claimsBuilder.build();

        // Create JWT
        SignedJWT signedJWT = new SignedJWT(header, claims);

        // Create signer
        JWSSigner signer = new MACSigner(walletSecret.getBytes());

        // Sign the JWT
        signedJWT.sign(signer);

        // Serialize the JWT
        String jwtString = signedJWT.serialize();
        System.out.println(jwtString);
    }

    private static JsonNode sortJson(JsonNode node) {
        if (node.isObject()) {
            TreeMap<String, JsonNode> sorted = new TreeMap<>();
            node.fields().forEachRemaining(entry ->
                sorted.put(entry.getKey(), sortJson(entry.getValue()))
            );
            ObjectNode sortedNode = new ObjectMapper().createObjectNode();
            sorted.forEach(sortedNode::set);
            return sortedNode;
        } else if (node.isArray()) {
            for (int i = 0; i < node.size(); i++) {
                ((ObjectNode) node).set(String.valueOf(i), sortJson(node.get(i)));
            }
        }
        return node;
    }

    private static String generateJTI() {
        SecureRandom random = new SecureRandom();
        byte[] bytes = new byte[16];
        random.nextBytes(bytes);
        return Base64.getUrlEncoder().withoutPadding().encodeToString(bytes);
    }
}

Finally, compile and run the script to generate the JWT output and export it as an environment variable:

mvn compile
export WALLET_AUTH_JWT=$(mvn exec:java -Dexec.mainClass=GenerateWalletJWT)
echo $WALLET_AUTH_JWT

First, install required dependencies:

# For Ubuntu/Debian
sudo apt-get install libssl-dev libjwt-dev libcurl4-openssl-dev

# For MacOS
brew install openssl jwt-cpp curl

Create a new file to generate your Wallet Token:

generate_wallet_jwt.cpp

#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <random>
#include <jwt-cpp/jwt.h>
#include <nlohmann/json.hpp>
#include "picosha2.h"

nlohmann::json sort_json(const nlohmann::json& j) {
    if (j.is_object()) {
        nlohmann::json result(nlohmann::json::value_t::object);
        std::vector<std::string> keys;
        for (auto it = j.begin(); it != j.end(); ++it) {
            keys.push_back(it.key());
        }
        std::sort(keys.begin(), keys.end());
        for (const auto& key : keys) {
            result[key] = sort_json(j.at(key));
        }
        return result;
    } else if (j.is_array()) {
        nlohmann::json result = nlohmann::json::array();
        for (const auto& el : j) {
            result.push_back(sort_json(el));
        }
        return result;
    } else {
        return j;
    }
}

std::string generateWalletJWT() {
    // Get environment variables
    const char* walletSecret = std::getenv("WALLET_SECRET");
    const char* requestMethod = std::getenv("REQUEST_METHOD");
    const char* requestHost = std::getenv("REQUEST_HOST");
    const char* requestPath = std::getenv("REQUEST_PATH");
    const char* requestBody = std::getenv("REQUEST_BODY");

    // Ensure all environment variables are present
    if (!walletSecret || !requestMethod || !requestHost || !requestPath) {
        throw std::runtime_error("Missing required environment variables");
    }

    std::string uri = std::string(requestMethod) + " " + std::string(requestHost) + std::string(requestPath);

    // Generate a random JTI
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(0, 15);
    std::string jti;
    for (int i = 0; i < 32; i++) {
        jti += "0123456789abcdef"[dis(gen)];
    }

    // Get current time
    auto now = std::chrono::system_clock::now();
    auto now_seconds = std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()).count();

    // Create JWT token
    auto token = jwt::create()
        .set_issued_at(now)
        .set_not_before(now)
        .set_payload_claim("jti", jwt::claim(jti))
        .set_payload_claim("uris", jwt::claim(std::vector<std::string>{uri}));

    // Add request body if present
    if (requestBody) {
        nlohmann::json body = nlohmann::json::parse(requestBody);
        nlohmann::json sortedBody = sort_json(body);
        std::string canonicalJson = sortedBody.dump();
        std::string hash = picosha2::hash256_hex_string(canonicalJson);
        token.set_payload_claim("reqHash", jwt::claim(hash));
    }

    // Sign and get the token
    return token.sign(jwt::algorithm::es256(walletSecret));
}

int main() {
    try {
        std::string token = generateWalletJWT();
        std::cout << token << std::endl;
    } catch (const std::exception& e) {
        std::cerr << "Error: " << e.what() << std::endl;
        return 1;
    }
    return 0;
}

Finally, compile and run the script to generate the JWT output and export it as an environment variable:

g++ generate_wallet_jwt.cpp -o wallet_jwt -lcurlpp -lcurl -lssl -lcrypto -I/usr/local/include -L/usr/local/lib -ljwt -std=c++17
export WALLET_AUTH_JWT=$(./wallet_jwt)
echo $WALLET_AUTH_JWT

First, install required dependencies:

dotnet add package System.IdentityModel.Tokens.Jwt
dotnet add package BouncyCastle.NetCore
dotnet add package Microsoft.IdentityModel.Tokens

Create a new file to generate your Wallet Token:

GenerateWalletJWT.cs

using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Cryptography;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;

namespace WalletJWT
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Get environment variables
            string walletSecret = Environment.GetEnvironmentVariable("WALLET_SECRET");
            string requestMethod = Environment.GetEnvironmentVariable("REQUEST_METHOD");
            string requestHost = Environment.GetEnvironmentVariable("REQUEST_HOST");
            string requestPath = Environment.GetEnvironmentVariable("REQUEST_PATH");
            string requestBody = Environment.GetEnvironmentVariable("REQUEST_BODY");

            // Validate environment variables
            if (string.IsNullOrEmpty(walletSecret) || string.IsNullOrEmpty(requestMethod) ||
                string.IsNullOrEmpty(requestHost) || string.IsNullOrEmpty(requestPath))
            {
                throw new InvalidOperationException("Missing required environment variables");
            }

            string token = GenerateWalletJWT(walletSecret, requestMethod, requestHost, requestPath, requestBody);
            Console.WriteLine(token);
        }

        static string GenerateWalletJWT(string walletSecret, string requestMethod, string requestHost, 
            string requestPath, string requestBody)
        {
            // Create the URI
            string uri = $"{requestMethod} {requestHost}{requestPath}";

            // Create security key
            var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(walletSecret));
            var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

            // Create header
            var header = new JwtHeader(credentials);
            header["typ"] = "JWT";

            // Create payload
            var now = DateTimeOffset.UtcNow;
            var payload = new JwtPayload
            {
                { "iat", now.ToUnixTimeSeconds() },
                { "nbf", now.ToUnixTimeSeconds() },
                { "jti", GenerateJTI() },
                { "uris", new[] { uri } }
            };

            // Add request body if present
            if (!string.IsNullOrEmpty(requestBody))
            {
                JsonNode parsedBody = JsonNode.Parse(requestBody);

                var sorted = SortJson(parsedBody);
                string canonicalJson = sorted.ToJsonString(new JsonSerializerOptions
                {
                    WriteIndented = false
                });

                using var sha256 = SHA256.Create();
                var hashBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(canonicalJson));
                string hashHex = BitConverter.ToString(hashBytes).Replace("-", "").ToLowerInvariant();

                payload["reqHash"] = hashHex;
            }

            // Create and sign the token
            var token = new JwtSecurityToken(header, payload);
            var tokenHandler = new JwtSecurityTokenHandler();
            return tokenHandler.WriteToken(token);
        }

        static JsonNode SortJson(JsonNode node)
        {
            return node switch
            {
                JsonObject obj => new JsonObject(
                    obj.OrderBy(kvp => kvp.Key)
                    .ToDictionary(
                        kvp => kvp.Key,
                        kvp => SortJson(kvp.Value)
                    )
                ),
                JsonArray arr => new JsonArray(arr.Select(SortJson).ToArray()),
                _ => node
            };
        }

        // Method to generate a dynamic nonce
        static string GenerateJTI()
        {
            byte[] randomBytes = new byte[16];
            using (var rng = RandomNumberGenerator.Create())
            {
                rng.GetBytes(randomBytes);
            }
            return Convert.ToBase64String(randomBytes)
                .Replace("+", "-")
                .Replace("/", "_")
                .Replace("=", "");
        }
    }
}

Finally, build and run the project to generate the JWT output and export it as an environment variable:

dotnet build
export WALLET_AUTH_JWT=$(dotnet run)
echo $WALLET_AUTH_JWT

Wallet Tokens are valid for 1 minute. After 1 minute, you will need to generate a new one. If you are experiencing issues, please make sure your machine’s clock is accurate.

The req claim in the wallet JWT is still supported for backwards compatibility with the CDP SDK, but reqHash is now the preferred way to include request body information. The req claim will eventually be deprecated - we recommend using reqHash for all new implementations.

3. Authenticate

Use our SDK for easier authentication The CDP SDK automatically handles authentication for you, streamlining the process of making requests to all of our REST endpoints.

For endpoints that require wallet authentication (marked with the X-Wallet-Auth header requirement), you must include both:

The standard Bearer token in the Authorization header
The Wallet Authentication JWT in the X-Wallet-Auth

For example, to sign a transaction:

# First construct the full API endpoint using our env vars
export API_ENDPOINT="https://${REQUEST_HOST}${REQUEST_PATH}"

# Make the authenticated request using both JWT tokens
curl -L -X ${REQUEST_METHOD} "${API_ENDPOINT}" \
  -H "Authorization: Bearer ${JWT}" \
  -H "X-Wallet-Auth: ${WALLET_AUTH_JWT}" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -d "${REQUEST_BODY}"

This example uses the environment variables we set earlier.

CDP API V2

REST API

API Authentication

Introduction

Client API Key

1. Create Client API Key

2. Authenticate

Secret API Key

1. Create Secret API Key

2. Generate Bearer Token

Environment setup

Generate Bearer Token (JWT) and export

3. Authenticate

Wallet Secret

1. Create Wallet Secret

2. Generate Wallet Token

Environment setup

Generate Wallet Token (JWT) and export

3. Authenticate

What to read next

CDP API V2

REST API

​Introduction

​Client API Key

​1. Create Client API Key

​2. Authenticate

​Secret API Key

​1. Create Secret API Key

​2. Generate Bearer Token

​Environment setup

​Generate Bearer Token (JWT) and export

​3. Authenticate

​Wallet Secret

​1. Create Wallet Secret

​2. Generate Wallet Token

​Environment setup

​Generate Wallet Token (JWT) and export

​3. Authenticate

​What to read next

Introduction

Client API Key

1. Create Client API Key

2. Authenticate

Secret API Key

1. Create Secret API Key

2. Generate Bearer Token

Environment setup

Generate Bearer Token (JWT) and export

3. Authenticate

Wallet Secret

1. Create Wallet Secret

2. Generate Wallet Token

Environment setup

Generate Wallet Token (JWT) and export

3. Authenticate

What to read next