curl --request POST \
  --url https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "userId": "+12055555555",
  "userIdType": "phone_number",
  "fields": {
    "ssnLast4": "5678",
    "dateOfBirth": {
      "day": "15",
      "month": "08",
      "year": "1990"
    }
  }
}
'

import requests

url = "https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade"

payload = {
    "userId": "+12055555555",
    "userIdType": "phone_number",
    "fields": {
        "ssnLast4": "5678",
        "dateOfBirth": {
            "day": "15",
            "month": "08",
            "year": "1990"
        }
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    userId: '+12055555555',
    userIdType: 'phone_number',
    fields: {ssnLast4: '5678', dateOfBirth: {day: '15', month: '08', year: '1990'}}
  })
};

fetch('https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'userId' => '+12055555555',
    'userIdType' => 'phone_number',
    'fields' => [
        'ssnLast4' => '5678',
        'dateOfBirth' => [
                'day' => '15',
                'month' => '08',
                'year' => '1990'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade"

	payload := strings.NewReader("{\n  \"userId\": \"+12055555555\",\n  \"userIdType\": \"phone_number\",\n  \"fields\": {\n    \"ssnLast4\": \"5678\",\n    \"dateOfBirth\": {\n      \"day\": \"15\",\n      \"month\": \"08\",\n      \"year\": \"1990\"\n    }\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"userId\": \"+12055555555\",\n  \"userIdType\": \"phone_number\",\n  \"fields\": {\n    \"ssnLast4\": \"5678\",\n    \"dateOfBirth\": {\n      \"day\": \"15\",\n      \"month\": \"08\",\n      \"year\": \"1990\"\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.cdp.coinbase.com/platform/v2/onramp/limits/upgrade")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"userId\": \"+12055555555\",\n  \"userIdType\": \"phone_number\",\n  \"fields\": {\n    \"ssnLast4\": \"5678\",\n    \"dateOfBirth\": {\n      \"day\": \"15\",\n      \"month\": \"08\",\n      \"year\": \"1990\"\n    }\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "upgradeUrl": "https://pay.coinbase.com/v2/api-onramp/upgrade-limits?sessionToken=MWYwNWQwODktZTZlYy02OTdlLTgzZTYtMTI3NzcyOWJhNjM3",
  "expiresAt": "2026-06-21T00:05:00Z"
}

{
  "errorType": "invalid_request",
  "errorMessage": "Invalid user identifier or fields."
}

{
  "errorType": "unauthorized",
  "errorMessage": "The request is not properly authenticated."
}

{
  "errorType": "rate_limit_exceeded",
  "errorMessage": "Rate limit exceeded."
}

{
  "errorType": "internal_server_error",
  "errorMessage": "An internal server error occurred. Please try again later."
}