curl --request POST \
  --url https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction \
  --header 'Content-Type: application/json' \
  --data '
{
  "raw_unsigned_txn": "[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080\n[Solana Example]: 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",
  "rpc": {
    "skip_broadcast": false,
    "url": "https://rpc.flashbots.net/fast"
  },
  "evm_params": {
    "disable_dynamic_gas": false,
    "disable_dynamic_nonce": false,
    "replaced_transaction_id": "0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27",
    "chain_id": "1",
    "network_name": "Ethereum"
  }
}
'

import requests

url = "https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction"

payload = {
    "raw_unsigned_txn": "[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080
[Solana Example]: 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",
    "rpc": {
        "skip_broadcast": False,
        "url": "https://rpc.flashbots.net/fast"
    },
    "evm_params": {
        "disable_dynamic_gas": False,
        "disable_dynamic_nonce": False,
        "replaced_transaction_id": "0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27",
        "chain_id": "1",
        "network_name": "Ethereum"
    }
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    raw_unsigned_txn: '[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080\n[Solana Example]: 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',
    rpc: {skip_broadcast: false, url: 'https://rpc.flashbots.net/fast'},
    evm_params: {
      disable_dynamic_gas: false,
      disable_dynamic_nonce: false,
      replaced_transaction_id: '0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27',
      chain_id: '1',
      network_name: 'Ethereum'
    }
  })
};

fetch('https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction', 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.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction",
  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([
    'raw_unsigned_txn' => '[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080
[Solana Example]: 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',
    'rpc' => [
        'skip_broadcast' => false,
        'url' => 'https://rpc.flashbots.net/fast'
    ],
    'evm_params' => [
        'disable_dynamic_gas' => false,
        'disable_dynamic_nonce' => false,
        'replaced_transaction_id' => '0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27',
        'chain_id' => '1',
        'network_name' => 'Ethereum'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "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.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction"

	payload := strings.NewReader("{\n  \"raw_unsigned_txn\": \"[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080\\n[Solana Example]: 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\",\n  \"rpc\": {\n    \"skip_broadcast\": false,\n    \"url\": \"https://rpc.flashbots.net/fast\"\n  },\n  \"evm_params\": {\n    \"disable_dynamic_gas\": false,\n    \"disable_dynamic_nonce\": false,\n    \"replaced_transaction_id\": \"0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27\",\n    \"chain_id\": \"1\",\n    \"network_name\": \"Ethereum\"\n  }\n}")

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

	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.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction")
  .header("Content-Type", "application/json")
  .body("{\n  \"raw_unsigned_txn\": \"[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080\\n[Solana Example]: 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\",\n  \"rpc\": {\n    \"skip_broadcast\": false,\n    \"url\": \"https://rpc.flashbots.net/fast\"\n  },\n  \"evm_params\": {\n    \"disable_dynamic_gas\": false,\n    \"disable_dynamic_nonce\": false,\n    \"replaced_transaction_id\": \"0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27\",\n    \"chain_id\": \"1\",\n    \"network_name\": \"Ethereum\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets/{wallet_id}/onchain_transaction")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"raw_unsigned_txn\": \"[EVM Example]: 02f00180830f424085057db95cdf825208942225166893d26f2064a15cc84f5b897591a7e6938642a13798e59d80c0808080\\n[Solana Example]: 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\",\n  \"rpc\": {\n    \"skip_broadcast\": false,\n    \"url\": \"https://rpc.flashbots.net/fast\"\n  },\n  \"evm_params\": {\n    \"disable_dynamic_gas\": false,\n    \"disable_dynamic_nonce\": false,\n    \"replaced_transaction_id\": \"0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27\",\n    \"chain_id\": \"1\",\n    \"network_name\": \"Ethereum\"\n  }\n}"

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

{
  "transaction_id": "0bf7bf1e-bafa-4d7e-9312-fa0bf3b63f27"
}