curl --request POST \
  --url https://api.platform.bitnob.com/wallets/{id}/sign \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "payload": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "address_id": "3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c",
  "hash_function": "no_op",
  "payload_encoding": "hexadecimal"
}
'

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    'X-API-Key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    payload: '9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08',
    address_id: '3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c',
    hash_function: 'no_op',
    payload_encoding: 'hexadecimal'
  })
};

fetch('https://api.platform.bitnob.com/wallets/{id}/sign', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.platform.bitnob.com/wallets/{id}/sign"

payload = {
    "payload": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
    "address_id": "3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c",
    "hash_function": "no_op",
    "payload_encoding": "hexadecimal"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.platform.bitnob.com/wallets/{id}/sign",
  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([
    'payload' => '9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08',
    'address_id' => '3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c',
    'hash_function' => 'no_op',
    'payload_encoding' => 'hexadecimal'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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.platform.bitnob.com/wallets/{id}/sign"

	payload := strings.NewReader("{\n  \"payload\": \"9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08\",\n  \"address_id\": \"3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c\",\n  \"hash_function\": \"no_op\",\n  \"payload_encoding\": \"hexadecimal\"\n}")

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

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("X-API-Key", "<api-key>")
	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.platform.bitnob.com/wallets/{id}/sign")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"payload\": \"9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08\",\n  \"address_id\": \"3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c\",\n  \"hash_function\": \"no_op\",\n  \"payload_encoding\": \"hexadecimal\"\n}")
  .asString();

{
  "activity_id": "activity-id",
  "address": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "address_id": "3f1a2b3c-4d5e-6f7a-8b9c-0d1e2f3a4b5c",
  "algorithm": "ecdsa",
  "chain": "ethereum",
  "curve": "secp256k1",
  "hash_function": "no_op",
  "network": "mainnet",
  "object": "signature",
  "payload": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "payload_encoding": "hexadecimal",
  "r": "0x1",
  "recovery_id": 0,
  "s": "0x2",
  "signature": "0x...",
  "signature_encoding": "hexadecimal",
  "signature_format": "secp256k1_recoverable_65",
  "signed_at": "2026-05-16T10:30:00Z",
  "signed_payload": "0x9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "signed_payload_encoding": "hexadecimal",
  "v": 27,
  "wallet_id": "a1b2c3d4-5e6f-7a8b-9c0d-1e2f3a4b5c6d"
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "details": {},
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>",
    "type": "<string>"
  }
}