curl --request POST \
  --url https://api.gelato.cloud/rpc \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <x-api-key>' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "relayer_sendTransaction",
  "params": {
    "chainId": "137",
    "payment": {
      "type": "sponsored"
    },
    "to": "0x55f3a93f544e01ce4378d25e927d7c493b863bd7",
    "data": "0x29cb0f49...",
    "context": "<string>",
    "authorizationList": [
      {
        "address": "<string>",
        "chainId": 123,
        "nonce": 123,
        "r": "<string>",
        "s": "<string>",
        "yParity": 123
      }
    ]
  }
}
'

import requests

url = "https://api.gelato.cloud/rpc"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "relayer_sendTransaction",
    "params": {
        "chainId": "137",
        "payment": { "type": "sponsored" },
        "to": "0x55f3a93f544e01ce4378d25e927d7c493b863bd7",
        "data": "0x29cb0f49...",
        "context": "<string>",
        "authorizationList": [
            {
                "address": "<string>",
                "chainId": 123,
                "nonce": 123,
                "r": "<string>",
                "s": "<string>",
                "yParity": 123
            }
        ]
    }
}
headers = {
    "X-API-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 1,
    jsonrpc: '2.0',
    method: 'relayer_sendTransaction',
    params: {
      chainId: '137',
      payment: {type: 'sponsored'},
      to: '0x55f3a93f544e01ce4378d25e927d7c493b863bd7',
      data: '0x29cb0f49...',
      context: '<string>',
      authorizationList: [
        {
          address: '<string>',
          chainId: 123,
          nonce: 123,
          r: '<string>',
          s: '<string>',
          yParity: 123
        }
      ]
    }
  })
};

fetch('https://api.gelato.cloud/rpc', 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.gelato.cloud/rpc",
  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([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'relayer_sendTransaction',
    'params' => [
        'chainId' => '137',
        'payment' => [
                'type' => 'sponsored'
        ],
        'to' => '0x55f3a93f544e01ce4378d25e927d7c493b863bd7',
        'data' => '0x29cb0f49...',
        'context' => '<string>',
        'authorizationList' => [
                [
                                'address' => '<string>',
                                'chainId' => 123,
                                'nonce' => 123,
                                'r' => '<string>',
                                's' => '<string>',
                                'yParity' => 123
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <x-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.gelato.cloud/rpc"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"relayer_sendTransaction\",\n  \"params\": {\n    \"chainId\": \"137\",\n    \"payment\": {\n      \"type\": \"sponsored\"\n    },\n    \"to\": \"0x55f3a93f544e01ce4378d25e927d7c493b863bd7\",\n    \"data\": \"0x29cb0f49...\",\n    \"context\": \"<string>\",\n    \"authorizationList\": [\n      {\n        \"address\": \"<string>\",\n        \"chainId\": 123,\n        \"nonce\": 123,\n        \"r\": \"<string>\",\n        \"s\": \"<string>\",\n        \"yParity\": 123\n      }\n    ]\n  }\n}")

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

	req.Header.Add("X-API-Key", "<x-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.gelato.cloud/rpc")
  .header("X-API-Key", "<x-api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"relayer_sendTransaction\",\n  \"params\": {\n    \"chainId\": \"137\",\n    \"payment\": {\n      \"type\": \"sponsored\"\n    },\n    \"to\": \"0x55f3a93f544e01ce4378d25e927d7c493b863bd7\",\n    \"data\": \"0x29cb0f49...\",\n    \"context\": \"<string>\",\n    \"authorizationList\": [\n      {\n        \"address\": \"<string>\",\n        \"chainId\": 123,\n        \"nonce\": 123,\n        \"r\": \"<string>\",\n        \"s\": \"<string>\",\n        \"yParity\": 123\n      }\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gelato.cloud/rpc")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<x-api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"relayer_sendTransaction\",\n  \"params\": {\n    \"chainId\": \"137\",\n    \"payment\": {\n      \"type\": \"sponsored\"\n    },\n    \"to\": \"0x55f3a93f544e01ce4378d25e927d7c493b863bd7\",\n    \"data\": \"0x29cb0f49...\",\n    \"context\": \"<string>\",\n    \"authorizationList\": [\n      {\n        \"address\": \"<string>\",\n        \"chainId\": 123,\n        \"nonce\": 123,\n        \"r\": \"<string>\",\n        \"s\": \"<string>\",\n        \"yParity\": 123\n      }\n    ]\n  }\n}"

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

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "0x0e670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}

{
  "jsonrpc": "2.0",
  "id": 123,
  "error": {
    "code": 123,
    "message": "<string>"
  }
}

{
  "jsonrpc": "2.0",
  "id": 123,
  "error": {
    "code": 123,
    "message": "<string>"
  }
}