curl -X POST https://api.relayer.fi/v1/action/builders/swap \
  -H "Authorization: ApiKey $RELAYER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tokenIn":  "0xA0b86a33...",
    "tokenOut": "0xC02aaA39...",
    "chain":    "base",
    "title":    "Swap USDC → WETH"
  }'

const response = await fetch("https://api.relayer.fi/v1/action/builders/swap", {
  method: "POST",
  headers: {
    Authorization: `ApiKey ${process.env.RELAYER_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    tokenIn:  "0xA0b86a33...",
    tokenOut: "0xC02aaA39...",
    chain:    "base",
    title:    "Swap USDC → WETH",
  }),
});
const { data } = await response.json();
// data — canonical swap widget metadata. Use the widget metadata URL
// in your frontend's <Widget url=... /> component.

import requests

url = "https://testnet.relayer.fi/v1/action/builders/swap"

payload = {
    "protocol": "lfj",
    "chainName": "avalanche",
    "fromToken": "AVAX",
    "toToken": "JOE",
    "routerAddress": "0xb00D916688FEE4aB6646994104E1441446947fc9",
    "slippageTolerance": 0.5
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    protocol: 'lfj',
    chainName: 'avalanche',
    fromToken: 'AVAX',
    toToken: 'JOE',
    routerAddress: '0xb00D916688FEE4aB6646994104E1441446947fc9',
    slippageTolerance: 0.5
  })
};

fetch('https://testnet.relayer.fi/v1/action/builders/swap', 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://testnet.relayer.fi/v1/action/builders/swap",
  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([
    'protocol' => 'lfj',
    'chainName' => 'avalanche',
    'fromToken' => 'AVAX',
    'toToken' => 'JOE',
    'routerAddress' => '0xb00D916688FEE4aB6646994104E1441446947fc9',
    'slippageTolerance' => 0.5
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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://testnet.relayer.fi/v1/action/builders/swap"

	payload := strings.NewReader("{\n  \"protocol\": \"lfj\",\n  \"chainName\": \"avalanche\",\n  \"fromToken\": \"AVAX\",\n  \"toToken\": \"JOE\",\n  \"routerAddress\": \"0xb00D916688FEE4aB6646994104E1441446947fc9\",\n  \"slippageTolerance\": 0.5\n}")

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

	req.Header.Add("Authorization", "<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://testnet.relayer.fi/v1/action/builders/swap")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"protocol\": \"lfj\",\n  \"chainName\": \"avalanche\",\n  \"fromToken\": \"AVAX\",\n  \"toToken\": \"JOE\",\n  \"routerAddress\": \"0xb00D916688FEE4aB6646994104E1441446947fc9\",\n  \"slippageTolerance\": 0.5\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://testnet.relayer.fi/v1/action/builders/swap")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"protocol\": \"lfj\",\n  \"chainName\": \"avalanche\",\n  \"fromToken\": \"AVAX\",\n  \"toToken\": \"JOE\",\n  \"routerAddress\": \"0xb00D916688FEE4aB6646994104E1441446947fc9\",\n  \"slippageTolerance\": 0.5\n}"

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

{
  "success": true,
  "metadata": {}
}

{
  "statusCode": 400,
  "message": [
    "<string>"
  ],
  "error": "Bad Request"
}

{
  "success": true,
  "message": "<string>",
  "statusCode": 123,
  "timestamp": "<string>",
  "data": {},
  "path": "<string>",
  "traceId": "<string>"
}

{
  "success": true,
  "message": "<string>",
  "statusCode": 123,
  "timestamp": "<string>",
  "data": {},
  "path": "<string>",
  "traceId": "<string>"
}

{
  "success": true,
  "message": "<string>",
  "statusCode": 123,
  "timestamp": "<string>",
  "data": {},
  "path": "<string>",
  "traceId": "<string>"
}