curl --request POST \
  --url https://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "sender": "<string>",
  "offer": {
    "policyId1assetName1": "123",
    "policyId2assetName2": "456",
    "policyId3assetName3": "789"
  },
  "toBuy": {
    "policyId1assetName1": "123",
    "policyId2assetName2": "456",
    "policyId3assetName3": "789"
  }
}
'

import requests

url = "https://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer"

payload = {
    "sender": "<string>",
    "offer": {
        "policyId1assetName1": "123",
        "policyId2assetName2": "456",
        "policyId3assetName3": "789"
    },
    "toBuy": {
        "policyId1assetName1": "123",
        "policyId2assetName2": "456",
        "policyId3assetName3": "789"
    }
}
headers = {
    "api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sender: '<string>',
    offer: {
      policyId1assetName1: '123',
      policyId2assetName2: '456',
      policyId3assetName3: '789'
    },
    toBuy: {
      policyId1assetName1: '123',
      policyId2assetName2: '456',
      policyId3assetName3: '789'
    }
  })
};

fetch('https://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer', 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://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer",
  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([
    'sender' => '<string>',
    'offer' => [
        'policyId1assetName1' => '123',
        'policyId2assetName2' => '456',
        'policyId3assetName3' => '789'
    ],
    'toBuy' => [
        'policyId1assetName1' => '123',
        'policyId2assetName2' => '456',
        'policyId3assetName3' => '789'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "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://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer"

	payload := strings.NewReader("{\n  \"sender\": \"<string>\",\n  \"offer\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  },\n  \"toBuy\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  }\n}")

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

	req.Header.Add("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://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer")
  .header("api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sender\": \"<string>\",\n  \"offer\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  },\n  \"toBuy\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://mainnet.gomaestro-api.org/v1/contracts/directSwap/createOffer")

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

request = Net::HTTP::Post.new(url)
request["api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sender\": \"<string>\",\n  \"offer\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  },\n  \"toBuy\": {\n    \"policyId1assetName1\": \"123\",\n    \"policyId2assetName2\": \"456\",\n    \"policyId3assetName3\": \"789\"\n  }\n}"

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

{
  "cbor_hex": "<string>",
  "tx_hash": "<string>"
}