curl --request POST \
  --url https://api.hyperliquid.xyz/exchange \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": {
    "type": "evmUserModify",
    "usingBigBlocks": true
  },
  "nonce": 1705234567890,
  "signature": {
    "r": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "s": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "v": 27
  },
  "vaultAddress": null
}
'

import requests

url = "https://api.hyperliquid.xyz/exchange"

payload = {
    "action": {
        "type": "evmUserModify",
        "usingBigBlocks": True
    },
    "nonce": 1705234567890,
    "signature": {
        "r": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "s": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "v": 27
    },
    "vaultAddress": None
}
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({
    action: {type: 'evmUserModify', usingBigBlocks: true},
    nonce: 1705234567890,
    signature: {
      r: '0x0000000000000000000000000000000000000000000000000000000000000000',
      s: '0x0000000000000000000000000000000000000000000000000000000000000000',
      v: 27
    },
    vaultAddress: null
  })
};

fetch('https://api.hyperliquid.xyz/exchange', 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.hyperliquid.xyz/exchange",
  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([
    'action' => [
        'type' => 'evmUserModify',
        'usingBigBlocks' => true
    ],
    'nonce' => 1705234567890,
    'signature' => [
        'r' => '0x0000000000000000000000000000000000000000000000000000000000000000',
        's' => '0x0000000000000000000000000000000000000000000000000000000000000000',
        'v' => 27
    ],
    'vaultAddress' => null
  ]),
  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.hyperliquid.xyz/exchange"

	payload := strings.NewReader("{\n  \"action\": {\n    \"type\": \"evmUserModify\",\n    \"usingBigBlocks\": true\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"s\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"v\": 27\n  },\n  \"vaultAddress\": null\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.hyperliquid.xyz/exchange")
  .header("Content-Type", "application/json")
  .body("{\n  \"action\": {\n    \"type\": \"evmUserModify\",\n    \"usingBigBlocks\": true\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"s\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"v\": 27\n  },\n  \"vaultAddress\": null\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hyperliquid.xyz/exchange")

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  \"action\": {\n    \"type\": \"evmUserModify\",\n    \"usingBigBlocks\": true\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"s\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n    \"v\": 27\n  },\n  \"vaultAddress\": null\n}"

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

{
  "status": "<string>",
  "response": {}
}