curl --request POST \
  --url https://hip4-api.totalis.trade/v1/auth/wallet-challenges \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "address": "0x1111111111111111111111111111111111111111",
  "origin": "https://app.partner.example"
}
'

import requests

url = "https://hip4-api.totalis.trade/v1/auth/wallet-challenges"

payload = {
    "address": "0x1111111111111111111111111111111111111111",
    "origin": "https://app.partner.example"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Idempotency-Key': '<idempotency-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    address: '0x1111111111111111111111111111111111111111',
    origin: 'https://app.partner.example'
  })
};

fetch('https://hip4-api.totalis.trade/v1/auth/wallet-challenges', 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://hip4-api.totalis.trade/v1/auth/wallet-challenges",
  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([
    'address' => '0x1111111111111111111111111111111111111111',
    'origin' => 'https://app.partner.example'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-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://hip4-api.totalis.trade/v1/auth/wallet-challenges"

	payload := strings.NewReader("{\n  \"address\": \"0x1111111111111111111111111111111111111111\",\n  \"origin\": \"https://app.partner.example\"\n}")

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

	req.Header.Add("Idempotency-Key", "<idempotency-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://hip4-api.totalis.trade/v1/auth/wallet-challenges")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"address\": \"0x1111111111111111111111111111111111111111\",\n  \"origin\": \"https://app.partner.example\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://hip4-api.totalis.trade/v1/auth/wallet-challenges")

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

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"address\": \"0x1111111111111111111111111111111111111111\",\n  \"origin\": \"https://app.partner.example\"\n}"

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

{
  "challenge_id": "0199a1b2-c3d4-7e5f-8a6b-7c8d9e0f1a2b",
  "message": "app.partner.example wants you to sign in with your Ethereum account:\n0x1111111111111111111111111111111111111111\n\nCreate a Totalis venue transport session. This does not authorize a financial action.\n\nURI: https://app.partner.example\nVersion: 1\nChain ID: 999\nNonce: 8d3f2a1c9b7e4f608d3f2a1c9b7e4f608d3f2a1c9b7e4f608d3f2a1c9b7e4f60\nIssued At: 2026-10-16T12:00:00Z\nExpiration Time: 2026-10-16T12:05:00Z\nRequest ID: 0199a1b2-c3d4-7e5f-8a6b-7c8d9e0f1a2c",
  "issued_at": "2026-10-16T12:00:00Z",
  "expires_at": "2026-10-16T12:05:00Z"
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "field_violations": [
      {
        "code": "REQUIRED",
        "field": "<string>"
      }
    ],
    "message": "<string>",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "retry": "NEVER"
  }
}