curl --request POST \
  --url https://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mode": "external_owner",
  "ownerAddress": "0x1111111111111111111111111111111111111111",
  "maxTransferAtomic": "1000000",
  "spendLimitAtomic": "1000000",
  "metadata": {}
}
'

import requests

url = "https://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets"

payload = {
    "mode": "external_owner",
    "ownerAddress": "0x1111111111111111111111111111111111111111",
    "maxTransferAtomic": "1000000",
    "spendLimitAtomic": "1000000",
    "metadata": {}
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    mode: 'external_owner',
    ownerAddress: '0x1111111111111111111111111111111111111111',
    maxTransferAtomic: '1000000',
    spendLimitAtomic: '1000000',
    metadata: {}
  })
};

fetch('https://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets', 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://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets",
  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([
    'mode' => 'external_owner',
    'ownerAddress' => '0x1111111111111111111111111111111111111111',
    'maxTransferAtomic' => '1000000',
    'spendLimitAtomic' => '1000000',
    'metadata' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets"

	payload := strings.NewReader("{\n  \"mode\": \"external_owner\",\n  \"ownerAddress\": \"0x1111111111111111111111111111111111111111\",\n  \"maxTransferAtomic\": \"1000000\",\n  \"spendLimitAtomic\": \"1000000\",\n  \"metadata\": {}\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"mode\": \"external_owner\",\n  \"ownerAddress\": \"0x1111111111111111111111111111111111111111\",\n  \"maxTransferAtomic\": \"1000000\",\n  \"spendLimitAtomic\": \"1000000\",\n  \"metadata\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://prod-api.stableyard.fi/v2/accounts/external/{externalUserId}/smart-wallets")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"mode\": \"external_owner\",\n  \"ownerAddress\": \"0x1111111111111111111111111111111111111111\",\n  \"maxTransferAtomic\": \"1000000\",\n  \"spendLimitAtomic\": \"1000000\",\n  \"metadata\": {}\n}"

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

{
  "smartWallet": {
    "id": "resource_123",
    "accountId": "acct_123",
    "environmentId": "environment_123",
    "mode": "external_owner",
    "chainId": 1,
    "status": "example",
    "createdAt": "2026-08-28T10:00:00.000Z",
    "updatedAt": "2026-08-28T10:00:00.000Z"
  },
  "policy": {
    "id": "resource_123",
    "smartWalletId": "smartwallet_123",
    "version": 1,
    "roleKey": "example",
    "executorAddress": "0x1111111111111111111111111111111111111111",
    "tokenAddress": "0x1111111111111111111111111111111111111111",
    "maxTransferAtomic": "1000000",
    "status": "example"
  },
  "setupTransaction": {}
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}

{
  "error": {
    "code": "bad_request",
    "message": "The request is invalid",
    "details": "example"
  }
}