curl --request POST \
  --url https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "signer": "passkey:cWtP7gmZbd98HbKUuGXx5Q",
  "approver": "passkey:cWtP7gmZbd98HbKUuGXx5Q",
  "deployImmediately": true,
  "expiresAt": "2023-11-07T05:31:56Z",
  "scopes": {
    "spendingLimit": {
      "amount": "10",
      "interval": 86400
    },
    "tokenLocator": "base-sepolia:usdc",
    "type": "transfer"
  }
}
'

import requests

url = "https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers"

payload = {
    "signer": "passkey:cWtP7gmZbd98HbKUuGXx5Q",
    "approver": "passkey:cWtP7gmZbd98HbKUuGXx5Q",
    "deployImmediately": True,
    "expiresAt": "2023-11-07T05:31:56Z",
    "scopes": {
        "spendingLimit": {
            "amount": "10",
            "interval": 86400
        },
        "tokenLocator": "base-sepolia:usdc",
        "type": "transfer"
    }
}
headers = {
    "X-API-KEY": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    signer: 'passkey:cWtP7gmZbd98HbKUuGXx5Q',
    approver: 'passkey:cWtP7gmZbd98HbKUuGXx5Q',
    deployImmediately: true,
    expiresAt: '2023-11-07T05:31:56Z',
    scopes: {
      spendingLimit: {amount: '10', interval: 86400},
      tokenLocator: 'base-sepolia:usdc',
      type: 'transfer'
    }
  })
};

fetch('https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers', 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://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers",
  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([
    'signer' => 'passkey:cWtP7gmZbd98HbKUuGXx5Q',
    'approver' => 'passkey:cWtP7gmZbd98HbKUuGXx5Q',
    'deployImmediately' => true,
    'expiresAt' => '2023-11-07T05:31:56Z',
    'scopes' => [
        'spendingLimit' => [
                'amount' => '10',
                'interval' => 86400
        ],
        'tokenLocator' => 'base-sepolia:usdc',
        'type' => 'transfer'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <x-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://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers"

	payload := strings.NewReader("{\n  \"signer\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"approver\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"deployImmediately\": true,\n  \"expiresAt\": \"2023-11-07T05:31:56Z\",\n  \"scopes\": {\n    \"spendingLimit\": {\n      \"amount\": \"10\",\n      \"interval\": 86400\n    },\n    \"tokenLocator\": \"base-sepolia:usdc\",\n    \"type\": \"transfer\"\n  }\n}")

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

	req.Header.Add("X-API-KEY", "<x-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://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers")
  .header("X-API-KEY", "<x-api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"signer\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"approver\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"deployImmediately\": true,\n  \"expiresAt\": \"2023-11-07T05:31:56Z\",\n  \"scopes\": {\n    \"spendingLimit\": {\n      \"amount\": \"10\",\n      \"interval\": 86400\n    },\n    \"tokenLocator\": \"base-sepolia:usdc\",\n    \"type\": \"transfer\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/signers")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<x-api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"signer\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"approver\": \"passkey:cWtP7gmZbd98HbKUuGXx5Q\",\n  \"deployImmediately\": true,\n  \"expiresAt\": \"2023-11-07T05:31:56Z\",\n  \"scopes\": {\n    \"spendingLimit\": {\n      \"amount\": \"10\",\n      \"interval\": 86400\n    },\n    \"tokenLocator\": \"base-sepolia:usdc\",\n    \"type\": \"transfer\"\n  }\n}"

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

{
  "address": "<string>",
  "locator": "<string>",
  "type": "api-key",
  "chains": {},
  "expiresAt": 123,
  "scopes": {
    "spendingLimit": {
      "amount": "10",
      "interval": 86400
    },
    "tokenLocator": "base-sepolia:usdc",
    "type": "transfer"
  }
}

{
  "error": true,
  "message": "<error message>",
  "code": "DEVICE_SIGNER_NOT_SUPPORTED"
}

{
  "error": true,
  "message": "<error message>",
  "code": "DEVICE_SIGNER_NOT_SUPPORTED"
}