SMS Captcha Installation

Eliminate Spam with our SMS Captcha which protects your website from automatic submissions and fake users.

Protect your website - add our captcha to your website in seconds!

After adding our plug and play code, your website will be protected by verifying the mobile device of all users before submissions on your website.

Step 1 - Add Our .JS File

Add our JS file right before the closing </head> tag of your website.

Make that you set the YOUR_API_KEY found in your dashboard. Your API key is built into your JS file include. Login to find your API key and JS file.

Step 2 - Add Captcha to Your Forms

Add our HTML DIV anywhere you want the captcha to appear - before the closing </form> tag you want to protect.

<form action="" method="POST">
  <div id="smsarc_verify_embed"></div>
  <br/>
  <input type="submit" value="Submit">
</form>

Step 3 - Server Side Validation Response

Check our server to see if the captcha was answers successfully. This validation code is added to your existing form handling logic. Make that you set your SMS_Captcha_Secret found in your dashboard.

//STEP 1: Get Value
$SMS_Captcha = $_POST['smsarc-verify'];
if($SMS_Captcha == '') { throw new Exception('Please verify you are not a robot!'); }
//STEP 2: Get Response
$SMS_Captcha_Secret = 'YOUR_API_KEY_HERE'; //keep this a secret; do not make it public; https://smsarc.com/ui/captchas/ 
$SMS_Captcha_Response = file_get_contents("https://smsarc.com/embed/captcha/verify/?secret=".$SMS_Captcha_Secret."&response=".$SMS_Captcha."&remoteip=".$_SERVER['REMOTE_ADDR']);

//STEP 3: Verify Response
if($SMS_Captcha_Response != 'success')
{
	echo 'Invalid response while verifying you are not a robot!'; exit;
}

SMS Arc will continue to verify all valid captcha submissions for an extended duration before eventually expiring. You can verify a response more than once if required.

SMS Captcha FAQ

If you have questions before you begin, take a look at some of the frequent SMS Captcha questions to help you get started.