Most Popular Channel
WhatsApp Verification
Verify phone numbers instantly through WhatsApp. 2 billion+ users worldwide, lower costs than SMS OTP, superior user experience.
How It Works
Seamless verification through the world's most popular messaging app
Step 1
Create Request
Call our API with the phone number. We return a unique 6-character challenge code and WhatsApp deep link.
Step 2
User Opens WhatsApp
User clicks the link or scans QR code. WhatsApp opens with pre-filled message containing the challenge code.
Step 3
Instant Verification
User sends the message. We verify and return a proof token via webhook within seconds.
API Integration
Simple API, powerful verification
1. Create Verification Request
curl -X POST https://api.proof.holdings/api/v1/verifications \
-H "Authorization: Bearer pk_live_YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"type": "phone",
"channel": "whatsapp",
"identifier": "+37069199199"
}'2. Verify the Proof Token
# Poll verification status (user sends message via WhatsApp)
curl -X GET https://api.proof.holdings/api/v1/verifications/VERIFICATION_ID \
-H "Authorization: Bearer pk_live_YOUR_API_KEY"Response Example
{
"id": "507f1f77bcf86cd799439011",
"type": "phone",
"channel": "whatsapp",
"status": "pending",
"identifier": "+37069199199",
"challenge": {
"code": "X7K9M2",
"deep_link": "https://wa.me/14155238886?text=X7K9M2",
"qr_code": "data:image/png;base64,...",
"expires_at": "2026-03-15T10:45:00Z"
}
}