WhaOTP is a developer-first WhatsApp OTP tool that replaces expensive SMS gateways with WhatsApp's number matching system. Send 4-digit verification codes via WhatsApp and verify users with 2 simple HTTP requests. Users reply with the code, your app gets instant verification. ⚡ 2 API endpoints (send + verify) 🛡️ 3 attempts & 300s expiry 🌍 Works with any WhatsApp number globally 💰 Completely free to use 📦 Code examples: cURL, Python, Node.js, PHP, Go