twilio-verify-send-otp
Overview
Use Twilio Verify to manage the full OTP lifecycle: code generation, delivery, expiry, rate limiting, and Fraud Guard protection. Use the Programmable Messaging API to build your own OTP message infrastructure and access features such as SMS Pumping Protection.
| Twilio Verify | Programmable Messaging API | |
|---|---|---|
| Code generation + expiry | Built-in (10min default, configurable). Also supports custom codes. | Build yourself |
| Rate limiting | Built-in (per-phone, per-service) | Build yourself |
| Fraud protection | Fraud Guard (geo-permissions, rate anomaly) | SMS Pumping Protection |
| A2P registration | Exempt — no 10DLC needed | Required — must register campaign |
| Multi-channel | One API, change channel param (SMS/Voice/Email/WhatsApp) |
Separate integration per channel |
| Cost | Per confirmed verification + channel fee | Per-message pricing + build cost |
| Delivery confirmation | Yes — via List Attempts or Events API | Yes (via StatusCallback) |
When Programmable Messaging is justified: You need full control over message content, custom delivery logic, or SMS Pumping Protection features. For standard OTP/2FA flows, use Verify.
Verify supports SMS, voice, email, and WhatsApp — only the channel parameter changes per delivery method. RCS is not a channel value: Verify automatically upgrades an sms verification to RCS where the device supports it and falls back to SMS. TOTP (authenticator apps) is supported via the Verify Factors API, a separate implementation from channel-based OTP.