Verify & OTP
Verify users with one-time passcodes over SMS, voice, and WhatsApp. Managed code generation, retries, and fraud controls through one turnkey API.
- <5s
- code delivery
- 190+
- countries
- 99.9%
- verify success
curl -X POST https://api.conversa.in/v1/verify/start \
-H "Authorization: Bearer $API_KEY" \
-d to="+919000000000" \
-d channel="sms" \
-d locale="en"Everything you need to ship Verify & OTP
Managed codes
We generate, send, and validate passcodes — no code storage on your side.
Multi-channel fallback
Auto-retry over voice or WhatsApp when an SMS is not delivered.
Fraud protection
Built-in velocity limits and geo controls block SMS pumping abuse.
Auto-expiry
Configurable code lifetimes and attempt caps enforced server-side.
Built for how you use Verify & OTP
- Login 2FA
- Signup verification
- Transaction approval
- Password resets
SLA
99.9%
verify success
Enterprise-grade reliability with 24/7 support, dedicated routing, and transparent status reporting.
Common questions
Do I store the codes?
No — Conversa generates and validates codes for you via the check endpoint.
What if SMS fails?
Configure automatic fallback to voice or WhatsApp so users still receive their code.
More SMS products
Every Conversa product shares the same API, dashboard, and billing.
Ready to launch Verify & OTP?
Get API keys in minutes. Pay only for what you use.