Every product team eventually needs phone verification — for signup, login, payments, or fraud prevention. The question isn't whether to verify phone numbers, but whether to build SMS delivery yourself or use an OTP API.
The hidden cost of DIY SMS
- Carrier agreements and routing across 190+ countries
- Code generation, expiry, retry logic, and brute-force protection
- Compliance: log retention, PII masking, and audit trails
- Monitoring delivery rates and handling operator-specific failures
What an OTP API gives you
| Capability | DIY SMS | OTP API |
|---|---|---|
| Time to production | Weeks–months | Hours |
| Fraud protection | Build yourself | Built-in rate limits & blocklists |
| Pricing model | Per SMS sent | Per successful verification |
| Global coverage | Per-country setup | 190+ countries out of the box |
When to use an OTP API
If verification is a feature — not your core product — an OTP-as-a-Service platform lets you ship faster, pay only for successes, and inherit fraud controls that would take a dedicated team to maintain.
DoneOTP offers a drop-in widget and two-endpoint REST API. No platform fee — integrate in an afternoon and scale to millions of verifications.