Phone Verification API — Fast, Affordable, Global
DoneOTP is an OTP-as-a-Service platform — verify phone numbers via a drop-in widget or REST API. No platform fee; you only pay for successful verifications.
Verify users, prevent fraud
Delivery, developer experience, security and compliance — built in on every plan.
Global delivery
600+ operators, 190+ countries and <3s average delivery on our own backbone — with dedicated transactional routes.
Turnkey OTP API
Two endpoints, clear docs and a signed result token. Ship SMS verification in an afternoon.
Drop-in widget
Embed a ready-made, brandable UI with a single script tag. We run the whole flow.
Fraud protection
Rate limiting, brute-force lockout, auto-blacklist and country allowlist stop SMS-pumping and abuse.
Regulations compliance
Phone & IP masked at the write layer, configurable log retention and hashed API keys.
Insights & reporting
Client & admin dashboards, live logs and CSV export — full visibility into every verification.
DoneOTP vs Twilio vs Vonage
Compare OTP API pricing and features — no platform fee, pay only for successful verifications.
| Feature | DoneOTP | Twilio Verify | Vonage |
|---|---|---|---|
| Platform fee | None | Per account | Per account |
| Pay per successful verification | ✓ | ✓ | ✓ |
| Drop-in widget | ✓ | ✓ | — |
| Two-endpoint REST API | ✓ | ✓ | ✓ |
| 190+ countries | ✓ | ✓ | ✓ |
| SMS pumping protection | ✓ | Add-on | Limited |
| No telecom expertise needed | ✓ | — | — |
| Starting US rate | $0.0085 | ~$0.05 | ~$0.04 |
Rates are indicative per successful verification. Twilio and Vonage pricing varies by volume and region.
Phone verification integrations
Go live in an afternoon — a drop-in widget or a two-endpoint REST API. No telecom expertise required.
Drop-in widget
Embed a secure, pre-built UI with one script tag. We handle input, code entry, resend and lockout — branded to match your app.
Widget integration guide →REST API
Build your own UI and call us from your backend. Two endpoints, secret key stays server-side, signed result token.
OTP API reference →SMS OTP pricing
Pay only for successful verifications. The base rate below is the starting point — final price depends on the destination country.
- No platform fee
- Failed sends are never charged
- All features included
- Drop-in widget + REST API
- Volume discounts
- Dedicated transactional routes
- 99.99% SLA
- Dedicated support & onboarding
All prices are per successful verification. Failed sends are refunded automatically. Prices vary by country — see SMS OTP pricing by country.
How it works
Three steps from signup to verified users — widget or REST API.
Get API keys
Sign up free and copy your public key (widget) and secret key (backend) from the dashboard.
Integrate
Embed the drop-in widget with one script tag, or call POST /v1/verify/send and /check from your server.
Verify & go live
Validate the signed token on your backend, then ship. Pay only for successful verifications — failed sends are free.
Frequently asked questions
What is OTP verification?
OTP (One-Time Password) verification confirms a user owns a phone number by sending a single-use code via SMS. The user enters the code in your app to prove their identity — a common method for login, signup, and fraud prevention.
What is DoneOTP?
DoneOTP is an OTP-as-a-Service platform that delivers phone verification via a REST API or drop-in widget. It covers 190+ countries, 600+ mobile operators, and average delivery under 3 seconds — with no platform fee, pay only for successful verifications.
Is there a platform or setup fee?
No. You only pay per successful verification (SMS). There are no hidden platform fees.
Why is pricing shown as a base rate?
SMS costs differ by destination country and carrier, so we publish a base rate and a full country list rather than fixed packages. See international rates for per-country pricing.
Am I charged for failed sends?
No. If an SMS fails to send, the charged credit is automatically refunded.
How do I get volume pricing?
High-volume and committed-use plans get custom discounts plus an SLA. Contact our sales team for a tailored quote.
How long does integration take?
Minutes with the drop-in widget, or an afternoon with the REST API. See the OTP API documentation for a full integration guide.
Let's talk business
Whether you need OTP verification for 1,000 or 10 million monthly users, our infrastructure scales with you. Fill in the form and our team will reach out within 24 hours.