2Factor.in OTP API
2Factor.in OTP API: A phone verification API with SMS, voice fallback, and sandbox testing; paid plans start at ₹4,999/month. Ranked #8 of 24 in Phone Verification Software by our editors (8.4/10); pricing: Free plan; best for teams wanting SMS and voice OTP with a free plan.
At a glance
- Editor score8.4 / 10
- PricingFree plan
- Best forTeams wanting SMS and voice OTP with a free plan
- Free planYes
- Paid from₹4,999/mo
- SMS verificationYes
- Founded2013 · Whitefield, Bengaluru, Karnataka, India
- Facts checked24 Sep 2026
Where it wins
- SMS OTP, voice authentication, and automatic fallback routing
- REST API, SDKs, sandbox testing, webhooks, and delivery receipts
- Free Starter plan; Growth adds ₹5,000 in messaging credits
Where it doesn't
- Starter is limited to sandbox access and free test credits
- Growth begins at ₹4,999/month, apart from usage-based messaging rates
- Enterprise features such as dedicated routes and SSO are on the Enterprise plan
Our verdict on 2Factor.in OTP API
2Factor.in OTP API provides REST APIs and SDKs for phone verification and customer communications. It suits teams that need SMS OTP delivery and verification, with voice OTP available for fallback or voice authentication. The service runs in the cloud and offers a free Starter plan, so teams can explore its sandbox before choosing a paid subscription. Its wider communications platform also includes channels such as WhatsApp, RCS, email OTP, IVR, and outbound dialing.
The published plans distinguish testing from live messaging. Starter costs ₹0 per month and includes free test credits, an all-channel sandbox, REST API and SDKs, email support, and basic analytics. Growth costs ₹4,999 per month and includes ₹5,000 in messaging credits, all channels enabled, DLT and WABA onboarding, priority chat and email support, webhooks, real-time delivery receipts, and five team seats. The vendor also publishes usage-based SMS and OTP rates, so subscription price alone may not represent total messaging cost. Enterprise lists committed-volume discounts, dedicated routes and IPs, custom integrations, SSO, and a 99.99% uptime SLA.
Routing and delivery visibility are central strengths: unified multi-channel OTP routing, automatic route retry and failover, delivery webhooks, receipts, and analytics help teams track verification flows. API documentation includes examples for cURL, Node.js, Python, Go, and other languages. The supplied coverage is 190 countries, and the listed compliance standards are ISO 27001 and SOC 2. Support options vary by plan, with Enterprise listing 24×7 phone and Slack support and a dedicated account manager. Choose it if SMS and voice OTP, API access, and routing flexibility matter; teams seeking only a basic low-cost verification subscription should compare the recurring Growth fee and message usage costs with alternatives.
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2Factor.in OTP API pricing
All 3 2Factor.in OTP API plans and prices →
2Factor.in OTP API fact sheet
| Free plan | Yes |
|---|---|
| Paid from | ₹4,999/mo |
| SMS verification | Yes |
| Voice verification | Yes |
| Country coverage | 190 countries |
| Verification methods | Sms and voice |
| API access | Yes |
| OTP expiry control | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Compliance & security | ISO 27001, SOC 2 |
| Support | Email, Live chat, Phone, Tickets, Docs · 24/7 |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan (source) |
| Website | 2factor.in |
| Facts checked | 24 Sep 2026 |
Alternatives to 2Factor.in OTP API
- Twilio VerifyA developer-focused verification API with broad channels and usage-based pricing.9.3
- Infobip 2FAA multichannel OTP API for teams building verification into customer journeys.9.1
- Sinch Verification APIFlexible verification API with four methods and native mobile SDKs.9.0
See all 2Factor.in OTP API alternatives →
2Factor.in OTP API vs the competition
- 2Factor.in OTP API vs Twilio Verify
- 2Factor.in OTP API vs Infobip 2FA
- 2Factor.in OTP API vs Sinch Verification API
- 2Factor.in OTP API vs Vonage Verify
- 2Factor.in OTP API vs Bird Verify
- 2Factor.in OTP API vs Plivo Verify
Compare 2Factor.in OTP API with any tool side by side →
Also Ranked In
2Factor.in OTP API is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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