Authentication & Authorization · head-to-head
GetOTP vs Stytch
GetOTP is a multichannel one-time-password verification API covering SMS, voice call, Telegram, and Viber, with built-in retry and delivery-fallback logic so teams skip building their own OTP pipeline. Requests are authenticated with an X-OTP-Key header against api.otp.dev/v1/verifications, and responses are plain JSON with account_id/message_id tracking fields. New accounts get 100 free verification requests before billing switches to pay-per-verification.
Stytch provides passwordless authentication primitives — email magic links, SMS/WhatsApp OTP, passkeys, and OAuth social login — plus session and user management for consumer and B2B apps. API calls are authenticated with HTTP Basic Auth using a project's project_id as the username and its secret as the password against api.stytch.com, separate from the OAuth2 client-credentials scheme used only by its M2M Connected Apps endpoints. Stytch offers a free tier for early-stage usage alongside usage-based paid plans.
| GetOTP | Stytch | |
|---|---|---|
| Authentication | API Key | Basic Auth |
| Pricing | metered | freemium |
| Formats | JSON | JSON |
| CORS | yes | no |
| HTTPS | Yes | Yes |
Stytch is freemium, while GetOTP is metered — Stytch is the cheaper way in.