Authentication & Authorization — entry 002 of 4
GetOTP
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.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingMeteredBilled per request beyond a limited free quota.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score55
Authentication15/25API key required
Pricing11/20Metered / usage-based pricing
Docs0/20No docs or spec available
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/getotp/"><img src="https://greatapis.com/badge/getotp.svg" alt="Scored 55 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.