Telegram two-factor authentication for your app
Adding a second factor is the single highest-impact security change most apps can make. Telegram delivery avoids SMS costs and SIM-swap exposure while staying familiar to users.
Where 2FA fits
Trigger a code after the primary credential succeeds, and before you issue a session.
- Sign-in from a new device or IP
- Password or email change
- High-value actions such as payouts or key rotation
- Admin console access
Implementation sketch
Store the Telegram handle on the user record during enrolment, then reuse it for every challenge.
curl -X POST https://teleauth.run.place/api/public/v1/otp/send \
-H "x-api-key: $TELEAUTH_API_KEY" \
-H "content-type: application/json" \
-d '{ "username": "ada_lovelace" }'Auditing
Every send and verify is written to the project's authentication log with recipient, outcome and timestamp, so you can investigate suspicious sign-in attempts and export evidence for reviews.
Common questions
How is this different from SMS 2FA?
There is no per-message carrier cost and no SIM-swap interception path. Delivery is an encrypted Telegram message from your own bot.
What if a user loses Telegram access?
Keep recovery codes or a second channel. TeleAuth verifies a factor; account recovery policy stays in your app.
Related guides
More ways to use Telegram for authentication and verification.
Passwordless login with Telegram
Replace passwords with Telegram one-time codes. Lower support load, no password database, and delivery your users already trust.
Send OTP without SMS
Cut SMS verification costs by delivering one-time codes through Telegram: no per-message fees, no carrier filtering, no SIM-swap risk.
Telegram OTP API
Send and verify one-time passwords through Telegram with two REST calls. Project API keys, 5-minute code expiry, signed webhooks and delivery logs.
Try telegram two-factor authentication with TeleAuth
Create a project, connect your Telegram bot, and send your first OTP in minutes.
Create free account