OTP and 2FA via SMS
OTP messages contain one-time codes for registration, login, withdrawals and identity verification.
Contact a specialistYour access code: [code]. Valid for [duration].
Which actions use OTP?
Verification of registration, login, withdrawals and identity.
Two-factor authentication at login.
A one-time code at registration.
A verification code for withdrawals.
SMS API and integrations
Send messages with a single HTTP API request from the system you already use.
You send messages through the HTTP API, and ACE SEND returns delivery confirmations to your system via webhooks. The same interface is used for promotional messages and OTP.
How we handle OTP delivery
Verification codes are sent via SMS.
Carrier filters that block promotional messages often also block login codes.
Route and sender ID
We select an SMS route for the country and messaging use case. We take available sender IDs and registration requirements into account.
Delivery testing
During an agreed test, we check delivery, latency and the return of statuses. If you already use another provider, you can compare results on a portion of your traffic.
Statuses and error analysis
We return delivery confirmations through webhooks. If a technical issue occurs, we investigate the specific message using its ID.
Questions and answers
What is SMS OTP?+
An SMS OTP (One-Time Password) is a message for identity verification and user authentication. It contains a one-time code with a limited validity period to verify identity, confirm transactions or access online services.
What actions is OTP used for?+
Confirming registration, login, withdrawals and identity.
Can promotional messages and OTP be sent through a single API?+
Yes. A single HTTP API is used for promotional messages and OTP. Delivery confirmations are returned through webhooks.
How can I test OTP delivery?+
Specify the countries and monthly volume of messages containing verification codes. Routes and rates are calculated separately for each country.
Why can OTP be difficult to deliver?+
Carrier filters that block promotional messages often also block login codes.
We select an SMS route for the country and messaging use case. We take available sender IDs and registration requirements into account.
During an agreed test, we check delivery, latency and the return of statuses. If you already use another provider, you can compare results on a portion of your traffic.
We return delivery confirmations through webhooks. If a technical issue occurs, we investigate the specific message using its ID.
Ready to test OTP delivery?
Specify the countries and monthly volume of messages containing verification codes. Routes and rates are calculated separately for each country.
Contact a specialist