Betting runs on moments: kick-off, a live odds change, a withdrawal. If a verification code arrives late or not at all, the player leaves and may not return. An OTP (one-time password) confirms that a player controls a real phone number before money moves, and it is the cheapest control that cuts fake accounts, account takeover and bonus abuse.
Where betting apps use OTP
- Sign-up: confirm the number before the first deposit or welcome offer
- Login from a new device, or after a password reset
- Withdrawals, and any change to the payout number
- Payout checks in Kenya: confirm an M-PESA number with a PIN prompt instead of a typed code
- Promotions: allow one bonus per verified number to limit multi-accounting
- Account recovery without a support call
What an OTP does not do
An OTP proves a player controls a phone number right now. It is not age or identity verification. Licensed operators still need the KYC and age checks their regulator requires, so confirm the rules in each country you operate in.
Why codes go missing, and how to fix it
Most failures come from a wrong number format, a slow carrier route, do-not-disturb or filtering rules, or sending on a single channel. Normalise numbers to international format, show a resend button with a short cooldown, and fall back to another channel automatically. With an ordered fallback such as SMS, then WhatsApp, then Voice, the same code is sent on the next channel if the first one fails or is not delivered in time. The player verifies once.
No Sender ID to buy
Many SMS providers expect you to register or buy your own Sender ID or shortcode before you can send. With Tambua you share ours, so there is nothing to buy, lease or register and you can send your first OTP the same day. Check each market's current rules if you later want your own brand name on messages.
Built for traffic spikes
Match days bring bursts of sign-ups and logins, and bots that pump sign-up forms with SMS requests. Rate limits per number and per IP, attempt limits, country allowlists and spend caps keep costs and delivery under control. Only carrier-accepted attempts are billed, failed attempts are free, and every attempt appears in your logs with its channel, status and cost.
Connect it to your risk engine
Tambua sends signed webhooks for otp.verified, otp.failed and otp.fallback_triggered, with HMAC signatures and retries for 24 hours, so you can feed verification results into fraud and bonus rules. Test keys return the code in the API response, so QA and staging can run the whole flow without a phone.
Integrate in two calls
Call send to deliver a code and keep the returned token on your server. Call verify with the token and the code the player typed. Leave the channel out and your fallback order runs. See the Tambua API docs for the Node SDK, per-country pricing and how Tambua compares with Africa's Talking, Termii and Twilio.
Get started
Start free with a test key, or email hello@tambua.me to talk through your sportsbook. Gambling is regulated and age-restricted: Tambua provides verification infrastructure only, and you remain responsible for licensing, age and identity checks, and responsible gambling controls.