WhatsApp Authentication API

Verify users with WhatsApp OTP, without SMS friction.

Send login codes, signup verification, password resets, and step-up authentication through Meta's WhatsApp Business Cloud API. One focused API, transparent delivery-based pricing, and fraud controls built in.

For engineering, product, security, and growth teams replacing unreliable SMS verification.

Start for free See how it works

Sub-2s average delivery
Pay only when delivered
Optional Telegram fallback
No monthly minimums

Wevlix API

Meta WhatsApp Cloud API

Delivered

Request

Your backend requests an OTP through the Wevlix API.

Send through WhatsApp

Primary

Wevlix sends the approved authentication template through WhatsApp.

Fallback to Telegram

Optional

If WhatsApp delivery fails and fallback is enabled, the same OTP is automatically sent through Telegram.

Verify

Your backend verifies the code through the same Wevlix verification flow.

status: delivered1.8s

Use cases

Authentication flows users already understand.

Use WhatsApp for the moments where identity and speed matter, while keeping verification logic on your server.

Login and signup verification

Confirm phone ownership during registration or passwordless login with a familiar WhatsApp code.

Two-factor authentication

Add a second factor before sensitive account, payment, or profile actions.

Password resets

Deliver short-lived recovery codes without relying on congested SMS routes.

Step-up verification

Challenge risky sessions or high-value actions only when stronger assurance is needed.

Why Wevlix

A focused verification layer, not a communications maze.

Send and verify endpoints

Generate, deliver, and validate codes with expiry, attempt limits, and resend cooldowns handled consistently.

OTP-pumping protection

Rate limits by phone, IP, and prefix help stop abusive traffic before it drains your wallet.

Delivery status and webhooks

Track message state in real time and connect delivery events to your own observability stack.

Automatic Telegram Fallback

Protect critical login and verification flows from failed WhatsApp delivery. When enabled, Wevlix automatically routes the same OTP to Telegram—without requiring another API integration.

Developer workflow

From API call to verified user.

WhatsApp firstDelivery failedTelegram optional

1
Request
Your backend requests an OTP through the Wevlix API.
2
Send through WhatsApp
Wevlix sends the approved authentication template through WhatsApp.
3
Fallback to Telegram
If WhatsApp delivery fails and fallback is enabled, the same OTP is automatically sent through Telegram.
4
Verify
Your backend verifies the code through the same Wevlix verification flow.

cURL

Send your first authentication code.

A standard server-side request starts the verification flow.

curl -X POST "https://api.wevlix.com/v1/otp/send" \
  -H "X-API-Key: $WEVLIX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+14155550000",
    "otpMode": "generated",
    "clientMessageId": "login_attempt_123456"
  }'

Pricing

Pay only for what you deliver.

Transparent per-message rates that drop automatically as you scale. Not plans, not subscriptions, just honest pricing.

See your exact price before you send

Destination/region

Message type

Monthly volume

1,000messages

10k

50k

100k

200k

300k

Select your destination or region above to calculate your exact price.

Pay only for delivered messages. Failed sends are free.

Volume discounts

Select a destination or region to see volume pricing.

Sending more than 1M monthly? Talk to us about custom enterprise rates.

US & UK pricing guideSee when WhatsApp OTP can cut SMS verification costs by 70%.Compare current rates, calculate your break-even point, and plan a measured migration.Read the guide

FAQ

Common questions, clear answers.

What is a WhatsApp OTP API?

A WhatsApp OTP API lets your backend send one-time verification codes through WhatsApp and validate the code the user returns. It is commonly used for signup, login, two-factor authentication, password recovery, and sensitive actions.

Can WhatsApp OTP replace SMS verification?

For users who have WhatsApp, it can be the primary verification channel. Your product can still keep another recovery or fallback method for users who cannot receive WhatsApp messages.

What happens if a WhatsApp OTP is not delivered?

When Telegram Fallback is enabled, Wevlix automatically sends the same OTP through Telegram after WhatsApp reports a delivery failure. Your user can enter the same code, and your backend continues using the same verification flow.

How does Wevlix protect against OTP pumping?

Wevlix applies controls by phone number, IP address, and number prefix, together with attempt and resend limits, to reduce automated abuse and unexpected verification spend.

How am I charged for authentication messages?

Pricing depends on the destination and Meta authentication category rate. Wevlix uses prepaid, transparent per-message pricing with no subscription or monthly minimum, and charges only for delivered messages.

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