Verify phone numbers for a fraction of SMS OTP cost.
Your users confirm their number with one WhatsApp tap — no SMS gateway, no per-message OTP fees, no codes to type. A hosted verification screen you drop into any signup, with signed results sent straight to your backend.
SMS OTP costs add up — on every signup, real or fake
You pay per message for every code you send, including the bots and typos that never convert. At scale, phone verification quietly becomes a real line item.
Per-message SMS fees
Every SMS OTP you send is billed — and you pay it on failed attempts and fraudulent signups too, not just successful ones.
WhatsApp inbound, a fraction of the cost
The user taps a WhatsApp link and messages you — that inbound message carries no per-SMS gateway fee. You pay only when a verification actually succeeds.
Ownership confirmed in seconds, over WhatsApp
The user proves they hold the number by tapping a WhatsApp link and sending a prepared message. We match it and send a signed result to your backend.
Start a verification
Your backend calls our API with the user's phone number. You get back a hosted verify link, branded as you.
User taps WhatsApp
On the hosted screen they tap “Continue with WhatsApp” and send the prepared message from their number — no code to type.
You get a signed result
We match the sender to the session and send a signed confirmation to your backend. Trust it server-side and let them through.
Same security as SMS OTP, a fraction of the cost
No per-message gateway bill, and you’re only charged for verifications that succeed.
SMS OTP
- Billed on every send, even failures
- Fraud and typos cost you money
- SMS gateway to set up and maintain
LinesVerify (WhatsApp)
- No per-SMS gateway fee on inbound
- You pay only when it verifies
- Drop-in hosted screen, your branding
Two calls and you’re live
Start a verification, point the user at the hosted screen, confirm the result on your server.
Start
One POST with the phone number returns a hosted, branded verify link.
Show
Open it as a popup with our SDK, or redirect. The user taps WhatsApp and confirms.
Confirm
Confirm server-side (or verify our signed callback) and trust the result. The browser alone is never proof.
Priced well below SMS OTP
No per-message gateway bill. You’re charged only for verifications that succeed.
- 1000 free verifications
- WhatsApp verification
- Hosted screen with your branding
- SDK popup + signed callbacks
- Dashboard + API key
- 5,000 verifications included
- Everything in Free
- Higher rate limits
- Custom logo & brand colour
- Priority support
- Committed-volume pricing
- SLA + dedicated support
- Custom callback & data terms
- Security review
Teams that left SMS OTP behind
What companies say after switching phone verification to WhatsApp.
"We moved signup verification to WhatsApp and our phone-OTP bill basically disappeared. The drop-in screen took an afternoon to integrate."
"Fraudulent signups were burning our SMS budget. With LinesVerify we only pay when a number actually verifies — costs dropped sharply."
"Users love that there's no code to type — they just tap WhatsApp. Completion rates went up and support tickets went down."
Stop paying SMS OTP prices to verify a phone
Create an account, verify your own number over WhatsApp, and start verifying users in minutes.
WhatsApp verification, answered
The common questions about replacing SMS OTP with WhatsApp.
What is LinesVerify?
LinesVerify is a phone number verification service that confirms a user owns their number over WhatsApp instead of SMS OTP. It's a drop-in, branded hosted screen that sends a signed result to your backend.
How is WhatsApp verification cheaper than SMS OTP?
There's no per-message SMS gateway fee. The user sends an inbound WhatsApp message, and you're charged only for verifications that actually succeed — never for failed sends, bots, or typos.
Does phone verification work without a mobile network?
Yes. Because it runs over WhatsApp, a user on WiFi or mobile data can verify even with no cellular or SIM signal — something SMS OTP cannot do.
Is WhatsApp verification faster than SMS OTP?
Yes. There's no waiting for a code to arrive. The user taps “Continue with WhatsApp,” sends a prepared message, and is verified in seconds.
Does LinesVerify store our customers' personal data?
No. LinesVerify confirms phone ownership and nothing more — no names, emails, or contacts, and no message content is stored. Only a signed yes/no ownership result is returned to your backend.
How do I integrate LinesVerify?
Two API calls: start a verification with the phone number, then confirm the signed result on your server. A hosted, branded screen handles the WhatsApp step for the user.