Your verification codes,
over WhatsApp.
SMS OTP is expensive internationally, gets lost along the way, and attracts fraud. WhatsApp delivers your codes over a trusted channel, read within seconds. Send your OTPs via REST API from your normal WhatsApp account - no authentication templates to get approved, no business account, in under 200 ms.
The context
Why send an OTP over WhatsApp instead of SMS?
An OTP (one-time password) is a single-use code sent to confirm an identity; on the WhatsApp side, Meta's official API requires authentication templates to be approved before you can send a single message.
For years, SMS OTP was the standard for two-factor authentication. But it's aging badly: SMS is expensive internationally, its deliverability is uneven across carriers and countries, and it remains exposed to well-documented fraud - interception, SIM swap, and "SMS pumping" (fake traffic generated to inflate the bill). OWASP even recommends no longer treating SMS as a strong authentication channel.
WhatsApp changes the game: the message arrives over an encrypted channel that the user already checks several times a day, with a very high read rate and far better deliverability than SMS internationally. The code is read within seconds, without depending on the quality of the recipient's carrier network.
That leaves the entry cost. The official WhatsApp Business API offers "authentication templates," but it requires a verified Meta Business account, prior approval of each template, and per-conversation billing in the authentication category. That's exactly the friction our REST API removes: you send your WhatsApp OTPs from your normal account, with no templates, unlimited.
Comparison
SMS OTP / official WhatsApp API vs Unlimited Messaging
The same goal - delivering a reliable verification code - with very different constraints. Here, line by line, is what SMS OTP and the official WhatsApp API impose, and how our REST alternative frees you from it.
| SMS OTP / official WhatsApp APIcarriers or Meta via BSP | Unlimited Messagingyour account, via API | |
|---|---|---|
| Deliverability | SMS uneven by carrier and country | Encrypted WhatsApp channel, read in seconds |
| Cost per message / conversation | SMS expensive internationally; Meta bills per conversation (auth category) | Flat subscription, unlimited sends |
| Setup | Carrier contract or multi-day Meta onboarding | A few minutes |
| Authentication templates to approve | Template to be approved by Meta before any send | No template, free text |
| Business account required | Verified Meta Business account | Your normal WhatsApp account |
| International coverage | Surcharges and SMS pumping fraud out of zone | 180+ countries at the same price |
| Latency | Variable, depends on carrier gateways | Under 200 ms per API send |
| Unlimited | Billed per unit or per conversation | Unlimited messages, flat price |
Our approach
WhatsApp OTP via API, from your account, no paperwork
We keep the reliability of a trusted channel - WhatsApp, REST, webhooks - and remove the Meta friction: no authentication templates, no business account, no per-conversation cost.
Your normal WhatsApp account
You link the account you already use. No Meta Business account to create, no dedicated number, no business verification to send your verification codes.
Zero authentication templates
The official API requires an "authentication template" approved by Meta. With us, you write the message carrying the OTP, freely, with no prior approval.
Better deliverability than SMS
WhatsApp is an encrypted channel, opened several times a day. Your codes arrive and are read within seconds, internationally, without depending on carrier gateways.
Sent in under 200 ms
A POST to the REST API and the code is on its way. Low latency, real-time delivery webhooks: ideal for a smooth 2FA that doesn't keep the user waiting.
- Authentication templates to approve
- 0Authentication templates to approve
- Latency of an OTP send via API
- < 200 msLatency of an OTP send via API
- Countries covered at the same price
- 180+Countries covered at the same price
- From key to first code sent
- 5 minFrom key to first code sent
How it works
Send an OTP over WhatsApp in three steps
- 1
Link your account
Connect your existing WhatsApp account to Unlimited Messaging by scanning a QR code, like WhatsApp Web. No business account or dedicated number.
- 2
Generate the code server-side
Your application creates the single-use code, stores it with a short validity window, then calls our API to deliver it.
- 3
Call the REST API
A POST /messages with the recipient and the text containing the OTP. We route the WhatsApp message and you receive delivery and read webhooks.
FAQ
Questions about OTP and 2FA over WhatsApp
Sources
Sources & references
To check the information in this article for yourself:
Written by
Ilian · Senior Software Engineer
A senior software engineer, he founds and runs several tech companies. He builds products around messaging APIs, automation and AI integration, and shares here what he learns while building.
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