LandinChat — WhatsApp marketing softwareLandinChat
WhatsApp Authentication

WhatsApp OTP service

Cut OTP cost 60-85% vs SMS, deliver sub-second globally, autofill into your app and fall back to SMS only when needed. Powered by Meta's Authentication template category.

  • 60-85% cheaper than SMS
  • Sub-2-second global delivery
  • One-tap autofill + SMS fallback

Key things to know

  • Authentication template

    Pre-approved one-tap copy template — no template review wait for standard OTP flows.

  • Send & verify API

    Two simple endpoints — send OTP and verify code. Returns success, expired or invalid.

  • SMS fallback

    Automatic SMS retry if WhatsApp undelivered in your configured window.

  • Rate-limit protection

    Per-phone-number and per-IP throttling out of the box to block abuse.

People also ask

Q.What is a WhatsApp OTP service?

A WhatsApp OTP service sends one-time passwords for login, signup, payment and 2FA over WhatsApp instead of SMS — using Meta's Authentication template category which is priced 60-85% lower than SMS in most countries.

Q.How much does WhatsApp OTP cost?

Approximate 2026 Authentication rates per message: India ₹0.115, US $0.0135, UK $0.0358, UAE $0.0146, Brazil $0.0157. Compare to local SMS at 2-10x higher per send.

Q.Is WhatsApp OTP faster than SMS?

Yes. WhatsApp OTPs typically deliver in under 2 seconds globally with 99%+ delivery, vs SMS which suffers from carrier filtering, especially on international routes.

Q.Can I fall back to SMS if WhatsApp fails?

Yes. LandinChat automatically falls back to SMS if a recipient does not have WhatsApp or the OTP message is undelivered within your configured window (default 30 seconds).

Q.Is one-tap OTP autofill supported?

Yes. With the Authentication template's one-tap copy button or zero-tap autofill (Android), users either tap to copy or have the code auto-filled into your app — fewer drop-offs than reading SMS.

Q.Does WhatsApp OTP need user opt-in?

No explicit Marketing opt-in is required because Authentication is a transactional category. The user requests the code by initiating login or signup, which counts as consent.

₹0.115
India per OTP
$0.0135
US per OTP
99%+
Delivery rate
<2s
Median delivery
Overview

Why teams move OTP from SMS to WhatsApp

SMS OTP is expensive, slow internationally and increasingly filtered by carriers. Meta priced WhatsApp Authentication templates separately in 2024 specifically to undercut SMS for OTP, login codes and 2FA.

Beyond cost, the Authentication template supports a one-tap copy button and zero-tap autofill on Android — meaning users do not even read the message, the code auto-fills into your app. Drop-offs collapse.

LandinChat ships a production-ready OTP service: approved template, send + verify endpoints, rate-limit protection, expiry handling, retry logic and automatic SMS fallback for users without WhatsApp.

Capabilities

Built for serious growth teams

Authentication template

Pre-approved one-tap copy template — no template review wait for standard OTP flows.

Send & verify API

Two simple endpoints — send OTP and verify code. Returns success, expired or invalid.

SMS fallback

Automatic SMS retry if WhatsApp undelivered in your configured window.

Rate-limit protection

Per-phone-number and per-IP throttling out of the box to block abuse.

Expiry control

Configure 1-60 minute validity. Codes invalidate automatically on use or expiry.

Audit log

Every send, verify, success and failure logged for compliance and fraud review.

How it works

Get live in days, not months

  1. 1

    Connect WhatsApp Business API

    Onboard your number under LandinChat's BSP — 24-48 hours including green tick eligibility.

  2. 2

    Use the Authentication template

    Pre-approved one-tap copy template ready to send. Add your brand name.

  3. 3

    Integrate send + verify

    Two REST endpoints. SDKs for Node, Python, PHP, Ruby and direct HTTP.

  4. 4

    Configure fallback

    Set SMS provider credentials and fallback window (default 30 seconds).

  5. 5

    Go live

    Switch login, signup, 2FA and transaction flows to WhatsApp OTP. Track cost savings live.

Comparison

WhatsApp OTP vs SMS OTP (2026)

CapabilityLandinChatSMS OTP
India per OTP₹0.115₹0.18-0.30
US per OTP$0.0135$0.0075-0.04
UAE per OTP$0.0146$0.04-0.08
Delivery speed<2s5-30s
One-tap autofillYesLimited
Opt-in requiredNo (user-initiated)No
Branded senderVerified businessNumeric short code
FAQ

Frequently asked questions

Cut your OTP bill by 60-85% this week.

LandinChat ships a production-ready WhatsApp OTP service with send/verify APIs, SMS fallback and Meta-cost pass-through.