WhatsApp OTP & authentication templates: cheaper than SMS in India
Why WhatsApp one-time-passcode delivery is faster and cheaper than SMS for Indian apps — template structure, delivery speed, and cost comparison.
If your app sends one-time passcodes (OTPs) for login or transaction verification, you're probably using SMS — and you're probably overpaying. WhatsApp authentication messages are faster, cheaper, and get delivered even when SMS is delayed. Here's the case for switching.
Cost: WhatsApp vs SMS
An authentication-category WhatsApp conversation costs around ₹0.145 — comparable to or cheaper than transactional SMS in India (₹0.15–0.25). On AiConva's pass-through pricing, that's Meta's rate at cost plus ₹0.10 platform fee. For high-volume OTP senders (banks, fintech, app logins), the saving across millions of OTPs is significant. See our pricing breakdown for the full math.
Speed and deliverability
WhatsApp OTPs deliver faster than SMS in most cases, and they don't get caught in DND filters or SMS aggregator delays. For time-sensitive verification (login, payment confirmation), the speed improvement meaningfully reduces login abandonment.
Template structure
An authentication template contains exactly one variable — the OTP. The standard form: 'Your verification code is {{1}}. Do not share it with anyone. It expires in 10 minutes.' No emojis, no marketing language, no extra variables. Submit it under the 'authentication' category for the correct pricing.
Use as fallback or primary
Many businesses run WhatsApp as the primary OTP channel with SMS as fallback for the small share of users not on WhatsApp (rare in India). The combination gives you better delivery rates and lower cost than SMS alone.
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