Are wallet-based providers really pay-as-you-go?

Mostly yes. You pre-deposit money to a wallet, then OTPs are debited per send. There is no monthly fee in either direction; idle wallets do not get charged.

Will the rate go up if my volume goes down?

On true pay-as-you-go, no. The same Rs 0.25 per OTP applies whether you send 100 or 100,000. Volume-discounted contracts trade lower per-rate for monthly minimums.

Do unused wallet credits expire?

Provider dependent. StartMessaging credits do not expire under our refund policy; some providers expire wallets after 12–24 months of inactivity.

SMS API Comparisons

OTP API With No Monthly Fees in India

Pure pay-as-you-go OTP API providers in India — no monthly minimums, no platform fees. How the model works, who it suits, and a head-to-head with subscription-based providers.

2 May 2026|7 min read

StartMessaging Team

Engineering

Most early-stage and mid-market Indian apps don’t want the ceremony of an MSA, monthly minimum, or finance approval cycle just to start sending OTPs. Pay-as-you-go OTP APIs collapse the commitment to a wallet deposit — which is why the “no monthly fees” query is so popular.

What “No Monthly Fees” Really Means

No minimum monthly spend.
No platform / dashboard / API access fee.
Charged only per OTP delivered (or attempted).
Pre-funded wallet model.

Who This Model Suits

Early-stage products with bursty or unknown volume.
Side projects and indie SaaS.
Hackathons and prototypes.
Apps with seasonal volume (travel, ticketing, education).

Who It Doesn’t Suit

Enterprise procurement that mandates committed contracts.
Apps already at > 1M OTPs/month — volume contracts beat list price.
Teams that prefer fixed monthly billing for accounting simplicity.

Pay-As-You-Go vs Subscription

	Pay-As-You-Go	Subscription
Onboarding	Minutes	Days–weeks
Minimum spend	None	Rs 5,000–50,000+
Per-OTP rate	List	Discounted
Cancellation	Drain wallet	Notice + paperwork
Best for	0–500k OTPs/month	1M+ OTPs/month

Pitfalls to Watch

Wallet expiry — read the refund policy.
Hidden “dashboard fees” or per-API-key charges.
International OTP markup that doesn’t show on the headline rate.

FAQ

StartMessaging is pure pay-as-you-go: Rs 0.25 per OTP, no monthly fees, wallet credits don’t expire. Refund policy here.

SMS API Comparisons

Cheapest OTP API in India (2026): Honest Comparison

Real per-OTP pricing for the major Indian OTP API providers in 2026 — including DLT setup costs, hidden monthly fees, and total cost of ownership at 100k OTPs/month.

StartMessaging Team·27 Apr 20269 min read

SMS Business

OTP API Pricing in India: 2026 Cost Guide

Detailed 2026 pricing comparison of OTP APIs in India. Compare per-OTP costs, hidden fees, DLT charges, volume discounts, and billing models across top providers.

StartMessaging Team·6 Feb 202613 min read

SMS Business

Pay-as-You-Go Wallet Billing for SMS OTP APIs in INR

Why prepaid wallet models work for Indian developers, how to forecast OTP spend, and how INR billing compares to DLT registration costs for SMS OTP.

StartMessaging Team·9 Apr 20268 min read

Ready to Send OTPs?

Integrate StartMessaging in 5 minutes. No DLT registration required.

Get Started Free Read API Docs