OTP Flow

The best SMS API in India without DLT and KYC

Choosing an SMS API in India usually means paperwork: DLT entity, header, template, KYC and a minimum recharge. OTP Flow removes the friction for OTP traffic while keeping delivery reliable and pricing clear.

Start for free API docs

From ₹0.40 per OTP · No DLT registration · No KYC

POST /send-otp
curl -X POST https://otpflow.in/send-otp \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "number": "9876543210",
        "purpose": "login",
        "ttl": 10 }'

# → { "success": true, "otp_id": "otp_k3J9xQ2mP0aZ7Vb1" }

curl -X POST https://otpflow.in/verify-otp \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "otp_id": "otp_k3J9xQ2mP0aZ7Vb1", "otp": "123456" }'

What to look for in an OTP SMS API

Speed of onboarding, delivery time, price per message, a clean API and flexible payments matter most for developers.

  • Onboarding in minutes, not days
  • Delivery in seconds on registered routes
  • Low per-OTP price that falls with bigger deposits
  • Simple REST API with send and verify
  • Payments by UPI, cards, Binance Pay and crypto

Why teams choose OTP Flow

No DLT registration and no KYC to start, a wallet instead of a subscription, automatic refunds when an SMS can't be sent, and a dashboard with full OTP history, transactions and API keys.

Pricing that rewards bigger deposits

Your per-OTP rate is set by your largest single deposit and you keep it for good. Check the pricing page for the current tiers.

Good to know

OTP Flow is built for transactional one-time passwords (login, signup, payments, delivery and similar verification). Promotional or bulk marketing messages are not supported.

Frequently asked questions

Is OTP Flow only for OTPs?+

Yes. It is focused on transactional OTP and verification messages, which keeps delivery fast and reliable.

What does it cost?+

From ₹0.40 per OTP depending on your largest single deposit. See the pricing page.

Which payment methods are accepted?+

UPI, cards and netbanking via Razorpay, Binance Pay (USDT) and crypto via OxaPay.

Send your first OTP today

Create an account in under a minute. No DLT registration, no KYC, no subscription.

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