VOICE VERIFICATION APIBuilt for Sri Lanka

Verify users.
By voice.

Deliver secure six-digit codes by automated voice call. Start from the dashboard or connect your product with one simple API.

Create developer account →Read API docs

REST APIsimple integration5 minsecure expiryLKR walletusage billing

Try a voice verification

We'll call you with a one-time code.

ONE PLATFORM

From first request
to verified user.

Create an account

Get a wallet, dashboard and private API key immediately.

Send voice OTPs

Use the dashboard or one authenticated API request.

Track every result

See delivery, verification and balance history in real time.

CUSTOMER DASHBOARD

Welcome, Developer

Manage your wallet, API access and verifications.

Available balanceRs. 00 OTPs available

Total requests0Dashboard and API

Passed OTPs0Successfully verified

Cost per OTPRs. 0Charged on accepted send

SEND VOICE OTP

New verification

API CREDENTIAL

Your live API key

Keep this secret. Use it as a Bearer token or X-API-Key header.

••••••••••••

View documentation

WALLET

Request a top-up

RECENT VERIFICATIONS

Activity

Request	Mobile	Source	Status	Cost	Created

REST API · VERSION 1

Voice verification
in four requests.

Base URL: https://otp53.com. Authenticate every request with your dashboard API key.

Authentication

Send your key using either Authorization: Bearer YOUR_API_KEY or X-API-Key: YOUR_API_KEY.

1. Send an OTP

curl -X POST https://otp53.com/api/v1/otp/send -H "Authorization: Bearer YOUR_API_KEY" -H "Content-Type: application/json" -d '{"phone":"0771234567"}'

{ "ok": true, "request_id": "otp_...", "status": "sent", "expires_in": 300, "cost": 5, "balance": 45 }

2. Verify the code

curl -X POST https://otp53.com/api/v1/otp/verify -H "Authorization: Bearer YOUR_API_KEY" -H "Content-Type: application/json" -d '{"request_id":"otp_...","otp":"123456"}'

3. Check balance

curl https://otp53.com/api/v1/balance -H "X-API-Key: YOUR_API_KEY"

4. Check request status

curl https://otp53.com/api/v1/status/REQUEST_ID -H "X-API-Key: YOUR_API_KEY"

Error codes

400	Invalid phone, code or request
401	Missing or invalid API key
402	Insufficient wallet balance
429	Rate limit or attempts exceeded
502	Voice gateway unavailable

ADMIN OPERATIONS

Platform overview

Customers, wallets and voice verification activity.

Customers0Registered accounts

OTP requests0All channels

Passed00 today

Usage revenueRs. 0Accepted paid sends

PENDING TOP-UPS

Approval queue

Customer	Amount	Reference	Requested	Action

CUSTOMERS

Accounts and balances

Customer	Email	Balance	Created	Adjust balance

Verify users.By voice.