Reverse Call API

Trigger automated voice calls instantly via simple REST API. Perfect for OTP verification, transaction alerts, two-factor authentication, and critical notifications.

Simple REST API

Integrate voice calling into your app with just a few lines of code. Supports JSON requests, authentication via API keys, and webhooks for delivery status.

        POST /v1/call/reverse

        {

          "to": "919876543210",

          "message": "Your OTP is 123456",

          "language": "en"

        }

Blazing Fast Delivery

Calls are initiated within milliseconds. Average call setup time less than 2 seconds. High concurrency – thousands of calls per minute.

Text-to-Speech & Audio

Send dynamic text messages converted to natural-sounding speech in multiple languages (English, Hindi, Tamil, Telugu, etc.). Or upload pre-recorded audio files.

Real-time Analytics & Logs

Track call status: delivered, answered, busy, failed. Get detailed CDRs and delivery webhooks for your systems.

<2s

Avg call initiation

99.2%

Call completion rate

10+

Languages supported

24/7

API uptime

Key Features & Developer Friendly

Easy Integration

REST API with HMAC authentication
SDKs for PHP, Python, Node.js, Java, Ruby
Postman collection and detailed docs

Scheduled Calls

Set future delivery time (down to minute)
Recurring calls for reminders
Timezone-aware scheduling

Interactive Responses

Collect DTMF keypresses (1,2,3 etc.)
Branch call flow based on user input
Surveys, confirmations, menu options

Advanced Reporting

Dashboard with call logs, status filters
Export reports to CSV/Excel
Webhooks for real-time updates

Popular Use Cases

Voice OTP

Deliver one-time passwords via call for accessibility & fallback when SMS fails.

Transaction Alerts

Notify customers of card swipes, fund transfers, or high-value payments instantly.

2FA Authentication

Add an extra layer of security with voice-based verification codes.

Emergency Broadcasts

Critical system alerts, security breaches, or disaster warnings.

Appointment Reminders

Healthcare, salons, service bookings – reduce no-shows with voice reminders.

Delivery Confirmation

Call customers to confirm delivery time slots and collect consent.

Start building with Reverse Call API today

Get your API keys instantly. Free credits on signup. No setup fees – pay only for successful calls.

Get API Access →