DEVELOPER API

Voice Agents API

The most powerful API for building AI phone agents. Make calls, receive calls, transcribe conversations, and integrate with your existing stack. 10x easier than Vapi or Bland AI.

$10 free credits • No credit card required

Build Voice Agents in Minutes, Not Months

Simple, intuitive APIs that developers love. See how easy it is to get started.

example.js
// Create an AI voice agent with CallWhiz AI API
const response = await fetch('https://api.callwhiz.ai/v1/agents', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'Sales Assistant',
    voice: 'nova',
    language: 'en-IN',
    prompt: 'You are a helpful sales assistant...',
    model: 'gpt-4',
    functions: ['schedule_meeting', 'send_email']
  })
});

const agent = await response.json();

// Make an outbound call
const call = await fetch('https://api.callwhiz.ai/v1/calls', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    agent_id: agent.id,
    to: '+919876543210',
    from: '+918012345678',
    webhook_url: 'https://your-app.com/webhooks/call-events'
  })
});

Everything You Need to Build Voice AI

Outbound & Inbound Calls

Make calls to any phone number or receive calls on dedicated DIDs. Support for SIP, PSTN, and WebRTC.

AI Voice Agents

Deploy intelligent agents that understand context, handle interruptions, and speak naturally in 30+ languages.

Real-time Webhooks

Get instant notifications for call events, transcriptions, and agent actions. Build reactive applications.

Simple REST APIs

Clean, well-documented APIs that work with any programming language. Get started in under 5 minutes.

Enterprise Security

SOC2 compliant, end-to-end encryption, and GDPR ready. Your data is always secure.

Global Coverage

Place calls to destinations in 180+ countries, with local numbers available in 20+. Low latency, high quality.

Why Developers Choose CallWhiz AI Over Vapi

FeatureCallWhiz AIVapiBland AI
Setup Time< 5 minutes30+ minutes45+ minutes
Indian Phone Numbers✅ Native Support❌ Limited❌ Limited
Pricing₹0.50/min$0.05/min$0.08/min
Language Support30+ languages20 languages15 languages
WebRTC Support✅ Built-in⚠️ Beta❌ No
On-premise Deploy✅ Available❌ No❌ No
Live Support✅ 24/7⚠️ Business hours⚠️ Email only

Build Any Voice Application

Customer Support Automation

Sales & Lead Qualification

Appointment Scheduling

Survey & Feedback Collection

Emergency Response Systems

Recruitment Screening

Start Building Voice AI Today

Join thousands of developers building the future of voice communication

Free tier includes 1000 minutes/month