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Developer API

Build Phone Call Capabilities Into Your App

Programmatically initiate AI phone calls, receive webhooks, and access transcripts. Simple REST API with comprehensive documentation.

Simple, Powerful API

Make AI phone calls with just a few lines of code

// Initiate a call
const response = await fetch('https://api.kallyai.com/v1/calls', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    phone_number: '+1-555-123-4567',
    task: 'Schedule a dental cleaning appointment for next week',
    caller_name: 'John Smith',
    language: 'en',
    webhook_url: 'https://yourapp.com/webhooks/kallyai'
  })
});

const { call_id, status } = await response.json();
// call_id: "call_abc123"
// status: "queued"

Everything You Need

A complete API for phone call automation

🔌

RESTful API

Simple, well-documented REST endpoints for initiating calls, checking status, and retrieving results.

🔔

Webhooks

Real-time notifications when calls complete, fail, or require attention. Integrate with your workflows.

📝

Full Transcripts

Access complete call transcripts, summaries, and extracted data via API responses.

🔐

Secure Auth

API key authentication with rate limiting. OAuth 2.0 available for enterprise integrations.

📊

Usage Analytics

Programmatic access to call history, usage metrics, and billing data.

🌐

Multi-Language

Make calls in English or Spanish. Specify language per call via the API.

What Developers Build

Integration scenarios and real-world applications

CRM Integration

Automatically initiate follow-up calls from your CRM when deals reach certain stages. Learn more

Examples: Salesforce, HubSpot, Pipedrive workflows

Appointment Scheduling

Connect with your booking system to automatically confirm or reschedule appointments. Learn more

Examples: Calendly, Acuity, custom booking systems

Customer Support

Deflect routine phone inquiries by having KallyAI make outbound calls on behalf of customers.

Examples: Helpdesk ticket automation, Zendesk integration

Workflow Automation

Trigger calls based on events in your systems. No manual intervention required.

Examples: Zapier, Make, n8n, custom webhooks

Data Collection

Gather information via phone calls at scale. Get structured data back via the API.

Examples: Surveys, price comparisons, availability checks

Custom Applications

Build phone call capabilities into your own products and services. Learn more

Examples: SaaS features, mobile apps, internal tools

API Access Coming Soon

Join the waitlist for early access to our developer API

What You'll Get

  • Full REST API access
  • Sandbox environment for testing
  • Webhooks and real-time notifications
  • Complete call transcripts via API
  • Official SDKs (JavaScript, Python, Go)
  • Priority developer support

Early access members will receive special launch pricing and dedicated onboarding support.

Developer Questions

What are the API rate limits?

Developer plans include 100 API calls/minute. Enterprise plans have higher limits and can request custom quotas based on needs.

Is there a sandbox environment?

Yes! All API plans include sandbox access for testing. Sandbox calls are simulated and don't incur charges.

What programming languages are supported?

The API is language-agnostic (REST + JSON). We provide official SDKs for JavaScript/TypeScript, Python, and Go. Community SDKs exist for Ruby, PHP, and Java.

How is API usage billed?

API calls are billed based on successful call minutes, same as the web interface. API access itself is included in Developer and Enterprise plans.

Can I use the API for high-volume campaigns?

Yes, but please contact us first for high-volume use cases. We want to ensure quality and compliance for all calls.

Get Early Access

Tell us about your project and be first in line when we launch