How integrations work
Real-time function calling lets AI agents take actions during calls, while webhooks and API access keep your systems in sync. Browse the full catalog of supported tools.
Key takeaways
- TopCalls agents call functions against your REST APIs mid-conversation to book, look up, and update records.
- Webhooks push TopCalls call events, transcripts, and outcomes to any system the moment a call ends.
- Through Zapier and n8n automations, TopCalls connects to 5,000+ apps without writing custom code.
- CRM sync keeps HubSpot or Salesforce updated with TopCalls call outcomes, transcripts, and qualification data automatically.
- Calendar booking runs inside the call: TopCalls agents place confirmed meetings into Google Calendar, Cal.com, or Calendly.
- Integration usage adds nothing to the bill; TopCalls stays at $0.35/min whatever your agents connect to.
0
Full API access
0
Function calling
0
Apps via Zapier
Capabilities
What's under the hood
Every feature is designed to work together, giving you a complete system out of the box.
Function Calling
AI agents execute real-time actions during calls through REST API function calling. Book appointments, check inventory, update records, and process payments mid-conversation.
Webhooks
Receive real-time notifications for call events: started, completed, qualified, appointment booked. Push call data to any system that accepts webhooks.
CRM Integration
Sync call outcomes, transcripts, and qualification data directly to HubSpot, Salesforce, or any CRM. Keep your pipeline updated without manual data entry.
Calendar Booking
AI agents book directly into Google Calendar, Cal.com, or Calendly during calls. Prospects pick available slots and get instant confirmation without human intervention.
REST API
Full API access to manage agents, campaigns, contacts, and call data programmatically. Build custom workflows and integrate TopCalls into your existing tech stack.
Zapier & n8n
Connect TopCalls to 5,000+ apps through Zapier or n8n automations. Trigger campaigns from form submissions, update spreadsheets with call results, and more.
Use Cases
Built for real workflows
CRM-Driven Campaigns
Trigger outbound campaigns when leads enter a specific CRM stage. Call outcomes flow back to update deal status, add notes, and move prospects through your pipeline automatically.
Appointment Booking Workflows
AI agents check real-time calendar availability during calls and book confirmed appointments. Prospects receive instant email/SMS confirmations while your team gets notified.
Custom Business Logic
Use function calling to connect your AI agent to any internal system. Check order status, verify account details, process returns, or look up pricing during live calls.
Frequently asked questions
Does TopCalls have an API for building custom workflows?
Yes. The TopCalls REST API manages agents, campaigns, contacts, and call data programmatically, and webhooks deliver events as they happen. Teams use it to trigger campaigns from their own systems, pull transcripts into internal tools, and wire call outcomes into whatever pipeline logic they already run.
Can a TopCalls agent look up information in my systems during a call?
Yes, through function calling. When a prospect asks about an order, an account, or pricing, the TopCalls agent calls your endpoint, waits for the response, and answers with the live data, all within the same conversational turn. Setup is a matter of describing the function and its endpoint.
How do I connect TopCalls to a tool that has no native integration?
Three routes: Zapier or n8n, which cover 5,000+ apps between them; webhooks, which push call events to any URL you control; or the REST API for a direct integration. Most teams get an unlisted tool connected through Zapier in under an hour, no engineering ticket required.