Use AssistCall with Cal.com

AssistCall answers your business calls 24/7 and can send each call, message and booking to Cal.com through Webhook, Live API actions, Zapier, Make, n8n.

Cal.com: Open-source scheduling links and booking pages, hosted or self-hosted, used by consultants, agencies and software teams.

Connects

Example call

A caller asks for a demo on Tuesday afternoon. The receptionist pulls open slots from Cal.com and books 3:30pm with POST /v2/bookings. The host sees the booking in Cal.com and gets AssistCall's call summary by email.

During a call, the receptionist reads open slots for an event type from Cal.com's GET /v2/slots endpoint and offers them to the caller.
The booking is created in Cal.com with POST /v2/bookings using your API key, with the caller's name and time zone.
Cal.com's Booking Created trigger and AssistCall's call events feed the same Make or n8n workflow, so web and phone bookings end up in one sheet or CRM.

How it connects

Webhook: Signed JSON for every call, message and booking, sent to any HTTPS URL you choose.
Live API actions: During the call, the receptionist calls the app's API with your key to look up or create records.
Zapier: Send AssistCall events to a Zap (Webhooks by Zapier, Catch Hook), then use the app's Zapier actions. Needs a paid Zapier plan.
Make: Start a Make scenario with a custom webhook and use the app's Make modules.
n8n: Start an n8n workflow with a webhook node, then call the app with its node or an HTTP request.
Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.

About Cal.com's API

Self-serve API: you can create a key in your account
Style: REST (API v2)
Authentication: API key (Bearer cal_live_...) or OAuth
On Zapier: yes. On Make: yes.

API keys are created in Cal.com settings, and API key requests are limited to 120 per minute. Cal.com's pricing page lists 'Custom APIs' on Teams and higher plans, so check that your plan covers the endpoints you need. GET /v2/slots returns open times and POST /v2/bookings creates a booking. Webhooks (BOOKING_CREATED, cancelled, rescheduled and others) can be signed with a secret.

Not included: no one-click Cal.com app, no listing in Cal.com's marketplace, no two-way sync, and no partnership with Cal.com, Inc..

Researched by the AssistCall team and checked against Cal.com, Inc.'s public pages on October 24, 2026. Cal.com is a trademark of Cal.com, Inc.. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by Cal.com, Inc..

More Calendars and scheduling integrations

Calendly: Online scheduling links that let clients pick an open time on your calendar, used by consultants, coaches, sales teams and service businesses.
Google Calendar: Google's online calendar, included with Gmail and Google Workspace, which many small businesses use to track appointments, jobs and staff schedules.
Microsoft Outlook Calendar: The calendar in Outlook and Microsoft 365, used by offices that run their email, meetings and scheduling on Microsoft 365.
Square Appointments: Square's booking and payments app for appointment businesses such as salons, barbershops, spas and wellness studios.
Acuity Scheduling: Online appointment scheduling from Squarespace with intake forms, packages and payments, used by solo practitioners and small service teams.
Microsoft Bookings: Microsoft 365's booking pages and shared appointment calendar for teams, connected to Outlook and Teams.

All product and company names in this directory are trademarks or registered trademarks of their respective owners, used only to identify systems AssistCall can send call information to or receive information from. Their use does not imply any affiliation with or endorsement by their owners. AssistCall connects using signed webhooks, the business's own API keys, automation platforms (Zapier, Make, n8n) the business sets up in its own account, and call forwarding. AssistCall does not provide one-click connectors, marketplace apps, certifications or two-way record or calendar sync, and does not sign HIPAA business associate agreements. Vendor features, plans and API access can change; information last checked October 24, 2026.