Zcal

Zcal is a free scheduling platform for booking meetings via shareable scheduling links, meeting polls, and team pages (round-robin and collective). Zcal does not publish a general-purpose public REST API; programmatic integration is delivered through outbound webhooks (event.created, event.rescheduled, event.cancelled) and no-code connectors such as Zapier and Make, plus native integrations including Zoom, Stripe, Google Analytics, and Meta Pixel.

Zcal publishes 3 APIs on the APIs.io network: Scheduling Links, Bookings, and Integrations and Webhooks. Tagged areas include Scheduling, Calendar, Booking, Meetings, and Webhook.

Zcal’s developer surface includes documentation, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
28.6/100 thin ▬ flat Agent 16/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0
AccessFreemium
3 APIs
SchedulingCalendarBookingMeetingsWebhook

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0
Composite quality — 28.6/100 · thin
Contract Quality 7.5 / 25
Developer Ergonomics 2.4 / 20
Access Clarity 9.5 / 20
Operational Transparency 2.7 / 13
Contract Governance 0.0 / 12
Discoverability 6.5 / 10
Agent readiness — 16/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Surface 0 / 5
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/zcal: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Zcal Scheduling Links

Unlimited shareable scheduling links, meeting polls, and customizable booking pages let invitees self-serve a time. This is a product surface managed through the Zcal web applic...

Zcal Bookings

Bookings (events) capture timing, hosts, attendees, location, and custom question responses. Booking data is surfaced to external systems through outbound webhooks rather than a...

Zcal Integrations and Webhooks

Outbound webhooks POST a JSON payload to a subscriber URL when a booking is created, rescheduled, or cancelled. Payloads can be verified with an optional HMAC SHA-256 signature ...

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Zcal

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Zcal Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zcal Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Zcal Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Zcal Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zcal Trust Center

SOC 2, ISO 27001

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Access & Security 2

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: zcal
url: https://raw.githubusercontent.com/api-evangelist/zcal/refs/heads/main/apis.yml
name: Zcal
kind: company
description: Zcal is a free scheduling platform for booking meetings via shareable scheduling links, meeting polls, and team
  pages (round-robin and collective). Zcal does not publish a general-purpose public REST API; programmatic integration is
  delivered through outbound webhooks (event.created, event.rescheduled, event.cancelled) and no-code connectors such as Zapier
  and Make, plus native integrations including Zoom, Stripe, Google Analytics, and Meta Pixel.
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zcal.png
tags:
- Scheduling
- Calendar
- Booking
- Meetings
- Webhook
tags_raw:
- Scheduling
- Calendar
- Booking
- Meetings
- Webhooks
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: zcal:scheduling-links
  name: Zcal Scheduling Links
  tags:
  - Scheduling
  - Booking
  - Links
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://help.zcal.co/
  properties:
  - url: https://help.zcal.co/
    type: Documentation
  - url: https://zcal.co/
    type: Website
  - url: openapi/_original/zcal-openapi.yml
    type: OpenAPI
  description: Unlimited shareable scheduling links, meeting polls, and customizable booking pages let invitees self-serve
    a time. This is a product surface managed through the Zcal web application; there is no documented public REST API for
    creating or managing scheduling links programmatically.
- aid: zcal:bookings
  name: Zcal Bookings
  tags:
  - Bookings
  - Event
  - Attendees
  tags_raw:
  - Bookings
  - Events
  - Attendees
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://help.zcal.co/
  properties:
  - url: https://help.zcal.co/
    type: Documentation
  - url: https://zcal.co/
    type: Website
  - url: openapi/_original/zcal-openapi.yml
    type: OpenAPI
  description: Bookings (events) capture timing, hosts, attendees, location, and custom question responses. Booking data is
    surfaced to external systems through outbound webhooks rather than a queryable public REST API.
- aid: zcal:integrations-webhooks
  name: Zcal Integrations and Webhooks
  tags:
  - Webhook
  - Integration
  - Automation
  tags_raw:
  - Webhooks
  - Integrations
  - Automation
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://help.zcal.co/integrations/webhooks
  properties:
  - url: https://help.zcal.co/integrations/webhooks
    type: Documentation
  - url: https://help.zcal.co/integrations/webhooks/webhook-payload
    type: Documentation
  - url: openapi/_original/zcal-openapi.yml
    type: OpenAPI
  description: Outbound webhooks POST a JSON payload to a subscriber URL when a booking is created, rescheduled, or cancelled.
    Payloads can be verified with an optional HMAC SHA-256 signature via the x-zcal-webhook-signature header. Connectors such
    as Zapier and Make, plus native Zoom, Stripe, Google Analytics, and Meta Pixel integrations, extend automation without
    a public REST API.
common:
- type: TrustCenter
  url: security/zcal-trust-center.yml
- type: DomainSecurity
  url: security/zcal-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/zcal
- type: Website
  url: https://zcal.co/
- type: Documentation
  url: https://help.zcal.co/
- type: Plans
  url: plans/zcal-plans-pricing.yml
- type: RateLimits
  url: rate-limits/zcal-rate-limits.yml
- type: FinOps
  url: finops/zcal-finops.yml
- type: Blog
  url: https://zcal.co/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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