42min

42min offers a free, highly customizable meeting scheduling platform featuring routing forms, automations, round‑robin scheduling, meeting polls, team management, and a robust API with webhooks in 14 programming languages. It enables businesses to streamline appointment booking, integrate with CRM systems, and automate workflows without cost.

42min publishes 2 API contracts indexed on the APIs.io network, including API API, and 1 more. Tagged areas include Scheduling, Free, Webhook, and Automation.

The 42min catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

42min’s developer surface includes changelog, authentication, support, signup flow, pricing, engineering blog, getting-started guide, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

51.6/100 developing ▬ flat Agent 43/100 agent ready Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Scheduling Free Webhook Automation

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 51.6/100 · developing

Contract Quality 12.8 / 21

Developer Ergonomics 7.6 / 17

Access Clarity 9.4 / 17

Operational Transparency 6.1 / 11

Contract Governance 2.2 / 10

Discoverability 5.0 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 43/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 44.5 — up to +11.1 composite points
Contract Quality scores 60.4 — up to +9.9 composite points
Contract Governance scores 22.0 — up to +9.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/42min-us/apis.yml: open an issue on github.com/api-evangelist/42min-us to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

42min API

Scheduling, availability and bookings for the 42min platform.

42min API API

The 42min public REST API.

Pricing Plans 1

Published pricing tiers and plan structures.

42Min Us Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

42Min Us Rate Limits

8 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

42Min Us Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

42Min Us Context

24 classes · 115 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

42min API Rules

17 rules · 14 errors 1 warnings 2 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

Booking

27 properties

JSON SCHEMA

CreateBookingRequest

12 properties

JSON SCHEMA

CreateSeriesRequest

14 properties

JSON SCHEMA

EventTypeDetail

26 properties

JSON SCHEMA

SeriesActionResult

9 properties

JSON SCHEMA

Series

19 properties

JSON SCHEMA

Security Posture 2

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

42Min Us Authentication

3 schemes

SECURITY

42Min Us Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 10

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Idempotency

Conventions

Conformance

Webhooks

DataModel

ErrorCatalog

Webhooks

Scroll for all 10

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

ChangeLog

Support

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

Pricing

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: 42min-us
name: 42min
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · Self-serve signup
  confidence: high
  probe_state: gated
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-02'
  method: derived
image: https://42min.us/og/cover.png
description: 42min offers a free, highly customizable meeting scheduling platform featuring routing forms, automations, round‑robin
  scheduling, meeting polls, team management, and a robust API with webhooks in 14 programming languages. It enables businesses
  to streamline appointment booking, integrate with CRM systems, and automate workflows without cost.
url: https://artifacts.apis.io/42min-us/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Scheduling
- Free
- Webhook
- Automation
tags_raw:
- Scheduling
- Free
- API
- Webhooks
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/42min-us-rules.yml
- type: JSONLD
  url: json-ld/42min-us-context.jsonld
- type: Vocabulary
  url: vocabulary/42min-us-vocabulary.yml
- type: Idempotency
  url: conventions/42min-us-conventions.yml
- type: Conventions
  url: conventions/42min-us-conventions.yml
- type: Conformance
  url: conformance/42min-us-conformance.yml
- type: RateLimits
  url: rate-limits/42min-us-rate-limits.yml
- type: Plans
  url: plans/42min-us-plans-pricing.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/42min-us-webhooks.yml
- type: DataModel
  url: data-model/42min-us-data-model.yml
- type: ChangeLog
  url: changelog/42min-us-changelog.yml
- type: Authentication
  url: authentication/42min-us-authentication.yml
- type: ErrorCatalog
  url: errors/42min-us-problem-types.yml
- type: LLMsTxt
  url: llms/42min-us-llms.txt
- type: WellKnown
  url: well-known/42min-us-well-known.yml
- type: Hosts
  url: hosts/42min-us-hosts.yml
- type: Vendors
  url: vendors/42min-us-vendors.yml
- type: Webhooks
  url: https://42min.us/help/api/webhooks
- type: TermsOfService
  url: https://42min.us/legal/terms
- type: Support
  url: https://42min.us/help
- type: SignUp
  url: https://42min.us/360/signup
- type: Pricing
  url: https://42min.us/pricing
- type: Newsroom
  url: https://42min.us/news
- type: ChangeLog
  url: https://42min.us/news/changelog
- type: Blog
  url: https://42min.us/blog
- type: GettingStarted
  url: https://42min.us/help/getting-started/what-is-42min
- type: APIReference
  url: https://42min.us/help/api/llms-full.txt
- type: DomainSecurity
  url: security/42min-us-domain-security.yml
- type: Website
  url: https://42min.us/
apis:
- name: 42min API
  description: Scheduling, availability and bookings for the 42min platform.
  humanURL: https://42min.us/help/api/overview
  baseURL: https://api.42min.us
  aid: 42min-us:42min-api
- aid: 42min-us:42min-api-api
  name: 42min API API
  description: The 42min public REST API.
  humanURL: https://42min.us/help/api/llms-full.txt
  baseURL: https://api.42min.us
  properties:
  - type: OpenAPI
    url: openapi/_original/42min-us-api-openapi.yml
  - type: JSONSchema
    url: json-schema/42min-us-series-action-result-schema.json
  - type: JSONSchema
    url: json-schema/42min-us-booking-schema.json
  - type: JSONSchema
    url: json-schema/42min-us-series-schema.json
  - type: JSONSchema
    url: json-schema/42min-us-create-booking-request-schema.json
  - type: JSONSchema
    url: json-schema/42min-us-create-series-request-schema.json
  - type: JSONSchema
    url: json-schema/42min-us-event-type-detail-schema.json
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-31'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://api.42min.us/openapi.yaml
    status: null
  - url: https://api.42min.us/mcp
    status: 401
  - url: https://42min.us/
    status: 200
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

42min API — frequently asked questions

Does 42min have an API?

Yes. APIs.io lists 2 APIs from 42min, including 42min API and 42min API API.

Is there an OpenAPI specification for the 42min API?

Yes. APIs.io indexes 1 OpenAPI specification for 42min, each linked for download from this page.

How do I authenticate with the 42min API?

42min documents its authentication (3 schemes). The details are profiled on APIs.io as 42Min Us Authentication.

How much does the 42min API cost?

APIs.io lists 2 pricing plans for 42min, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the 42min API ready for AI agents?

42min has a Kin Score of 51.6 out of 100 (developing) and an Agent Readiness score of 43.3 (agent-ready), scored by API Evangelist on 2026-11-02.

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