Daycal

Daycal provides a simple scheduling page that lets others book time with you, automatically handling time‑zone differences, holidays, focus blocks and daily limits. The service integrates with Google Calendar and works with AI assistants such as Claude, ChatGPT, Cursor, and any MCP‑compatible assistant. Users share a personalized link, and bookings are added directly to their calendar without extra configuration.

Daycal publishes 2 API contracts indexed on the APIs.io network: Owner API and Public API. Tagged areas include Scheduling, Calendar, AI Assistant, Productivity, and Automation.

The Daycal catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Daycal’s developer surface includes authentication and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.9/100 thin Agent 49/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract

Scheduling Calendar AI Assistant Productivity Automation Company

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 33.9/100 · thin

Contract Quality 12.6 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 3.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 49/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs

4 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 11.9 — up to +17.6 composite points
Access Clarity scores 21.1 — up to +15.8 composite points
Operational Transparency scores 10.5 — up to +11.6 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/daycal-io/apis.yml: open an issue on github.com/api-evangelist/daycal-io 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.

Daycal Owner API

The owner API from Daycal — 13 operation(s) for owner.

Daycal Public API

The public API from Daycal — 7 operation(s) for public.

Semantic Vocabularies 1

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

Daycal Io Context

8 classes · 22 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Daycal API Rules

44 rules · 42 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

Booked

2 properties

JSON SCHEMA

Booking

8 properties

JSON SCHEMA

ManagedBooking

11 properties

JSON SCHEMA

ManagedPage

7 properties

JSON SCHEMA

Page

8 properties

JSON SCHEMA

Slot

2 properties

JSON SCHEMA

Security Posture 3

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

Daycal Io Authentication

http · 1 scheme

SECURITY

Daycal Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Daycal Io Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Daycal Io Agentic Access

21 operations · 10 acting

AGENTIC

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 5

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: daycal-io
name: Daycal
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://daycal.io/og.png
description: Daycal provides a simple scheduling page that lets others book time with you, automatically handling time‑zone
  differences, holidays, focus blocks and daily limits. The service integrates with Google Calendar and works with AI assistants
  such as Claude, ChatGPT, Cursor, and any MCP‑compatible assistant. Users share a personalized link, and bookings are added
  directly to their calendar without extra configuration.
url: https://artifacts.apis.io/daycal-io/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-05 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-05'
modified: '2026-11-05'
tags:
- Scheduling
- Calendar
- AI Assistant
- Productivity
- Automation
- Company
tags_raw:
- Scheduling
- Calendar
- AI-Assistant
- Productivity
- Automation
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/daycal-io-agentic-access.yml
- type: Spectral
  url: rules/daycal-io-rules.yml
- type: JSONLD
  url: json-ld/daycal-io-context.jsonld
- type: Vocabulary
  url: vocabulary/daycal-io-vocabulary.yml
- type: DataModel
  url: data-model/daycal-io-data-model.yml
- type: Security
  url: security/daycal-io-vulnerability-disclosure.yml
- type: ErrorCatalog
  url: errors/daycal-io-problem-types.yml
- type: Conformance
  url: conformance/daycal-io-conformance.yml
- type: LLMsTxt
  url: llms/daycal-io-llms.txt
- type: SecurityTxt
  url: well-known/daycal-io-security.txt
- type: WellKnown
  url: well-known/daycal-io-well-known.yml
- type: Hosts
  url: hosts/daycal-io-hosts.yml
- type: Vendors
  url: vendors/daycal-io-vendors.yml
- type: TermsOfService
  url: https://daycal.io/terms
- type: PrivacyPolicy
  url: https://daycal.io/privacy
- type: Authentication
  url: authentication/daycal-io-authentication.yml
- type: VulnerabilityDisclosure
  url: security/daycal-io-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/daycal-io-domain-security.yml
- type: Website
  url: https://daycal.io/
apis:
- aid: daycal-io:daycal-io-owner-api
  name: Daycal Owner API
  description: The owner API from Daycal — 13 operation(s) for owner.
  humanURL: https://daycal.io/api
  baseURL: https://daycal.io
  tags:
  - Owner
  tags_raw:
  - owner
  properties:
  - type: OpenAPI
    url: openapi/daycal-io-owner-api-openapi.yml
  - type: JSONSchema
    url: json-schema/daycal-io-page-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-managed-page-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-managed-booking-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-booking-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-slot-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-booked-schema.json
- aid: daycal-io:daycal-io-public-api
  name: Daycal Public API
  description: The public API from Daycal — 7 operation(s) for public.
  humanURL: https://daycal.io/api
  baseURL: https://daycal.io
  tags:
  - Public
  tags_raw:
  - public
  properties:
  - type: OpenAPI
    url: openapi/daycal-io-public-api-openapi.yml
  - type: JSONSchema
    url: json-schema/daycal-io-page-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-managed-page-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-managed-booking-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-booking-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-slot-schema.json
  - type: JSONSchema
    url: json-schema/daycal-io-booked-schema.json
x-enrichment:
  date: '2026-11-05'
  status: enriched
  artifacts_added: 32
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Daycal API — frequently asked questions

Does Daycal have an API?

Yes. APIs.io lists 2 APIs from Daycal, including Daycal Owner API and Daycal Public API.

Is there an OpenAPI specification for the Daycal API?

Yes. APIs.io indexes 2 OpenAPI specifications for Daycal, each linked for download from this page.

How do I authenticate with the Daycal API?

Daycal documents its authentication (http · 1 scheme). The details are profiled on APIs.io as Daycal Io Authentication.

Is the Daycal API ready for AI agents?

Daycal has a Kin Score of 33.9 out of 100 (thin) and an Agent Readiness score of 49.0 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

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