AddEvent

AddEvent provides calendar integration tools that let websites and apps add events to users’ calendars via simple buttons, dynamic links, and subscription calendars. Their platform includes RSVP forms, analytics, and marketing features to reduce no‑shows and improve event attendance. Developers can access a RESTful Calendar Events API, documentation, and SDKs to embed scheduling functionality across multiple platforms.

AddEvent publishes 6 API contracts indexed on the APIs.io network, including Calendar subscribers API, Calendars API, Events API, and 3 more. Tagged areas include Calendar, Integration, Marketing, API, and SaaS.

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

AddEvent’s developer surface includes authentication, support, changelog, getting-started guide, documentation, API reference, pricing, and 30 more developer resources.

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63.1/100 strong Agent 23/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 3 Agent Skills

Calendar Integration MarketingAPISaaSEvents

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 63.1/100 · strong

Contract Quality 12.1 / 21

Developer Ergonomics 9.6 / 17

Access Clarity 15.7 / 17

Operational Transparency 5.8 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 23/100 · agent aware

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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

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
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 57.0 — up to +10.8 composite points
Contract Governance scores 22.0 — up to +9.4 composite points
Developer Ergonomics scores 56.5 — up to +8.7 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/addevent/apis.yml: open an issue on github.com/api-evangelist/addevent 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 →

APIs 6

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

AddEvent Calendar subscribers API

The Calendar subscribers API from AddEvent — 2 operation(s) for calendar subscribers.

AddEvent Calendars API

The Calendars API from AddEvent — 2 operation(s) for calendars.

AddEvent Events API

The Events API from AddEvent — 2 operation(s) for events.

AddEvent RSVP attendees API

The RSVP attendees API from AddEvent — 3 operation(s) for rsvp attendees.

AddEvent Templates API

The Templates API from AddEvent — 3 operation(s) for templates.

AddEvent Timezones API

The Timezones API from AddEvent — 1 operation(s) for timezones.

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

addevent-create-and-retrieve-calendar

AGENT SKILL

addevent-manage-event

AGENT SKILL

addevent-rsvp-attendee-create-and-retrieve

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Addevent Plans Pricing

7 plans

PLANS

Semantic Vocabularies 1

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

Addevent Context

15 classes · 74 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

AddEvent API Rules

14 rules · 12 errors 1 warnings 1 info

SPECTRAL

Security Posture 4

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

Addevent Authentication

1 scheme

SECURITY

Addevent Domain Security

TLSv1.3 · DMARC

SECURITY

Addevent Vulnerability Disclosure

no policy recorded

SECURITY

Addevent Trust Center

SOC 2, HIPAA, GDPR

SECURITY

Agentic Access 1

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

Addevent Agentic Access

22 operations · 10 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 8

Authentication, authorization, and security posture

SecurityTxt

Compliance

Authentication

SecurityTxt

Security

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Scroll for all 8

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

Roadmap

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: addevent
name: AddEvent
image: https://cdn.addevent.com/web/images/opengraph-image.png
description: AddEvent provides calendar integration tools that let websites and apps add events to users’ calendars via simple
  buttons, dynamic links, and subscription calendars. Their platform includes RSVP forms, analytics, and marketing features
  to reduce no‑shows and improve event attendance. Developers can access a RESTful Calendar Events API, documentation, and
  SDKs to embed scheduling functionality across multiple platforms.
url: https://raw.githubusercontent.com/api-evangelist/addevent/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Calendar
- Integration
- Marketing
- API
- SaaS
- Events
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: SecurityTxt
  url: well-known/addevent-addevent-security.txt
- type: AgenticAccess
  url: agentic-access/addevent-agentic-access.yml
- type: Plans
  url: plans/addevent-plans-pricing.yml
- type: Spectral
  url: rules/addevent-rules.yml
- type: JSONLD
  url: json-ld/addevent-context.jsonld
- type: Vocabulary
  url: vocabulary/addevent-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/addevent-data-model.yml
- type: Compliance
  url: https://www.addevent.com:443/c/legal/security
- type: Authentication
  url: authentication/addevent-authentication.yml
- type: ErrorCatalog
  url: errors/addevent-problem-types.yml
- type: Conformance
  url: conformance/addevent-conformance.yml
- type: LLMsTxt
  url: llms/addevent-llms.txt
- type: SecurityTxt
  url: well-known/addevent-jobs-security.txt
- type: WellKnown
  url: well-known/addevent-well-known.yml
- type: Hosts
  url: hosts/addevent-hosts.yml
- type: Vendors
  url: vendors/addevent-vendors.yml
- type: SDKs
  url: packages/addevent-packages.yml
- type: Packages
  url: packages/addevent-packages.yml
- type: Support
  url: https://help.addevent.com
- type: StatusPage
  url: https://addevent.statuspage.io/
- type: Security
  url: https://www.addevent.com:443/c/legal/security
- type: Roadmap
  url: https://www.addevent.com/integrations/1684/roadmap/zapier
- type: GitHubOrganization
  url: https://github.com/AddEventinc
- type: ChangeLog
  url: https://help.addevent.com/changelog
- type: GettingStarted
  url: https://docs.addevent.com/reference/getting-started
- type: TrustCenter
  url: security/addevent-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/addevent-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/addevent-domain-security.yml
- type: Website
  url: https://www.addevent.com/
- type: Documentation
  url: https://www.addevent.com/c/documentation
- type: APIReference
  url: https://www.addevent.com/c/documentation/calendar-events-api
- type: Pricing
  url: https://www.addevent.com/c/plans-and-pricing
- type: Blog
  url: https://www.addevent.com/blog
- type: SignUp
  url: https://dashboard.addevent.com/signup?source=homepage&position=navigation&btn=signup
- type: TermsOfService
  url: https://www.addevent.com/c/legal/terms
- type: PrivacyPolicy
  url: https://www.addevent.com/c/legal/privacy
apis:
- aid: addevent:addevent-calendar-subscribers-api
  name: AddEvent Calendar subscribers API
  description: The Calendar subscribers API from AddEvent — 2 operation(s) for calendar subscribers.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - Calendar subscribers
  properties:
  - type: OpenAPI
    url: openapi/addevent-calendar-subscribers-api-openapi.yml
- aid: addevent:addevent-calendars-api
  name: AddEvent Calendars API
  description: The Calendars API from AddEvent — 2 operation(s) for calendars.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - Calendars
  properties:
  - type: OpenAPI
    url: openapi/addevent-calendars-api-openapi.yml
- aid: addevent:addevent-events-api
  name: AddEvent Events API
  description: The Events API from AddEvent — 2 operation(s) for events.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/addevent-events-api-openapi.yml
- aid: addevent:addevent-rsvp-attendees-api
  name: AddEvent RSVP attendees API
  description: The RSVP attendees API from AddEvent — 3 operation(s) for rsvp attendees.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - RSVP attendees
  properties:
  - type: OpenAPI
    url: openapi/addevent-rsvp-attendees-api-openapi.yml
- aid: addevent:addevent-templates-api
  name: AddEvent Templates API
  description: The Templates API from AddEvent — 3 operation(s) for templates.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/addevent-templates-api-openapi.yml
- aid: addevent:addevent-timezones-api
  name: AddEvent Timezones API
  description: The Timezones API from AddEvent — 1 operation(s) for timezones.
  humanURL: https://www.addevent.com/c/documentation/calendar-events-api
  baseURL: https://api.addevent.com/calevent/v2
  tags:
  - Timezones
  properties:
  - type: OpenAPI
    url: openapi/addevent-timezones-api-openapi.yml
x-submission-probe: 301 (-> https://www.addevent.com:443/) 2026-10-26
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 30
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

AddEvent API — frequently asked questions

Does AddEvent have an API?

Yes. APIs.io lists 6 APIs from AddEvent, including AddEvent Calendar subscribers API, AddEvent Calendars API and AddEvent Events API, and 3 more.

Is there an OpenAPI specification for the AddEvent API?

Yes. APIs.io indexes 6 OpenAPI specifications for AddEvent, each linked for download from this page.

How do I authenticate with the AddEvent API?

AddEvent uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Addevent Authentication.

How much does the AddEvent API cost?

APIs.io lists 7 pricing plans for AddEvent, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the AddEvent API ready for AI agents?

AddEvent has a Kin Score of 63.1 out of 100 (strong) and an Agent Readiness score of 22.6 (agent-aware), scored by API Evangelist on 2026-10-31.

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