Circle website screenshot

Circle

Circle (circle.so) is an all-in-one community platform for creators, coaches, and brands - hosting discussions, courses, events, live streams, memberships, paywalls, and chat under a single branded space. This is the community software company at circle.so, NOT the USDC / stablecoin financial-services company. Circle exposes a documented public developer platform: an admin-authenticated Admin API (V2) for automations, migrations, and bulk administration; a Headless offering (Member API plus Auth API) for embedding Circle features into your own website or app via member-scoped JWT tokens; and a beta ActionCable WebSocket surface for realtime chat and notifications. API access is plan-gated to the Business plan and above.

Circle publishes 8 APIs on the APIs.io network, including Realtime WebSocket API, Admin - Courses API, Admin - Events API, and 5 more. Tagged areas include Community, Creators, Courses, Membership, and Event.

The Circle catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Circle’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
37.9/100 thin ▬ flat Agent 30/100 agent ready Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0
AccessPaid
1 published contract 1 MCP Servers
CommunityCreatorsCoursesMembershipEventChatCommunity PlatformReal-Time

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0
Composite quality — 37.9/100 · thin
Contract Quality 10.6 / 19
Developer Ergonomics 4.5 / 15
Access Clarity 5.4 / 15
Operational Transparency 2.8 / 10
Contract Governance 1.0 / 9
Discoverability 5.1 / 8
Regulatory Posture 1.8 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 30/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 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 Well-Known Document 0 / 5
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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
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 github.com/api-evangelist/circle-community: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

What adopting Circle moves on the Kin Score 1

Circle is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.

communitycapability map3 features checked 2026-09-25 · rubric v0.22.0

A Circle community earns a provider one check, support_channel (2 points): half when declared as Community, which the pointer probe does not read, and full when declared as Support and the page is publicly reachable. Circle is built for member communities with access rules and paywalls, so a community behind a login cannot show that it is live even when it is probed. The pages we fetched show no roadmap, changelog or blog feature, and embedding Circle comments in a provider’s blog earns nothing. There is no registry key, so Circle customers cannot be detected or measured.

Developer Ergonomics1.0 of 42 pts
CheckEarnsThrough
Support channeldiscounted
Developer Ergonomics195 providers whose only support-class pointer is Community all score support_channel partial (“pointer liveness 0.5”), measured 2026-09-25. No circle.so support pointer appears in the 2026-09-22 probe, so how Circle hosts answer a probe has not been measured.		 1.0 of 2 Post, chat, event and course spaces
Across 8977 providers that publish a contract, adopting Circle would move 3701. Median lift: composite +0.0 (90th percentile +0.5), agent readiness +0.0 (+0.0). Conditional rows excluded.
What Circle ships that earns nothing (1)
  • Embedded post comments — It adds Circle comments under a blog the provider already runs; it does not host a blog.

A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact

APIs 8

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

Circle Realtime WebSocket API

Beta ActionCable (Rails) WebSocket surface for realtime chat and notifications, connected at wss://app.circle.so/cable with a member Bearer access token and a whitelisted Origin...

Circle Admin - Courses API

Course sections, lessons, and progress.

Circle Admin - Events API

Events and event attendees.

Circle Admin - Members API

Admin-authenticated community member management.

Circle Admin - Posts API

Posts, comments, and topics.

Circle Admin - Spaces API

Spaces, space groups, and their memberships.

Circle Headless - Auth API

Member JWT token exchange for the Headless Member API.

Circle Headless - Member API

Member-authenticated experience endpoints.

Scroll for all 8

Open Collections 9

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

API Collection

OPEN COLLECTION

Circle Developer Platform Admin - Courses API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Admin - Events API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Admin - Members API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Admin - Posts API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Admin - Spaces API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Headless - Auth API

OPEN COLLECTION

Circle Developer Platform Admin - Courses Headless - Member API

OPEN COLLECTION

Circle Developer Platform API

OPEN COLLECTION

Scroll for all 9

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Circle MCP Server

Remote MCP server at app.circle.so over HTTP.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Circle Community Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Circle Community Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

Circle Community Finops

FINOPS

Event Specifications 1

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

Circle Realtime WebSocket API (Beta)

Circle exposes a documented public WebSocket API for realtime chat and notifications, in beta for customers on the Business plan and above. The transport is ActionCable (Rails' ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Circle API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 2

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

Circle Community Authentication

apiKey/http · 2 schemes

SECURITY

Circle Community Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Circle Community Agentic Access

69 operations · 38 acting

69 operations · 38 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

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 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Other 1

Properties that don't map to a standard resource type

VendorFacets
VendorFacets

Source (apis.yml)

apis.yml Raw ↑ 
aid: circle-community
url: https://raw.githubusercontent.com/api-evangelist/circle-community/refs/heads/main/apis.yml
name: Circle
kind: company
description: 'Circle (circle.so) is an all-in-one community platform for creators, coaches, and brands - hosting discussions,
  courses, events, live streams, memberships, paywalls, and chat under a single branded space. This is the community software
  company at circle.so, NOT the USDC / stablecoin financial-services company. Circle exposes a documented public developer
  platform: an admin-authenticated Admin API (V2) for automations, migrations, and bulk administration; a Headless offering
  (Member API plus Auth API) for embedding Circle features into your own website or app via member-scoped JWT tokens; and
  a beta ActionCable WebSocket surface for realtime chat and notifications. API access is plan-gated to the Business plan
  and above.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/circle-community.png
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-09-21
tags:
- Community
- Creators
- Courses
- Membership
- Event
- Chat
- Community Platform
- Real-Time
tags_raw:
- Community
- Creators
- Courses
- Memberships
- Events
- Chat
- Community Platform
- Real-Time
created: '2026-07-05'
modified: '2026-07-05'
specificationVersion: '0.23'
apis:
- aid: circle-community:circle-community-realtime-websocket-api
  name: Circle Realtime WebSocket API
  tags:
  - WebSocket
  - Real-Time
  - Chat
  - Notification
  - ActionCable
  tags_raw:
  - WebSocket
  - Realtime
  - Chat
  - Notifications
  - ActionCable
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api.circle.so/get-started/websockets-beta
  baseURL: wss://app.circle.so/cable
  properties:
  - url: https://api.circle.so/get-started/websockets-beta
    type: Documentation
  - url: asyncapi/circle-community-asyncapi.yml
    type: AsyncAPI
  description: Beta ActionCable (Rails) WebSocket surface for realtime chat and notifications, connected at wss://app.circle.so/cable
    with a member Bearer access token and a whitelisted Origin header. Exposes a NotificationChannel (new-notification and
    unread-count events) and three chat channels for member-level room updates, room-wide messages, and thread events.
- aid: circle-community:circle-community-admin-courses-api
  name: Circle Admin - Courses API
  description: Course sections, lessons, and progress.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Admin - Courses
  properties:
  - type: OpenAPI
    url: openapi/circle-community-admin-courses-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-admin-events-api
  name: Circle Admin - Events API
  description: Events and event attendees.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Admin - Events
  properties:
  - type: OpenAPI
    url: openapi/circle-community-admin-events-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-admin-members-api
  name: Circle Admin - Members API
  description: Admin-authenticated community member management.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Admin - Members
  properties:
  - type: OpenAPI
    url: openapi/circle-community-admin-members-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-admin-posts-api
  name: Circle Admin - Posts API
  description: Posts, comments, and topics.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Admin - Posts
  properties:
  - type: OpenAPI
    url: openapi/circle-community-admin-posts-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-admin-spaces-api
  name: Circle Admin - Spaces API
  description: Spaces, space groups, and their memberships.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Admin - Spaces
  properties:
  - type: OpenAPI
    url: openapi/circle-community-admin-spaces-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-headless-auth-api
  name: Circle Headless - Auth API
  description: Member JWT token exchange for the Headless Member API.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Headless - Auth
  properties:
  - type: OpenAPI
    url: openapi/circle-community-headless-auth-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
- aid: circle-community:circle-community-headless-member-api
  name: Circle Headless - Member API
  description: Member-authenticated experience endpoints.
  humanURL: https://api.circle.so/apis/admin-api
  baseURL: https://app.circle.so/api/admin/v2
  tags:
  - Headless - Member
  properties:
  - type: OpenAPI
    url: openapi/circle-community-headless-member-api-openapi.yml
  - type: Documentation
    url: https://api.circle.so/apis/admin-api
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Admin+API+V2
  - type: PostmanCollection
    url: collections/circle-community.postman_collection.json
  - type: OpenCollection
    url: collections/circle-community.opencollection.json
  - type: Documentation
    url: https://api.circle.so/apis/headless
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Member+APIs
  - type: Documentation
    url: https://api.circle.so/apis/headless/quick-start
  - type: APIReference
    url: https://api-headless.circle.so/?urls.primaryName=Auth+APIs
common:
- type: VendorFacets
  url: vendor-facets/circle-community-vendor-facets.yml
- type: AgenticAccess
  url: agentic-access/circle-community-agentic-access.yml
- type: DomainSecurity
  url: security/circle-community-domain-security.yml
- type: Authentication
  url: authentication/circle-community-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/circleco
- type: Website
  url: https://circle.so
- type: Documentation
  url: https://api.circle.so
- type: Plans
  url: plans/circle-community-plans-pricing.yml
- type: RateLimits
  url: rate-limits/circle-community-rate-limits.yml
- type: FinOps
  url: finops/circle-community-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/circle-community"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/circle-community/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/circle-community/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.