CircleCI

CircleCI is a continuous integration and continuous delivery (CI/CD) platform that automates software build, test, and deployment pipelines. Their developer surface includes the REST API v2 (the recommended modern interface), the legacy v1 REST API, a Self-Hosted Runner API, webhooks for real-time event notifications, and the Orbs Registry of reusable configuration packages. Authentication is via a personal or project Circle-Token sent in the Circle-Token header; responses are JSON.

CircleCI publishes 17 APIs on the APIs.io network, including Self-Hosted Runner API, Webhooks, Artifact API, and 14 more. Tagged areas include CI/CD, Continuous Integration, Continuous Deployment, DevOps, and Pipelines.

The CircleCI catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.

CircleCI’s developer surface includes authentication, developer portal, documentation, support, engineering blog, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub

49.6/100 developing ▬ flat Agent 28/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

2 APIs 16 Features

CI/CD Continuous Integration Continuous Deployment DevOps Pipelines Workflows

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 49.6/100 · developing

Contract Quality 15.6 / 23

Developer Ergonomics 7.1 / 18

Access Clarity 9.2 / 18

Operational Transparency 3.1 / 12

Contract Governance 1.5 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 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 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

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.

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/circleci: 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 →

APIs 18

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

CircleCI Self-Hosted Runner API

The CircleCI Self-Hosted Runner API enables management and execution of jobs on self-hosted runner infrastructure. It provides endpoints for listing available runners, managing ...

CircleCI Webhooks

CircleCI Webhooks allow developers to receive real-time notifications about events in their CI/CD pipelines by configuring HTTP callbacks. Webhooks can be set up through project...

CircleCI Orbs Registry

CircleCI Orbs are shareable, reusable packages of CircleCI configuration that simplify build setup and integration with third-party tools. The Orbs Registry on the CircleCI Deve...

CircleCI Artifact API

Endpoints for listing and downloading build artifacts.

CircleCI Build API

Endpoints for retrieving build details, triggering builds, retrying builds, and canceling builds.

CircleCI Context API

Endpoints for managing contexts, which are used to secure and share environment variables across projects.

CircleCI Insights API

Endpoints for retrieving workflow and job metrics, summary data, and test performance insights.

CircleCI Job API

Endpoints for retrieving job details, artifacts, and test metadata associated with pipeline jobs.

CircleCI Pipeline API

Endpoints for triggering, retrieving, and managing pipelines and their configurations.

CircleCI Project API

Endpoints for listing followed projects and managing project settings.

CircleCI Resource Class API

Endpoints for managing runner resource classes, which define the compute resources available for self-hosted runner jobs.

CircleCI Runner Task API

Endpoints for querying task counts and managing tasks assigned to self-hosted runners.

CircleCI Schedule API

Endpoints for creating, updating, and managing scheduled pipeline triggers.

CircleCI SSH Key API

Endpoints for managing SSH keys and checkout keys for projects.

CircleCI Test Metadata API

Endpoints for retrieving test metadata collected during builds.

CircleCI User API

Endpoints for retrieving information about the authenticated user.

CircleCI Webhook API

Endpoints for creating, updating, listing, and deleting outbound webhook subscriptions.

CircleCI Workflow API

Endpoints for retrieving workflow details, managing workflow status, and rerunning workflows.

Scroll for all 18

CircleCI REST API v1 Artifact Workflow API

POSTMAN

OPEN COLLECTION

Scroll for all 19

Pricing Plans 1

Published pricing tiers and plan structures.

Circleci Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Circleci Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

Circleci Finops

FINOPS

Features 16

Notable capabilities this provider offers.

Free: 30K credits/mo, 6K build minutes, 5 active users

Performance from $15/mo: 30K credits + $15/25K credits, 80x concurrency

Scale: custom annual, 200 GB storage, GPU, SSO, config policies

REST API v2 at circleci.com/api/v2

Default 3,000 req/min API rate limit

Self-hosted runners (Linux, Windows, macOS, Arm)

Docker layer caching (Performance+)

Orbs marketplace for reusable config

Webhooks for pipeline events

OAuth 2.0 + personal API tokens

Test splitting and parallel execution

GPU executors (Scale)

Insights API for build analytics

OIDC token federation for cloud auth

Config policies for governance (Scale)

SOC 2, FedRAMP Moderate (Scale)

Scroll for all 16

Event Specifications 1

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

CircleCI Webhooks

CircleCI Webhooks allow developers to receive real-time notifications about events in their CI/CD pipelines by configuring HTTP callbacks. Webhooks can be set up through project...

ASYNCAPI

Semantic Vocabularies 1

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

Circleci Context

0 classes · 10 properties

JSON-LD

Spectral Rules 3

Spectral governance rulesets for linting and validating these APIs.

CircleCI API Rules

5 rules · 1 errors 4 warnings

SPECTRAL

CircleCI API Rules

6 rules · 5 warnings 1 info

SPECTRAL

CircleCI API Rules

10 rules · 4 errors 5 warnings 1 info

SPECTRAL

2 properties

JSON SCHEMA

WorkflowList

2 properties

JSON SCHEMA

Scroll for all 49

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Circleci Structure

0 properties

JSON STRUCTURE

Security Posture 4

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

Circleci Authentication

apiKey/http · 3 schemes

SECURITY

Circleci Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Circleci Vulnerability Disclosure

security.txt · contact published

SECURITY

Circleci Trust Center

SOC 2, FedRAMP, GDPR, CSA STAR

SECURITY

Agentic Access 1

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

Circleci Agentic Access

74 operations · 30 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Login

Documentation 4

Reference material describing how the API behaves

Documentation

JSONSchema

JSONSchema

JSONSchema

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Spectral

Spectral

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: circleci
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/circleci.png
name: CircleCI
url: https://raw.githubusercontent.com/api-evangelist/circleci/refs/heads/main/apis.yml
created: '2025-03-05'
modified: '2026-05-19'
type: Index
access: 3rd-Party
position: Consuming
specificationVersion: '0.23'
tags:
- CI/CD
- Continuous Integration
- Continuous Deployment
- DevOps
- Pipelines
- Workflows
description: CircleCI is a continuous integration and continuous delivery (CI/CD) platform that automates software build,
  test, and deployment pipelines. Their developer surface includes the REST API v2 (the recommended modern interface), the
  legacy v1 REST API, a Self-Hosted Runner API, webhooks for real-time event notifications, and the Orbs Registry of reusable
  configuration packages. Authentication is via a personal or project Circle-Token sent in the Circle-Token header; responses
  are JSON.
apis:
- aid: circleci:runner-api
  name: CircleCI Self-Hosted Runner API
  tags:
  - CI/CD
  - Infrastructure
  - Runners
  - Self-Hosted
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://runner.circleci.com
  humanURL: https://circleci.com/docs/runner-api/
  properties:
  - url: https://circleci.com/docs/runner-api/
    type: Documentation
  - url: openapi/circleci-runner-api-openapi.yml
    type: OpenAPI
  description: The CircleCI Self-Hosted Runner API enables management and execution of jobs on self-hosted runner infrastructure.
    It provides endpoints for listing available runners, managing runner tasks, and querying resource classes. The API is
    hosted separately from the main CircleCI API at runner.circleci.com and supports multiple authentication methods depending
    on the endpoint. Developers can use this API to integrate self-hosted runner management into their infrastructure automation
    workflows.
- aid: circleci:webhooks
  name: CircleCI Webhooks
  tags:
  - CI/CD
  - Event
  - Notification
  - Webhook
  tags_raw:
  - CI/CD
  - Events
  - Notifications
  - Webhooks
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://api.example.com
  humanURL: https://circleci.com/docs/webhooks/
  properties:
  - url: https://circleci.com/docs/webhooks/
    type: Documentation
  - url: asyncapi/circleci-webhooks-asyncapi.yml
    type: AsyncAPI
  description: CircleCI Webhooks allow developers to receive real-time notifications about events in their CI/CD pipelines
    by configuring HTTP callbacks. Webhooks can be set up through project settings to notify external services when workflows
    and jobs complete, fail, or change status. This enables integration with monitoring systems, chat platforms, and custom
    automation workflows. Webhooks deliver JSON payloads containing event details to configured endpoint URLs.
- aid: circleci:orbs
  name: CircleCI Orbs Registry
  tags:
  - CI/CD
  - Configuration
  - Packages
  - Reusable
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://api.example.com
  humanURL: https://circleci.com/developer/orbs
  properties:
  - url: https://circleci.com/developer/orbs
    type: Documentation
  description: CircleCI Orbs are shareable, reusable packages of CircleCI configuration that simplify build setup and integration
    with third-party tools. The Orbs Registry on the CircleCI Developer Hub provides a searchable catalog of community and
    certified orbs. Developers can browse, publish, and consume orbs to automate repeated processes, speed up project configuration,
    and integrate services like AWS, Docker, Slack, and Kubernetes into their CI/CD pipelines.
- aid: circleci:circleci-artifact-api
  name: CircleCI Artifact API
  description: Endpoints for listing and downloading build artifacts.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Artifact
  properties:
  - type: OpenAPI
    url: openapi/circleci-artifact-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-build-api
  name: CircleCI Build API
  description: Endpoints for retrieving build details, triggering builds, retrying builds, and canceling builds.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Builds
  tags_raw:
  - Build
  properties:
  - type: OpenAPI
    url: openapi/circleci-build-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-context-api
  name: CircleCI Context API
  description: Endpoints for managing contexts, which are used to secure and share environment variables across projects.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Context
  properties:
  - type: OpenAPI
    url: openapi/circleci-context-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-insights-api
  name: CircleCI Insights API
  description: Endpoints for retrieving workflow and job metrics, summary data, and test performance insights.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Insights
  properties:
  - type: OpenAPI
    url: openapi/circleci-insights-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-job-api
  name: CircleCI Job API
  description: Endpoints for retrieving job details, artifacts, and test metadata associated with pipeline jobs.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Job
  properties:
  - type: OpenAPI
    url: openapi/circleci-job-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-pipeline-api
  name: CircleCI Pipeline API
  description: Endpoints for triggering, retrieving, and managing pipelines and their configurations.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Pipeline
  properties:
  - type: OpenAPI
    url: openapi/circleci-pipeline-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-project-api
  name: CircleCI Project API
  description: Endpoints for listing followed projects and managing project settings.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Project
  properties:
  - type: OpenAPI
    url: openapi/circleci-project-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-resource-class-api
  name: CircleCI Resource Class API
  description: Endpoints for managing runner resource classes, which define the compute resources available for self-hosted
    runner jobs.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Resource Class
  properties:
  - type: OpenAPI
    url: openapi/circleci-resource-class-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-runner-task-api
  name: CircleCI Runner Task API
  description: Endpoints for querying task counts and managing tasks assigned to self-hosted runners.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Runner Task
  properties:
  - type: OpenAPI
    url: openapi/circleci-runner-task-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-schedule-api
  name: CircleCI Schedule API
  description: Endpoints for creating, updating, and managing scheduled pipeline triggers.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Schedule
  properties:
  - type: OpenAPI
    url: openapi/circleci-schedule-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-ssh-key-api
  name: CircleCI SSH Key API
  description: Endpoints for managing SSH keys and checkout keys for projects.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - SSH Key
  properties:
  - type: OpenAPI
    url: openapi/circleci-ssh-key-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-test-metadata-api
  name: CircleCI Test Metadata API
  description: Endpoints for retrieving test metadata collected during builds.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Test Metadata
  properties:
  - type: OpenAPI
    url: openapi/circleci-test-metadata-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-user-api
  name: CircleCI User API
  description: Endpoints for retrieving information about the authenticated user.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/circleci-user-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-webhook-api
  name: CircleCI Webhook API
  description: Endpoints for creating, updating, listing, and deleting outbound webhook subscriptions.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Webhook
  properties:
  - type: OpenAPI
    url: openapi/circleci-webhook-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
- aid: circleci:circleci-workflow-api
  name: CircleCI Workflow API
  description: Endpoints for retrieving workflow details, managing workflow status, and rerunning workflows.
  humanURL: https://circleci.com/docs/api/v2/
  baseURL: https://circleci.com/api/v2
  tags:
  - Workflows
  tags_raw:
  - Workflow
  properties:
  - type: OpenAPI
    url: openapi/circleci-workflow-api-openapi.yml
  - type: Documentation
    url: https://circleci.com/docs/api/v2/
  - type: Documentation
    url: https://circleci.com/docs/api/v1/
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/circleci/overview
- type: AgenticAccess
  url: agentic-access/circleci-agentic-access.yml
- type: TrustCenter
  url: security/circleci-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/circleci-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/circleci-domain-security.yml
- type: Authentication
  url: authentication/circleci-authentication.yml
- type: GitHubOrganization
  url: https://github.com/circleci
- type: LinkedIn
  url: https://www.linkedin.com/company/circleci
- type: Website
  url: https://circleci.com/
- type: Portal
  url: https://circleci.com/developer
- type: Documentation
  url: https://circleci.com/docs/
- type: StatusPage
  url: https://status.circleci.com/
- type: Support
  url: https://support.circleci.com/
- type: Blog
  url: https://circleci.com/blog/
- type: PrivacyPolicy
  url: https://circleci.com/privacy/
- type: TermsOfService
  url: https://circleci.com/terms-of-service/
- type: Login
  url: https://app.circleci.com/
- type: JSONLD
  url: json-ld/circleci-context.jsonld
- type: JSONSchema
  url: json-schema/circleci-pipeline-schema.json
- type: JSONSchema
  url: json-schema/circleci-workflow-schema.json
- type: JSONSchema
  url: json-schema/circleci-webhook-event-schema.json
- type: Spectral
  url: rules/circleci-rules.yml
- type: Features
  data:
  - 'Free: 30K credits/mo, 6K build minutes, 5 active users'
  - 'Performance from $15/mo: 30K credits + $15/25K credits, 80x concurrency'
  - 'Scale: custom annual, 200 GB storage, GPU, SSO, config policies'
  - REST API v2 at circleci.com/api/v2
  - Default 3,000 req/min API rate limit
  - Self-hosted runners (Linux, Windows, macOS, Arm)
  - Docker layer caching (Performance+)
  - Orbs marketplace for reusable config
  - Webhooks for pipeline events
  - OAuth 2.0 + personal API tokens
  - Test splitting and parallel execution
  - GPU executors (Scale)
  - Insights API for build analytics
  - OIDC token federation for cloud auth
  - Config policies for governance (Scale)
  - SOC 2, FedRAMP Moderate (Scale)
  sources:
  - https://circleci.com/pricing/
  updated: '2026-05-04'
- type: Integrations
  url: https://circleci.com/integrations/
- type: LlmsText
  url: https://circleci.com/llms.txt
integrations:
- name: GitHub
- name: GitLab
- name: Bitbucket
- name: AWS
- name: GCP
- name: Azure
- name: Kubernetes
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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