Pact website screenshot

Pact

Pact is an open source contract testing framework that verifies API consumer-provider interactions with support for Ruby, Java, .NET, JavaScript, Go, and Python. Pact Broker provides a hypermedia-driven HAL API for storing, retrieving, and verifying contracts between services.

Pact publishes 5 APIs on the APIs.io network, including Index API, Pacticipants API, Pacts API, and 2 more. Tagged areas include Contract Testing, Open-Source, and Testing.

Pact’s developer surface includes authentication, documentation, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.0/100 thin ▬ flat Agent 20/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessFreemiumSelf serve⚡ Free to try
1 APIs
Contract TestingOpen-SourceTesting

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 35.0/100 · thin
Contract Quality 9.5 / 20
Developer Ergonomics 4.6 / 16
Access Clarity 2.5 / 16
Operational Transparency 2.7 / 10
Contract Governance 0.0 / 10
Discoverability 4.6 / 8
Open Source Surface 6.5 / 10
Create-or-Update Ergonomics 2.2 / 10
Agent readiness — 20/100 · 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 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 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
Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% 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/pact: 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 6

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

Pact Broker API

Pact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact contract testing framework. It enables teams to share, version, and verif...

Pact Index API

The Index API from Pact — 1 operation(s) for index.

Pact Pacticipants API

The Pacticipants API from Pact — 3 operation(s) for pacticipants.

Pact Pacts API

The Pacts API from Pact — 2 operation(s) for pacts.

Pact Verifications API

The Verifications API from Pact — 1 operation(s) for verifications.

Pact Webhooks API

The Webhooks API from Pact — 1 operation(s) for webhooks.

Open Collections 7

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

API Collection

OPEN COLLECTION

Pact Broker Index API

OPEN COLLECTION

Pact Broker Index Pacticipants API

OPEN COLLECTION

Pact Broker Index Pacts API

OPEN COLLECTION

Pact Broker Index Verifications API

OPEN COLLECTION

Pact Broker Index Webhooks API

OPEN COLLECTION

Pact Broker API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Pact Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Pact Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Pact Finops

FINOPS

Security Posture 2

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

Pact Authentication

http · 1 scheme

SECURITY

Pact Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Pact Agentic Access

11 operations · 4 acting

11 operations · 4 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide
ContributionGuide
 Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct
CodeOfConduct
 GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 Releases
Releases
 Slack
Slack

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: pact
name: Pact
description: Pact is an open source contract testing framework that verifies API consumer-provider interactions with support
  for Ruby, Java, .NET, JavaScript, Go, and Python. Pact Broker provides a hypermedia-driven HAL API for storing, retrieving,
  and verifying contracts between services.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  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/pact.png
tags:
- Contract Testing
- Open-Source
- Testing
tags_raw:
- Contract Testing
- Open Source
- Testing
url: https://raw.githubusercontent.com/api-evangelist/pact/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-04-28'
position: Consuming
access: 3rd-Party
specificationVersion: '0.23'
apis:
- aid: pact:pact-broker
  name: Pact Broker API
  description: Pact Broker is a hypermedia HAL API for storing and retrieving consumer contracts created with the Pact contract
    testing framework. It enables teams to share, version, and verify pacts between consumers and providers.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Contract Testing
  - Testing
  properties:
  - type: Documentation
    url: https://docs.pact.io/pact_broker
  - type: GitHubRepository
    url: https://github.com/pact-foundation/pact_broker
  - type: Hosted Service
    url: https://pactflow.io
- aid: pact:pact-index-api
  name: Pact Index API
  description: The Index API from Pact — 1 operation(s) for index.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Index
  properties:
  - type: OpenAPI
    url: openapi/pact-index-api-openapi.yml
- aid: pact:pact-pacticipants-api
  name: Pact Pacticipants API
  description: The Pacticipants API from Pact — 3 operation(s) for pacticipants.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Pacticipants
  properties:
  - type: OpenAPI
    url: openapi/pact-pacticipants-api-openapi.yml
- aid: pact:pact-pacts-api
  name: Pact Pacts API
  description: The Pacts API from Pact — 2 operation(s) for pacts.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Pacts
  properties:
  - type: OpenAPI
    url: openapi/pact-pacts-api-openapi.yml
- aid: pact:pact-verifications-api
  name: Pact Verifications API
  description: The Verifications API from Pact — 1 operation(s) for verifications.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Verification
  tags_raw:
  - Verifications
  properties:
  - type: OpenAPI
    url: openapi/pact-verifications-api-openapi.yml
- aid: pact:pact-webhooks-api
  name: Pact Webhooks API
  description: The Webhooks API from Pact — 1 operation(s) for webhooks.
  humanURL: https://docs.pact.io/pact_broker
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/pact-webhooks-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/pact-foundation/pact_broker/issues
- type: Releases
  url: https://github.com/pact-foundation/pact_broker/releases
- type: CodeOfConduct
  url: https://github.com/pact-foundation/pact_broker/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/pact-foundation/pact_broker/blob/master/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/pact-foundation/pact_broker/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/pact-agentic-access.yml
- type: DomainSecurity
  url: security/pact-domain-security.yml
- type: Authentication
  url: authentication/pact-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/pact
- type: Website
  url: https://pact.io
- type: Documentation
  url: https://docs.pact.io
- type: GitHubOrganization
  url: https://github.com/pact-foundation
- type: Slack
  url: https://pact-foundation.slack.com
- type: Blog
  url: https://docs.pact.io/blog
- type: LlmsText
  url: https://docs.pact.io/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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