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 6 API contracts indexed on the APIs.io network, including Index API, Pacticipants API, Pacts API, and 3 more. Tagged areas include Contract Testing, Open Source, and Testing.

The Pact catalog on APIs.io includes 1 Spectral governance ruleset.

Pact’s developer surface includes authentication, documentation, engineering blog, and 16 more developer resources.

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32.1/100 thin ▬ flat Agent 20/100 agent aware Front door AI 2/6 trace Heartbeat 98/100 alive self hosted · MIT Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Contract Testing Open Source Testing

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Software Product Engineering Management

BC-4200

PactsVerifications

POST /verification-results PUT /pacts/provider/{provider}/consumer/{consumer}/version/{version}

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 32.1/100 · thin

Contract Quality 7.0 / 16

Developer Ergonomics 3.7 / 13

Access Clarity 0.8 / 13

Operational Transparency 2.2 / 8

Contract Governance 1.1 / 8

Discoverability 3.6 / 7

Regulatory Posture 0.9 / 15

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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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.

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 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% 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 Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 28.6 — up to +14.3 composite points Ask about this →
Contract Quality scores 42.9 — up to +14.3 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/pact/apis.yml: open an issue on github.com/api-evangelist/pact 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

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 6

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

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

Pact API pricing

Not yet checked against Pact's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Pact's documentation. All 5 limits →

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

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Pact API Rules

48 rules · 46 error-severity 1 warn-severity 1 info-severity

SPECTRAL

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 (API Evangelist recommendations) 1

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

Pact Agentic Access

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 4

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Slack

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/pact.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: netlify
tags:
- Contract Testing
- Open Source
- Testing
tags_raw:
- Contract Testing
- Open Source
- Testing
- Open-Source
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: Plans
  url: plans/pact-plans-pricing.yml
- type: RateLimits
  url: rate-limits/pact-rate-limits.yml
- type: FinOps
  url: finops/pact-finops.yml
- type: CapabilityMap
  url: capabilities/pact-capability-edges.yml
  name: Pact Business Capability Map
- 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

Pact API — frequently asked questions

Does Pact have an API?

Yes. APIs.io lists 6 APIs from Pact, including Pact Broker API, Pact Index API and Pact Pacticipants API, and 3 more.

Is there an OpenAPI specification for the Pact API?

Yes. APIs.io indexes 5 OpenAPI specifications for Pact, each linked for download from this page.

How do I authenticate with the Pact API?

Pact uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Pact Authentication.

How much does the Pact API cost?

APIs.io lists 3 pricing plans for Pact, with each plan's price, limits and inclusions under Pricing on this page.

Is the Pact API ready for AI agents?

Pact has a Kin Score of 32.1 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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