API Blueprint

API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenting, and prototyping web APIs. Created by Apiary and released under the MIT License, API Blueprint uses .apib files with a concise Markdown format that makes APIs accessible to both technical and non-technical stakeholders. The project is no longer actively maintained (all apiaryio GitHub repos are archived as of 2024) but remains a notable specification in API design history, influencing later formats like OpenAPI.

API Blueprint publishes 6 API contracts indexed on the APIs.io network, including Composer API, Parser API, Service Root API, and 3 more. Tagged areas include API Design, Specification Language, Markdown, Documentation, and API Description Language.

The API Blueprint catalog on APIs.io includes 1 Spectral governance ruleset.

API Blueprint’s developer surface includes documentation, CLI, changelog, support, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.7/100 developing ▬ flat Agent 30/100 agent ready Front door AI 1/6 silent Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidOpen

1 published contract 3 Agent Skills 5 Features 3 Use Cases

API Design Specification Language Markdown DocumentationAPI Description LanguageParsing Open Source Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 39.7/100 · developing

Contract Quality 9.8 / 19

Developer Ergonomics 10.6 / 15

Access Clarity 1.6 / 15

Operational Transparency 1.8 / 10

Contract Governance 1.6 / 9

Discoverability 4.3 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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.

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/.

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 10.5 — up to +17.9 composite points
Contract Quality scores 52.3 — up to +11.9 composite points
Operational Transparency scores 18.4 — up to +10.6 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/api-blueprint/apis.yml: open an issue on github.com/api-evangelist/api-blueprint 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 2

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.

Markdown

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

API Blueprint

API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenting, and prototyping APIs. Files use the .apib extension with media typ...

API Blueprint Composer API

Compose an API description format from API Elements.

API Blueprint Parser API

Parse an API description format into API Elements.

API Blueprint Service Root API

Entry point listing the available affordances.

API Blueprint Transform API

Convert an API description between formats through a JSON envelope. Advertised by the live service root; absent from the provider's published contract.

API Blueprint Validate API

Validate an API description and return its annotations. Advertised by the live service root; absent from the provider's published contract.

Agent Skills 3

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

Convert between API description formats

AGENT SKILL

Parse an API description into API Elements

AGENT SKILL

Validate an API description and read its annotations

AGENT SKILL

API Blueprint pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Api Blueprint Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Api Blueprint Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Api Blueprint Finops

FINOPS

Features 5

Notable capabilities this provider offers.

Markdown-Based Syntax

API Blueprint uses concise Markdown syntax making API descriptions readable by both developers and non-technical stakeholders. Files use the .apib extension with media type text...

Data Structure Modeling

Supports reusable data structure definitions using MSON (Markdown Syntax for Object Notation) for describing complex request and response schemas.

Mock Server Generation

API Blueprint documents can drive mock server generation for rapid prototyping and front-end development before backend implementation.

Testing with Dredd

The Dredd HTTP testing tool uses API Blueprint specs to run contract tests validating that API implementations match their documented contracts.

RFC-Driven Governance

API Blueprint evolution was governed through an RFC process similar to Rust and Django, with proposals submitted to the api-blueprint-rfcs repository.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

API Blueprint API Rules

66 rules · 61 errors 1 warnings 4 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Api Blueprint Parsing Service Overlay

6 actions · update · api-blueprint-parsing-service-openapi.yml

DERIVED

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Api Blueprint Api Elements Element

0 properties

JSON SCHEMA

Security Posture 2

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

Api Blueprint Authentication

0 schemes

SECURITY

Api Blueprint Domain Security

TLSv1.3 · DMARC

SECURITY

Use Cases 3

What developers build with this provider.

API Documentation

Write human-readable API documentation in Markdown that doubles as a machine-parseable specification for tooling.

Contract Testing

Use API Blueprint specs with Dredd to verify that API implementations conform to their documented contracts in CI pipelines.

API Prototyping

Rapidly prototype APIs by writing Blueprint specs first, then generating mock servers from the specification.

Integrations 4

Pre-built integrations with other platforms and tools.

Apiary

API Blueprint was the native specification format of the Apiary platform (acquired by Oracle), which provided hosted documentation, mock servers, and testing.

Drafter Parser

The canonical API Blueprint parser written in C++ with bindings for Node.js (drafter.js, drafter-npm) and other languages.

Dredd Testing Framework

Language-agnostic HTTP API testing tool that validates live API implementations against API Blueprint or Swagger/OpenAPI specs.

Swagger Conversion

The swagger2blueprint tool converted Swagger API descriptions into API Blueprint format for migration workflows.

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Reference

Reference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Lifecycle

Lifecycle

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

SourceCode

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

Tutorials

Tutorials

Operate 5

Status, limits, changes, and where to get help

IssueTracker

Releases

ChangeLog

RateLimits

Support

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: api-blueprint
name: API Blueprint
description: API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenting,
  and prototyping web APIs. Created by Apiary and released under the MIT License, API Blueprint uses .apib files with a concise
  Markdown format that makes APIs accessible to both technical and non-technical stakeholders. The project is no longer actively
  maintained (all apiaryio GitHub repos are archived as of 2024) but remains a notable specification in API design history,
  influencing later formats like OpenAPI.
type: Index
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - pricing
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Paid · Open access
  confidence: high
  source:
  - finops
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/api-blueprint.png
tags:
- API Design
- Specification Language
- Markdown
- Documentation
- API Description Language
- Parsing
- Open Source
- Developer Tools
tags_raw:
- API Design
- Specification Language
- Markdown
- Documentation
- API Description Language
- Parsing
- Open Source
- Developer Tools
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/api-blueprint/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-09-02'
specificationVersion: '0.23'
apis:
- aid: api-blueprint:api-blueprint
  name: API Blueprint
  description: API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenting,
    and prototyping APIs. Files use the .apib extension with media type text/vnd.apiblueprint. The project was archived in
    2024 after being developed by Apiary (acquired by Oracle).
  humanURL: https://apiblueprint.org
  tags:
  - API Design
  - Specification Language
  - Markdown
  properties:
  - type: Documentation
    url: https://apiblueprint.org/documentation/
  - type: GitHubRepository
    url: https://github.com/apiaryio/api-blueprint
  - type: Specification
    url: https://github.com/apiaryio/api-blueprint/blob/master/API%20Blueprint%20Specification.md
  - type: GettingStarted
    url: https://apiblueprint.org/documentation/tutorial.html
- aid: api-blueprint:api-blueprint-composer-api
  name: API Blueprint Composer API
  description: Compose an API description format from API Elements.
  humanURL: https://apiblueprint.org
  baseURL: https://api.apiblueprint.org
  tags:
  - Composer
  properties:
  - type: OpenAPI
    url: openapi/api-blueprint-composer-api-openapi.yml
  - type: APIBlueprint
    url: apib/api-blueprint-api.apib
  - type: Documentation
    url: https://apiblueprintapi.docs.apiary.io/
  - type: SourceCode
    url: https://github.com/apiaryio/api.apiblueprint.org
  - type: Authentication
    url: authentication/api-blueprint-authentication.yml
  - type: ErrorCatalog
    url: errors/api-blueprint-problem-types.yml
  - type: Conventions
    url: conventions/api-blueprint-conventions.yml
  - type: DataModel
    url: data-model/api-blueprint-data-model.yml
  - type: JSONSchema
    url: json-schema/api-blueprint-api-elements-element-schema.json
- aid: api-blueprint:api-blueprint-parser-api
  name: API Blueprint Parser API
  description: Parse an API description format into API Elements.
  humanURL: https://apiblueprint.org
  baseURL: https://api.apiblueprint.org
  tags:
  - Parser
  properties:
  - type: OpenAPI
    url: openapi/api-blueprint-parser-api-openapi.yml
  - type: APIBlueprint
    url: apib/api-blueprint-api.apib
  - type: Documentation
    url: https://apiblueprintapi.docs.apiary.io/
  - type: SourceCode
    url: https://github.com/apiaryio/api.apiblueprint.org
  - type: Authentication
    url: authentication/api-blueprint-authentication.yml
  - type: ErrorCatalog
    url: errors/api-blueprint-problem-types.yml
  - type: Conventions
    url: conventions/api-blueprint-conventions.yml
  - type: DataModel
    url: data-model/api-blueprint-data-model.yml
  - type: JSONSchema
    url: json-schema/api-blueprint-api-elements-element-schema.json
- aid: api-blueprint:api-blueprint-service-root-api
  name: API Blueprint Service Root API
  description: Entry point listing the available affordances.
  humanURL: https://apiblueprint.org
  baseURL: https://api.apiblueprint.org
  tags:
  - Service Root
  properties:
  - type: OpenAPI
    url: openapi/api-blueprint-service-root-api-openapi.yml
  - type: APIBlueprint
    url: apib/api-blueprint-api.apib
  - type: Documentation
    url: https://apiblueprintapi.docs.apiary.io/
  - type: SourceCode
    url: https://github.com/apiaryio/api.apiblueprint.org
  - type: Authentication
    url: authentication/api-blueprint-authentication.yml
  - type: ErrorCatalog
    url: errors/api-blueprint-problem-types.yml
  - type: Conventions
    url: conventions/api-blueprint-conventions.yml
  - type: DataModel
    url: data-model/api-blueprint-data-model.yml
  - type: JSONSchema
    url: json-schema/api-blueprint-api-elements-element-schema.json
- aid: api-blueprint:api-blueprint-transform-api
  name: API Blueprint Transform API
  description: Convert an API description between formats through a JSON envelope. Advertised by the live service root; absent
    from the provider's published contract.
  humanURL: https://apiblueprint.org
  baseURL: https://api.apiblueprint.org
  tags:
  - Transforms
  tags_raw:
  - Transform
  properties:
  - type: OpenAPI
    url: openapi/api-blueprint-transform-api-openapi.yml
  - type: APIBlueprint
    url: apib/api-blueprint-api.apib
  - type: Documentation
    url: https://apiblueprintapi.docs.apiary.io/
  - type: SourceCode
    url: https://github.com/apiaryio/api.apiblueprint.org
  - type: Authentication
    url: authentication/api-blueprint-authentication.yml
  - type: ErrorCatalog
    url: errors/api-blueprint-problem-types.yml
  - type: Conventions
    url: conventions/api-blueprint-conventions.yml
  - type: DataModel
    url: data-model/api-blueprint-data-model.yml
  - type: JSONSchema
    url: json-schema/api-blueprint-api-elements-element-schema.json
- aid: api-blueprint:api-blueprint-validate-api
  name: API Blueprint Validate API
  description: Validate an API description and return its annotations. Advertised by the live service root; absent from the
    provider's published contract.
  humanURL: https://apiblueprint.org
  baseURL: https://api.apiblueprint.org
  tags:
  - Validate
  properties:
  - type: OpenAPI
    url: openapi/api-blueprint-validate-api-openapi.yml
  - type: APIBlueprint
    url: apib/api-blueprint-api.apib
  - type: Documentation
    url: https://apiblueprintapi.docs.apiary.io/
  - type: SourceCode
    url: https://github.com/apiaryio/api.apiblueprint.org
  - type: Authentication
    url: authentication/api-blueprint-authentication.yml
  - type: ErrorCatalog
    url: errors/api-blueprint-problem-types.yml
  - type: Conventions
    url: conventions/api-blueprint-conventions.yml
  - type: DataModel
    url: data-model/api-blueprint-data-model.yml
  - type: JSONSchema
    url: json-schema/api-blueprint-api-elements-element-schema.json
common:
- type: Overlay
  url: overlays/api-blueprint-parsing-service-overlay.yaml
- type: IssueTracker
  url: https://github.com/apiaryio/api-blueprint/issues
- type: Releases
  url: https://github.com/apiaryio/api-blueprint/releases
- type: DomainSecurity
  url: security/api-blueprint-domain-security.yml
- type: Website
  url: https://apiblueprint.org
- type: Documentation
  url: https://apiblueprint.org/documentation/
- type: GitHubOrganization
  url: https://github.com/apiaryio
- type: TermsOfService
  url: https://github.com/apiaryio/api-blueprint/blob/master/LICENSE
- type: Features
  data:
  - name: Markdown-Based Syntax
    description: API Blueprint uses concise Markdown syntax making API descriptions readable by both developers and non-technical
      stakeholders. Files use the .apib extension with media type text/vnd.apiblueprint.
  - name: Data Structure Modeling
    description: Supports reusable data structure definitions using MSON (Markdown Syntax for Object Notation) for describing
      complex request and response schemas.
  - name: Mock Server Generation
    description: API Blueprint documents can drive mock server generation for rapid prototyping and front-end development
      before backend implementation.
  - name: Testing with Dredd
    description: The Dredd HTTP testing tool uses API Blueprint specs to run contract tests validating that API implementations
      match their documented contracts.
  - name: RFC-Driven Governance
    description: API Blueprint evolution was governed through an RFC process similar to Rust and Django, with proposals submitted
      to the api-blueprint-rfcs repository.
- type: UseCases
  data:
  - name: API Documentation
    description: Write human-readable API documentation in Markdown that doubles as a machine-parseable specification for
      tooling.
  - name: Contract Testing
    description: Use API Blueprint specs with Dredd to verify that API implementations conform to their documented contracts
      in CI pipelines.
  - name: API Prototyping
    description: Rapidly prototype APIs by writing Blueprint specs first, then generating mock servers from the specification.
- type: Integrations
  data:
  - name: Apiary
    description: API Blueprint was the native specification format of the Apiary platform (acquired by Oracle), which provided
      hosted documentation, mock servers, and testing.
  - name: Drafter Parser
    description: The canonical API Blueprint parser written in C++ with bindings for Node.js (drafter.js, drafter-npm) and
      other languages.
  - name: Dredd Testing Framework
    description: Language-agnostic HTTP API testing tool that validates live API implementations against API Blueprint or
      Swagger/OpenAPI specs.
  - name: Swagger Conversion
    description: The swagger2blueprint tool converted Swagger API descriptions into API Blueprint format for migration workflows.
- type: Packages
  url: packages/api-blueprint-packages.yml
- type: SDKs
  url: packages/api-blueprint-packages.yml
- type: CLI
  url: cli/api-blueprint-cli.yml
- type: LLMsTxt
  url: llms/api-blueprint-llms.txt
- type: Conformance
  url: conformance/api-blueprint-conformance.yml
- type: Lifecycle
  url: lifecycle/api-blueprint-lifecycle.yml
- type: ChangeLog
  url: changelog/api-blueprint-changelog.yml
- type: Plans
  url: plans/api-blueprint-plans-pricing.yml
- type: RateLimits
  url: rate-limits/api-blueprint-rate-limits.yml
- type: X-MCPServerCandidate
  url: mcp/api-blueprint-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: FinOps
  url: finops/api-blueprint-finops.yml
- type: DeveloperPortal
  url: https://apiblueprint.org/developers.html
- type: Support
  url: https://apiblueprint.org/support.html
- type: Tutorials
  url: https://apiblueprint.org/documentation/tutorial.html
- type: Reference
  url: https://apiblueprint.org/documentation/specification.html
- type: SourceCode
  url: https://github.com/apiaryio/api-blueprint
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-09-02'
  status: enriched
  artifacts_added: 24
  pass: local-v1

API Blueprint — frequently asked questions

Does API Blueprint have an API?

Yes. APIs.io lists 6 APIs from API Blueprint, including API Blueprint, API Blueprint Composer API and API Blueprint Parser API, and 3 more.

Is there an OpenAPI specification for the API Blueprint?

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

How do I authenticate with the API Blueprint?

API Blueprint uses bearer-token authentication (0 schemes). The details are profiled on APIs.io as Api Blueprint Authentication.

Is the API Blueprint ready for AI agents?

API Blueprint has a Kin Score of 39.7 out of 100 (developing) and an Agent Readiness score of 29.7 (agent-ready), scored by API Evangelist on 2026-11-06.

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