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 The project is no longer actively maintained (all apiaryio GitHub repos are archived as of 2024) but remains a notable specification in API design history, influencing later formats like OpenAPI.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles API Blueprint the way a machine reads it — 17 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — API Blueprint scores 15.8/100 (emerging), with a separate agent-readiness read of 3/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile API Blueprint
Each block below is one kind of artifact we hold for API Blueprint. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 1
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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...
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Api Blueprint Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Api Blueprint Finops
FINOPSFeatures 5
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
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.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Use Cases 3
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
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 tell you where this provider already fits in a stack.
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
Every other property we hold for API Blueprint — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/api-blueprint · machine-readable index on apis.io
This is an independent, third-party profile of API Blueprint, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.