# Hypermedia

**Canonical:** https://apis.io/providers/hypermedia/  
**Website:** https://apievangelist.com  
**APIs profiled:** 0

An index and topic collection covering hypermedia-driven APIs, HATEOAS, and the formats, link relations, and specifications that make APIs discoverable and self-describing. Hypermedia APIs use links, link relations, and embedded controls inside their responses so that clients can navigate an API graph at runtime rather than relying on hard-coded URI structures. This collection covers hypermedia formats including HAL, JSON:API, Siren, Collection+JSON, JSON-LD, Hydra, ALPS, UBER, Mason, and Verbose; the standards bodies that define web linking (IETF, W3C) including RFC 5988/8288 Web Linking and RFC 9264 api-catalog; provider APIs that demonstrably ship HATEOAS responses such as OpenProject, Reverb, MBTA, Patreon, Teamtailor, and Drupal JSON:API; and the spec libraries and frameworks (Spring HATEOAS, Spring Data REST, Apicurio) that implement hypermedia patterns.

## Kin Score — 9.6 / 100 (minimal)

Scored 2026-10-17 under rubric 0.24.0. Trend: flat (+0.1 from 9.5).

| Facet | Score |
|---|---|
| Discoverability | 48.2 |
| Contract Quality | 14.7 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 9.5 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 4.9 (matched via fallback).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Use cases (6)

- **Evolvable Long-Lived APIs** — HATEOAS-based APIs allow servers to evolve URI structures, add new affordances, and deprecate endpoints over time while clients continue to navigate by link relations rather tha...
- **Domain-Driven Project Management APIs** — OpenProject exposes work packages, projects, users, and attachments through a HAL+JSON hypermedia API where every resource embeds links to related resources and available actions.
- **Standardized CRUD via JSON:API** — Patreon, MBTA, Teamtailor, and Drupal expose their resources via JSON:API, providing a consistent specification for fetching, including related resources, filtering, sorting, an...
- **Semantic Search and Structured Data** — Schema.org and JSON-LD allow APIs and websites to publish machine-readable Linked Data that search engines, agents, and aggregators can consume without bespoke parsers.
- **API Discovery and Catalogs** — APIs.json and RFC 9264 api-catalog documents act as hypermedia entry points that let crawlers, tooling, and AI agents discover an organization's APIs, specifications, and polici...
- **Hypermedia-Driven Web Apps** — Approaches like htmx, hyperview, and Hypermedia Systems return HTML fragments and hypermedia controls directly to the client, simplifying applications by treating HTML itself as...

## Tags

Hypermedia, HATEOAS, HAL, JSON:API, Link Headers, Link Relations, Siren, Collection+JSON, Linked Data, JSON-LD, Hydra, ALPS

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/hypermedia/). Scores are computed from the provider's own public artifacts under a published rubric.