The Index

theindex.fyi is a maintained meta-index of indie web and small web index sites — a curated catalog of curated catalogs. It tracks ~40 indexes spanning six categories (curated directories, RSS / feed aggregators, search engines, random-discovery tools, constraint-based clubs, and IndieWeb infrastructure), and exposes the catalog through a public, read-only JSON:API.

The Index publishes 1 API contract indexed on the APIs.io network: Indexes API. Tagged areas include Indie Web, Small Web, Directories, Search, and RSS.

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

The Index’s developer surface includes documentation and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.5/100 emerging ▬ flat Agent 33/100 agent ready Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFree

1 published contract

Indie WebSmall WebDirectories Search RSSWebringsOpen Data JSON:API

Kin Score

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

Composite quality — 22.5/100 · emerging

Contract Quality 10.9 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 0.7 / 17

Operational Transparency 0.5 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 33/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 4 / 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 Government & Public Sector 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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 →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) 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 →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 4.3 — up to +19.1 composite points Ask about this →
Developer Ergonomics scores 9.5 — up to +18.1 composite points Ask about this →
Operational Transparency scores 4.8 — up to +12.4 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/the-index-fyi/apis.yml: open an issue on github.com/api-evangelist/the-index-fyi 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 3

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.

JSON:API

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

RSS

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

OpenAPI

measured — observed by APIs.io (published)

APIs 1

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

The Index Indexes API

Approved indie web and small web index sites.

Open Collections 2

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

theindex.fyi Indexes API

OPEN COLLECTION

theindex.fyi

OPEN COLLECTION

The Index API pricing

Not yet checked against The Index's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against The Index's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

The Index Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

The Index Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

The Index 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.

The Index API Rules

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

SPECTRAL

Security Posture 1

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

The Index Domain Security

TLSv1.3

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

The Index Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

AboutUs

AboutUs

Source (apis.yml)

aid: the-index-fyi
name: The Index
description: theindex.fyi is a maintained meta-index of indie web and small web index sites — a curated catalog of curated
  catalogs. It tracks ~40 indexes spanning six categories (curated directories, RSS / feed aggregators, search engines, random-discovery
  tools, constraint-based clubs, and IndieWeb infrastructure), and exposes the catalog through a public, read-only JSON:API.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
position: Producing
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/the-index-fyi.png
tags:
- Indie Web
- Small Web
- Directories
- Search
- RSS
- Webrings
- Open Data
- JSON:API
url: https://raw.githubusercontent.com/api-evangelist/the-index-fyi/refs/heads/main/apis.yml
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.23'
apis:
- aid: the-index-fyi:the-index-fyi-indexes-api
  name: The Index Indexes API
  description: Approved indie web and small web index sites.
  humanURL: https://theindex.fyi/api/docs
  baseURL: https://theindex.fyi/api
  tags:
  - Index
  tags_raw:
  - Indexes
  properties:
  - type: OpenAPI
    url: openapi/the-index-fyi-indexes-api-openapi.yml
  - type: Documentation
    url: https://theindex.fyi/api/docs
  - type: HumanURL
    url: https://theindex.fyi/
  - type: AboutUs
    url: https://theindex.fyi/about
common:
- type: AgenticAccess
  url: agentic-access/the-index-fyi-agentic-access.yml
- type: DomainSecurity
  url: security/the-index-fyi-domain-security.yml
- type: Website
  url: https://theindex.fyi/
- type: AboutUs
  url: https://theindex.fyi/about
- type: Documentation
  url: https://theindex.fyi/api/docs
- type: OpenAPI
  url: openapi/_original/the-index-fyi-openapi.yml
- type: Plans
  url: plans/the-index-fyi-plans-pricing.yml
- type: RateLimits
  url: rate-limits/the-index-fyi-rate-limits.yml
- type: FinOps
  url: finops/the-index-fyi-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

The Index API — frequently asked questions

Does The Index have an API?

Yes. APIs.io lists 1 API from The Index, including The Index Indexes API.

Is there an OpenAPI specification for the The Index API?

Yes. APIs.io indexes 1 OpenAPI specification for The Index, each linked for download from this page.

How much does the The Index API cost?

APIs.io lists 1 pricing plan for The Index, with each plan's price, limits and inclusions under Pricing on this page.

Is the The Index API ready for AI agents?

The Index has a Kin Score of 22.5 out of 100 (emerging) and an Agent Readiness score of 33.2 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

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MCP server

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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