Relay Compiler

Relay is Meta's open-source JavaScript framework and ahead-of-time GraphQL compiler for building data-driven React applications. The Relay Compiler scans JavaScript code for GraphQL fragments, aggregates and optimizes data requirements for entire apps, pre-computes queries at build time for efficient runtime performance, and generates TypeScript/Flow types for React components. It supports pagination, mutations, subscriptions, and deferred data streaming via GraphQL directives.

Relay Compiler is listed with 2 APIs on the APIs.io network. Tagged areas include Code Generation, GraphQL, React, Meta, and Open Source.

The Relay Compiler catalog on APIs.io includes 1 JSON-LD context.

Relay Compiler’s developer surface includes documentation, engineering blog, changelog, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.8/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent Heartbeat 28/100 slowing self hosted · MIT Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

2 APIs

Code Generation GraphQL React Meta Open Source TypeScript Build Tools

Kin Score

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

Composite quality — 22.8/100 · emerging

Contract Quality 2.0 / 19

Developer Ergonomics 2.9 / 15

Access Clarity 1.9 / 15

Operational Transparency 2.6 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 0.7 / 15

Open Source Surface 6.5 / 10

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/relay-compiler/"><img src="https://apis.io/badge/relay-compiler/card.svg" alt="Relay Compiler on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
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 →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author 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 →
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 →

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 10.7 — up to +22.3 composite points Ask about this →
Access Clarity scores 12.8 — up to +17.4 composite points Ask about this →
Developer Ergonomics scores 19.0 — up to +16.2 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/relay-compiler/apis.yml: open an issue on github.com/api-evangelist/relay-compiler 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.

GraphQL

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

APIs 2

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

Relay Compiler

The Relay Compiler is Meta's ahead-of-time GraphQL compiler that generates optimized runtime artifacts and type-safe code for Relay applications. It processes GraphQL fragments ...

Relay Runtime

The Relay Runtime provides the client-side execution environment for Relay applications. It includes the normalized in-memory store, network layer, and React hooks including use...

GraphQL 1

GraphQL schemas published by this provider.

Relay Compiler GraphQL API

The Relay Compiler is Meta's ahead-of-time GraphQL compiler that generates optimized runtime artifacts and type-safe code for Relay applications. It processes GraphQL fragments ...

GRAPHQL

Relay Compiler API pricing

Not yet checked against Relay Compiler'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 Relay Compiler's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Relay Compiler Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Relay Compiler Rate Limits

5 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Relay Compiler

3 quoted statements, read from Relay Compiler's own page on 2026-11-10.

TERMS

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Relay Compiler

2 quoted statements, read from Relay Compiler's own page on 2026-11-10.

LICENSE

FinOps 1

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

Relay Compiler Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Relay Compiler Context

0 classes · 20 properties

JSON-LD

Security Posture 1

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

Relay Compiler Domain Security

TLSv1.3

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

JSONLDContext

JSONLDContext

Vocabulary

Vocabulary

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

npm Package

npm Package

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

ChangeLog

ChangeLog

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

License

UsageTerms

DataLicense

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: relay-compiler
name: Relay Compiler
description: Relay is Meta's open-source JavaScript framework and ahead-of-time GraphQL compiler for building data-driven
  React applications. The Relay Compiler scans JavaScript code for GraphQL fragments, aggregates and optimizes data requirements
  for entire apps, pre-computes queries at build time for efficient runtime performance, and generates TypeScript/Flow types
  for React components. It supports pagination, mutations, subscriptions, and deferred data streaming via GraphQL directives.
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
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/relay-compiler.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Code Generation
- GraphQL
- React
- Meta
- Open Source
- TypeScript
- Build Tools
tags_raw:
- Code Generation
- GraphQL
- React
- Meta
- Open Source
- TypeScript
- Build Tools
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/relay-compiler/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-05-02'
specificationVersion: '0.23'
apis:
- aid: relay-compiler:relay-compiler
  name: Relay Compiler
  description: The Relay Compiler is Meta's ahead-of-time GraphQL compiler that generates optimized runtime artifacts and
    type-safe code for Relay applications. It processes GraphQL fragments in JavaScript/TypeScript source code, aggregates
    data requirements, optimizes queries, and generates TypeScript or Flow types. The compiler enforces GraphQL best practices
    including connection patterns, pagination fragments, and data masking.
  humanURL: https://relay.dev
  tags:
  - Compilers
  - GraphQL
  - Code Generation
  - Build Tools
  - TypeScript
  - Flow
  tags_raw:
  - Compiler
  - GraphQL
  - Code Generation
  - Build Tool
  - TypeScript
  - Flow
  properties:
  - type: Documentation
    url: https://relay.dev/docs/
  - type: GettingStarted
    url: https://relay.dev/docs/getting-started/
  - type: APIReference
    url: https://relay.dev/docs/api-reference/graphql-and-directives/
  - type: GitHubRepository
    url: https://github.com/facebook/relay
  - type: ReleaseNotes
    url: https://github.com/facebook/relay/releases
  - url: graphql/relay-compiler-graphql.md
    type: GraphQL
- aid: relay-compiler:relay-runtime
  name: Relay Runtime
  description: The Relay Runtime provides the client-side execution environment for Relay applications. It includes the normalized
    in-memory store, network layer, and React hooks including usePreloadedQuery, useFragment, usePaginationFragment, useRefetchableFragment,
    useMutation, and useSubscription for declarative data-fetching in React components.
  humanURL: https://relay.dev/docs/api-reference/
  tags:
  - Runtime
  - React Hooks
  - State Management
  - GraphQL Client
  - Data Fetching
  properties:
  - type: Documentation
    url: https://relay.dev/docs/api-reference/
  - type: GitHubRepository
    url: https://github.com/facebook/relay
common:
- type: Plans
  url: plans/relay-compiler-plans-pricing.yml
- type: RateLimits
  url: rate-limits/relay-compiler-rate-limits.yml
- type: FinOps
  url: finops/relay-compiler-finops.yml
- type: IssueTracker
  url: https://github.com/facebook/relay/issues
- type: CodeOfConduct
  url: https://github.com/facebook/relay/blob/main/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/facebook/relay/blob/main/.github/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/facebook/relay/blob/main/LICENSE
- type: DomainSecurity
  url: security/relay-compiler-domain-security.yml
- type: Website
  url: https://relay.dev
- type: Documentation
  url: https://relay.dev/docs/
- type: GitHubOrganization
  url: https://github.com/facebook/relay
- type: npm Package
  url: https://www.npmjs.com/package/relay-compiler
- type: Blog
  url: https://relay.dev/blog/
- type: ChangeLog
  url: https://github.com/facebook/relay/releases
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/relay-compiler/refs/heads/main/json-ld/relay-compiler-context.jsonld
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/relay-compiler/refs/heads/main/vocabulary/relay-compiler-vocabulary.yml
- type: UsageTerms
  url: terms/relay-compiler-terms-of-service.yml
- type: DataLicense
  url: data-license/relay-compiler-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Relay Compiler API — frequently asked questions

Does Relay Compiler have an API?

Yes. APIs.io lists 2 APIs from Relay Compiler, including Relay Compiler and Relay Runtime.

How much does the Relay Compiler API cost?

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

Is the Relay Compiler API ready for AI agents?

Relay Compiler has a Kin Score of 22.8 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/relay-compiler"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/relay-compiler/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/relay-compiler/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.