Estuary

Estuary builds Estuary Flow, a real-time data movement platform for streaming ETL and change data capture (CDC). Flow captures data from databases, warehouses, and SaaS systems into durable collections and materializes those collections back out to destinations. The Flow control plane exposes a Supabase/PostgREST-based REST API (Bearer refresh/access tokens) covering captures, materializations, collections, catalog drafts and publications, connectors, and tenants/billing, while the data plane is driven declaratively via the flowctl CLI and a Gitops model.

Estuary publishes 8 API contracts indexed on the APIs.io network, including Auth API, Captures API, Collections API, and 5 more. Tagged areas include Data Integration, Streaming ETL, Change Data Capture, Real-Time Data, and Data Pipeline.

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

Estuary’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.6/100 thin ▬ flat Agent 22/100 agent aware Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Data IntegrationStreaming ETLChange Data Capture Real-Time Data Data Pipeline

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Subscription Billing & Revenue Management

BC-4250

Tenants

GET /catalog_stats POST /rpc/billing_report_202308

Kin Score

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

Composite quality — 27.6/100 · thin

Contract Quality 8.3 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 1.0 / 15

Operational Transparency 1.2 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 1.1 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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 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 0 / 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 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 →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Contract Quality scores 44.5 — up to +13.9 composite points Ask about this →
Developer Ergonomics scores 32.1 — up to +13.6 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/estuary/apis.yml: open an issue on github.com/api-evangelist/estuary 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Data Integration (ELT connectors and data governance)	builds-on	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 8

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

Estuary Auth API

The Auth API from Estuary — 5 operation(s) for auth.

Estuary Captures API

The Captures API from Estuary — 2 operation(s) for captures.

Estuary Collections API

The Collections API from Estuary — 3 operation(s) for collections.

Estuary Connectors API

The Connectors API from Estuary — 3 operation(s) for connectors.

Estuary Drafts API

The Drafts API from Estuary — 3 operation(s) for drafts.

Estuary Materializations API

The Materializations API from Estuary — 2 operation(s) for materializations.

Estuary Publications API

The Publications API from Estuary — 1 operation(s) for publications.

Estuary Tenants API

The Tenants API from Estuary — 3 operation(s) for tenants.

Scroll for all 8

Open Collections 9

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

Estuary Flow Control Plane Auth API

OPEN COLLECTION

Estuary Flow Control Plane Auth Captures API

OPEN COLLECTION

Estuary Flow Control Plane Auth Collections API

OPEN COLLECTION

Estuary Flow Control Plane Auth Connectors API

OPEN COLLECTION

Estuary Flow Control Plane Auth Drafts API

OPEN COLLECTION

Estuary Flow Control Plane Auth Materializations API

OPEN COLLECTION

Estuary Flow Control Plane Auth Publications API

OPEN COLLECTION

Estuary Flow Control Plane Auth Tenants API

OPEN COLLECTION

Estuary Flow Control Plane API

OPEN COLLECTION

Scroll for all 9

Estuary API pricing

Not yet checked against Estuary's own pricing page. Compiled by API Evangelist on 2026-07-01 from estuary.dev/pricing/; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free free	—
Cloud usage	—
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Control-Plane API Requests: see provider documentation requests
Access Token Lifetime: short-lived (expires; re-issue via generate_access_token) seconds
Tenant Tasks Quota: per-tenant quota (tasks_quota) tasks

Compiled by API Evangelist, not yet checked against Estuary's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Estuary Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Estuary Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Estuary 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.

Estuary API Rules

60 rules · 58 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Estuary Authentication

http · 1 scheme

SECURITY

Estuary Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Estuary Agentic Access

22 operations · 9 acting · 1 human-in-the-loop

22 operations · 9 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

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 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: estuary
url: https://raw.githubusercontent.com/api-evangelist/estuary/refs/heads/main/apis.yml
name: Estuary
kind: company
description: Estuary builds Estuary Flow, a real-time data movement platform for streaming ETL and change data capture (CDC).
  Flow captures data from databases, warehouses, and SaaS systems into durable collections and materializes those collections
  back out to destinations. The Flow control plane exposes a Supabase/PostgREST-based REST API (Bearer refresh/access tokens)
  covering captures, materializations, collections, catalog drafts and publications, connectors, and tenants/billing, while
  the data plane is driven declaratively via the flowctl CLI and a Gitops model.
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: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/estuary.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
tags:
- Data Integration
- Streaming ETL
- Change Data Capture
- Real-Time Data
- Data Pipeline
tags_raw:
- Data Integration
- Streaming ETL
- Change Data Capture
- Real-Time Data
- Data Pipelines
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.23'
apis:
- aid: estuary:estuary-auth-api
  name: Estuary Auth API
  description: The Auth API from Estuary — 5 operation(s) for auth.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/estuary-auth-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-captures-api
  name: Estuary Captures API
  description: The Captures API from Estuary — 2 operation(s) for captures.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Capture
  tags_raw:
  - Captures
  properties:
  - type: OpenAPI
    url: openapi/estuary-captures-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-collections-api
  name: Estuary Collections API
  description: The Collections API from Estuary — 3 operation(s) for collections.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Collection
  tags_raw:
  - Collections
  properties:
  - type: OpenAPI
    url: openapi/estuary-collections-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-connectors-api
  name: Estuary Connectors API
  description: The Connectors API from Estuary — 3 operation(s) for connectors.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Connectors
  properties:
  - type: OpenAPI
    url: openapi/estuary-connectors-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-drafts-api
  name: Estuary Drafts API
  description: The Drafts API from Estuary — 3 operation(s) for drafts.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Drafts
  properties:
  - type: OpenAPI
    url: openapi/estuary-drafts-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-materializations-api
  name: Estuary Materializations API
  description: The Materializations API from Estuary — 2 operation(s) for materializations.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Materializations
  properties:
  - type: OpenAPI
    url: openapi/estuary-materializations-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-publications-api
  name: Estuary Publications API
  description: The Publications API from Estuary — 1 operation(s) for publications.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Publications
  properties:
  - type: OpenAPI
    url: openapi/estuary-publications-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
- aid: estuary:estuary-tenants-api
  name: Estuary Tenants API
  description: The Tenants API from Estuary — 3 operation(s) for tenants.
  humanURL: https://docs.estuary.dev/concepts/captures/
  baseURL: https://api.estuary.dev
  tags:
  - Tenants
  properties:
  - type: OpenAPI
    url: openapi/estuary-tenants-api-openapi.yml
  - type: Documentation
    url: https://docs.estuary.dev/concepts/captures/
  - type: APIReference
    url: https://docs.estuary.dev/concepts/
  - type: PostmanCollection
    url: collections/estuary.postman_collection.json
  - type: OpenCollection
    url: collections/estuary.opencollection.json
  - type: Documentation
    url: https://docs.estuary.dev/concepts/materialization/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/collections/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/catalogs/
  - type: Documentation
    url: https://docs.estuary.dev/concepts/connectors/
  - type: Documentation
    url: https://docs.estuary.dev/getting-started/pricing/
  - type: Documentation
    url: https://docs.estuary.dev/reference/authentication/
common:
- type: CapabilityMap
  url: capabilities/estuary-capability-edges.yml
  name: Estuary Business Capability Map
- type: AgenticAccess
  url: agentic-access/estuary-agentic-access.yml
- type: DomainSecurity
  url: security/estuary-domain-security.yml
- type: Authentication
  url: authentication/estuary-authentication.yml
- type: GitHubOrganization
  url: https://github.com/estuary
- type: LinkedIn
  url: https://www.linkedin.com/company/estuary-tech
- type: Website
  url: https://estuary.dev/
- type: Documentation
  url: https://docs.estuary.dev
- type: Plans
  url: plans/estuary-plans-pricing.yml
- type: RateLimits
  url: rate-limits/estuary-rate-limits.yml
- type: FinOps
  url: finops/estuary-finops.yml
- url: https://estuary.dev/blog/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Estuary API — frequently asked questions

Does Estuary have an API?

Yes. APIs.io lists 8 APIs from Estuary, including Estuary Auth API, Estuary Captures API and Estuary Collections API, and 5 more.

Is there an OpenAPI specification for the Estuary API?

Yes. APIs.io indexes 8 OpenAPI specifications for Estuary, each linked for download from this page.

How do I authenticate with the Estuary API?

Estuary uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Estuary Authentication.

How much does the Estuary API cost?

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

Is the Estuary API ready for AI agents?

Estuary has a Kin Score of 27.6 out of 100 (thin) and an Agent Readiness score of 21.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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