Sequin

Sequin is an open-source Postgres change data capture (CDC) engine that streams Postgres rows and changes to streams, queues, and search indexes - Kafka, SQS, SNS, Kinesis, Redis, NATS, RabbitMQ, Elasticsearch, Typesense, GCP Pub/Sub, Azure Event Hubs, and HTTP/webhook endpoints - with exactly-once processing, backfills, and low-latency delivery. Sequin is self-hostable and also available as Sequin Cloud. Resources are configured declaratively via a sequin.yaml file or programmatically through the Management API; consumers can pull changes over HTTP via the Sequin Stream sink.

Sequin publishes 5 APIs on the APIs.io network, including Backfills API, HTTP Endpoints API, Postgres Databases API, and 2 more. Tagged areas include Change Data Capture, CDC, Postgres, Streaming, and Open-Source.

Sequin’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.8/100 thin ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumSelf serve⚡ Free to try

5 APIs

Change Data Capture CDC Postgres Streaming Open-Source Data Pipeline

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 38.8/100 · thin

Contract Quality 14.3 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 7.9 / 20

Operational Transparency 4.4 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 20/100 · 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 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/sequin-io: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

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

Rate Limits 1

Documented rate limits and quota policies.

Sequin Io Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

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

Source (apis.yml)

aid: sequin-io
url: https://raw.githubusercontent.com/api-evangelist/sequin-io/refs/heads/main/apis.yml
name: Sequin
kind: company
description: Sequin is an open-source Postgres change data capture (CDC) engine that streams Postgres rows and changes to
  streams, queues, and search indexes - Kafka, SQS, SNS, Kinesis, Redis, NATS, RabbitMQ, Elasticsearch, Typesense, GCP Pub/Sub,
  Azure Event Hubs, and HTTP/webhook endpoints - with exactly-once processing, backfills, and low-latency delivery. Sequin
  is self-hostable and also available as Sequin Cloud. Resources are configured declaratively via a sequin.yaml file or programmatically
  through the Management API; consumers can pull changes over HTTP via the Sequin Stream sink.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sequin-io.png
tags:
- Change Data Capture
- CDC
- Postgres
- Streaming
- Open-Source
- Data Pipeline
tags_raw:
- Change Data Capture
- CDC
- Postgres
- Streaming
- Open Source
- Data Pipeline
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.23'
apis:
- aid: sequin-io:sequin-io-backfills-api
  name: Sequin Backfills API
  description: Replay existing Postgres rows into a sink.
  humanURL: https://sequinstream.com/docs/management-api/sink-consumers/list
  baseURL: https://api.sequinstream.com/api
  tags:
  - backfills
  tags_raw:
  - Backfills
  properties:
  - type: OpenAPI
    url: openapi/sequin-io-backfills-api-openapi.yml
  - type: Documentation
    url: https://sequinstream.com/docs/management-api/introduction
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/sink-consumers/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/postgres_databases/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/http-endpoints/get
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/backfills/create
  - type: Documentation
    url: https://sequinstream.com/docs/reference/sinks/sequin-stream
- aid: sequin-io:sequin-io-http-endpoints-api
  name: Sequin HTTP Endpoints API
  description: Reusable HTTP endpoint destinations used by webhook sinks.
  humanURL: https://sequinstream.com/docs/management-api/sink-consumers/list
  baseURL: https://api.sequinstream.com/api
  tags:
  - HTTP Endpoints
  properties:
  - type: OpenAPI
    url: openapi/sequin-io-http-endpoints-api-openapi.yml
  - type: Documentation
    url: https://sequinstream.com/docs/management-api/introduction
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/sink-consumers/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/postgres_databases/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/http-endpoints/get
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/backfills/create
  - type: Documentation
    url: https://sequinstream.com/docs/reference/sinks/sequin-stream
- aid: sequin-io:sequin-io-postgres-databases-api
  name: Sequin Postgres Databases API
  description: Source Postgres database connections Sequin replicates from.
  humanURL: https://sequinstream.com/docs/management-api/sink-consumers/list
  baseURL: https://api.sequinstream.com/api
  tags:
  - Postgres Databases
  properties:
  - type: OpenAPI
    url: openapi/sequin-io-postgres-databases-api-openapi.yml
  - type: Documentation
    url: https://sequinstream.com/docs/management-api/introduction
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/sink-consumers/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/postgres_databases/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/http-endpoints/get
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/backfills/create
  - type: Documentation
    url: https://sequinstream.com/docs/reference/sinks/sequin-stream
- aid: sequin-io:sequin-io-sink-consumers-api
  name: Sequin Sink Consumers API
  description: Destinations that stream Postgres changes to external systems.
  humanURL: https://sequinstream.com/docs/management-api/sink-consumers/list
  baseURL: https://api.sequinstream.com/api
  tags:
  - Sink Consumers
  properties:
  - type: OpenAPI
    url: openapi/sequin-io-sink-consumers-api-openapi.yml
  - type: Documentation
    url: https://sequinstream.com/docs/management-api/introduction
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/sink-consumers/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/postgres_databases/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/http-endpoints/get
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/backfills/create
  - type: Documentation
    url: https://sequinstream.com/docs/reference/sinks/sequin-stream
- aid: sequin-io:sequin-io-stream-pull-api
  name: Sequin Stream Pull API
  description: HTTP pull consumption for the Sequin Stream sink.
  humanURL: https://sequinstream.com/docs/management-api/sink-consumers/list
  baseURL: https://api.sequinstream.com/api
  tags:
  - Stream Pull
  properties:
  - type: OpenAPI
    url: openapi/sequin-io-stream-pull-api-openapi.yml
  - type: Documentation
    url: https://sequinstream.com/docs/management-api/introduction
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/sink-consumers/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/postgres_databases/list
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/http-endpoints/get
  - type: APIReference
    url: https://sequinstream.com/docs/management-api/backfills/create
  - type: Documentation
    url: https://sequinstream.com/docs/reference/sinks/sequin-stream
common:
- type: AgenticAccess
  url: agentic-access/sequin-io-agentic-access.yml
- type: DomainSecurity
  url: security/sequin-io-domain-security.yml
- type: Authentication
  url: authentication/sequin-io-authentication.yml
- type: GitHubOrganization
  url: https://github.com/sequinstream
- type: LinkedIn
  url: https://www.linkedin.com/company/sequin-io
- type: Website
  url: https://sequinstream.com
- type: Documentation
  url: https://sequinstream.com/docs
- type: Plans
  url: plans/sequin-io-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sequin-io-rate-limits.yml
- type: FinOps
  url: finops/sequin-io-finops.yml
- url: https://blog.sequinstream.com/feed
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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