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
39.7/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
5 APIs
Change Data CaptureCDCPostgresStreamingOpen SourceData Pipeline

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 39.7/100 · thin
Contract Quality 15.3 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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
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.

Sequin Backfills API

Replay existing Postgres rows into a sink.

Sequin HTTP Endpoints API

Reusable HTTP endpoint destinations used by webhook sinks.

Sequin Postgres Databases API

Source Postgres database connections Sequin replicates from.

Sequin Sink Consumers API

Destinations that stream Postgres changes to external systems.

Sequin Stream Pull API

HTTP pull consumption for the Sequin Stream sink.

Open Collections 1

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

Sequin Management API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Sequin Io Plans Pricing

4 plans

PLANS

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.

Sequin Io Finops

FINOPS

Security Posture 2

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

Sequin Io Authentication

http · 1 scheme

SECURITY

Sequin Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Sequin Io Agentic Access

25 operations · 16 acting

25 operations · 16 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
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.19'
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
  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