Kurrent

Kurrent — formerly Event Store Ltd — builds KurrentDB, an event-native database purpose-built to store, process and deliver application state changes as an immutable, append-only log of events. Where a traditional CRUD database overwrites rows and discards the history that produced them, KurrentDB retains every state change as a first-class event, giving applications a complete audit trail, temporal queries and the ability to replay history to rebuild state or seed new read models. The product line spans KurrentDB (open-source and commercial, self-hosted), Kurrent Cloud (managed clusters on AWS, Azure and Google Cloud), Kurrent Enterprise, and Capacitor, a shared memory layer for agentic coding. Developers integrate over a primary gRPC protocol with official client SDKs for .NET, Java, Node.js, Python, Go and Rust, or over the native AtomPub-style HTTP API. Connectors move events in and out of Kafka, MongoDB, Elasticsearch, RabbitMQ, Pulsar, SQL and HTTP endpoints. KurrentDB is widely used for event sourcing, CQRS, event-driven microservices, change data capture and, increasingly, as durable memory for AI agents.

Kurrent publishes 8 APIs on the APIs.io network, including Admin API, Gossip API, Info API, and 5 more. Tagged areas include Company, Database, Event Sourcing, Event Streaming, and Event Driven Architecture.

The Kurrent catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Kurrent’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 40 more developer resources.

🌐 Visit website 📡 Source on GitHub

45.8/100 developing ▬ flat Agent 46/100 agent native saas Full breakdown ↓
scored 2026-08-30 · rubric v0.17.2

AccessSelf serve

1 APIs 1 MCP Servers

Company Database Event Sourcing Event StreamingEvent Driven ArchitectureCQRS Data Infrastructure Developer Tools Cloud Open-Source gRPC Agentic AI

Kin Score

Kin Score How this is scored →
scored 2026-08-30 · rubric v0.17.2

Composite quality — 45.8/100 · developing

Contract Quality 5.4 / 25

Developer Ergonomics 18.1 / 20

Access Clarity 7.6 / 20

Operational Transparency 6.5 / 13

Contract Governance 0.5 / 12

Discoverability 7.6 / 10

Agent readiness — 46/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 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/kurrent: 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 9

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Kurrent Scopes

14 scopes · authorizationCode/clientCredentials/deviceCode

14 scopes

SCOPES

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Sandbox

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

LLMsTxt

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

ErrorCatalog

Conformance

Lifecycle

DataModel

Webhooks

Scroll for all 8

Build 5

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

Packages

SDKs

CLI

Access & Security 5

Authentication, authorization, and security posture

Authentication

OAuthScopes

TrustCenter

TrustCenter

DomainSecurity

Learn 2

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Training

Training

Operate 7

Status, limits, changes, and where to get help

Support

HelpCenter

StatusPage

ChangeLog

Discord

Deprecation

ChangeLog

Scroll for all 7

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 2

Properties that don't map to a standard resource type

Protobuf

Protobuf

Overlay

Overlay

Source (apis.yml)

aid: kurrent
name: Kurrent
description: Kurrent — formerly Event Store Ltd — builds KurrentDB, an event-native database purpose-built to store, process
  and deliver application state changes as an immutable, append-only log of events. Where a traditional CRUD database overwrites
  rows and discards the history that produced them, KurrentDB retains every state change as a first-class event, giving applications
  a complete audit trail, temporal queries and the ability to replay history to rebuild state or seed new read models. The
  product line spans KurrentDB (open-source and commercial, self-hosted), Kurrent Cloud (managed clusters on AWS, Azure and
  Google Cloud), Kurrent Enterprise, and Capacitor, a shared memory layer for agentic coding. Developers integrate over a
  primary gRPC protocol with official client SDKs for .NET, Java, Node.js, Python, Go and Rust, or over the native AtomPub-style
  HTTP API. Connectors move events in and out of Kafka, MongoDB, Elasticsearch, RabbitMQ, Pulsar, SQL and HTTP endpoints.
  KurrentDB is widely used for event sourcing, CQRS, event-driven microservices, change data capture and, increasingly, as
  durable memory for AI agents.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.kurrent.io/favicon.ico
url: https://raw.githubusercontent.com/api-evangelist/kurrent/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- creandum
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Database
- Event Sourcing
- Event Streaming
- Event Driven Architecture
- CQRS
- Data Infrastructure
- Developer Tools
- Cloud
- Open-Source
- gRPC
- Agentic AI
tags_raw:
- Company
- Database
- Event Sourcing
- Event Streaming
- Event Driven Architecture
- CQRS
- Data Infrastructure
- Developer Tools
- Cloud
- Open Source
- gRPC
- Agentic AI
apis:
- aid: kurrent:kurrentdb-grpc-api
  name: KurrentDB gRPC API
  description: The primary protocol for KurrentDB. The published protocol buffer definitions cover the v2 streams service
    (multi-stream appends, reads), the schema registry service, the secondary index service, and the shared RPC error model.
    Every official client SDK — .NET, Java, Node.js, Python, Go and Rust — is generated against these contracts.
  humanURL: https://docs.kurrent.io/clients/
  baseURL: https://github.com/kurrent-io/KurrentDB/tree/master/proto
  tags:
  - gRPC
  - Protobuf
  - Streams
  - Schema Registry
  - Database
  properties:
  - type: Protobuf
    url: grpc/kurrent-streams.proto
  - type: Protobuf
    url: grpc/kurrent-rpc.proto
  - type: Documentation
    url: https://docs.kurrent.io/clients/
- aid: kurrent:kurrent-admin-api
  name: Kurrent Admin API
  description: Node administration operations
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Admin
  properties:
  - type: OpenAPI
    url: openapi/kurrent-admin-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-gossip-api
  name: Kurrent Gossip API
  description: Cluster gossip
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Gossip
  properties:
  - type: OpenAPI
    url: openapi/kurrent-gossip-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-info-api
  name: Kurrent Info API
  description: Node information and configuration
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Info
  properties:
  - type: OpenAPI
    url: openapi/kurrent-info-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-projections-api
  name: Kurrent Projections API
  description: Create, manage and query projections
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Projections
  properties:
  - type: OpenAPI
    url: openapi/kurrent-projections-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-statistics-api
  name: Kurrent Statistics API
  description: Node statistics
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Statistics
  properties:
  - type: OpenAPI
    url: openapi/kurrent-statistics-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-streams-api
  name: Kurrent Streams API
  description: Append to, read from and manage event streams
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Streams
  properties:
  - type: OpenAPI
    url: openapi/kurrent-streams-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-subscriptions-api
  name: Kurrent Subscriptions API
  description: Persistent (competing consumer) subscription management and consumption
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/kurrent-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
- aid: kurrent:kurrent-users-api
  name: Kurrent Users API
  description: User account management
  humanURL: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  baseURL: https://docs.kurrent.io/server/v26.1/http-api/api.html
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/kurrent-users-api-openapi.yml
  - type: Documentation
    url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html
  - type: APIReference
    url: https://docs.kurrent.io/server/v26.1/http-api/api.html
  - type: Authentication
    url: https://docs.kurrent.io/server/v26.1/http-api/security.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/kurrent/overview
- type: Website
  url: https://www.kurrent.io/
- type: DeveloperPortal
  url: https://docs.kurrent.io/dev-center/
- type: Documentation
  url: https://docs.kurrent.io/
- type: APIReference
  url: https://docs.kurrent.io/server/v26.1/http-api/api.html
- type: GettingStarted
  url: https://docs.kurrent.io/getting-started/quickstart/
- type: Support
  url: https://eventstore.freshdesk.com/support/login
- type: HelpCenter
  url: https://discuss.kurrent.io/
- type: Blog
  url: https://www.kurrent.io/blog
- type: BlogRSS
  url: https://www.kurrent.io/rss.xml
- type: GitHubOrganization
  url: https://github.com/kurrent-io
- type: Pricing
  url: https://www.kurrent.io/pricing
- type: SignUp
  url: https://identity.eventstore.com/login
- type: Login
  url: https://console.kurrent.cloud/
- type: TermsOfService
  url: https://www.kurrent.io/terms-of-use
- type: PrivacyPolicy
  url: https://www.kurrent.io/privacy-policy
- type: StatusPage
  url: https://status.eventstore.cloud/
- type: ChangeLog
  url: https://www.kurrent.io/releases
- type: Discord
  url: https://discord.gg/Phn9pmCw3t
- type: YouTube
  url: https://www.youtube.com/@Kurrent_io
- type: Training
  url: https://academy.kurrent.io
- type: Packages
  url: packages/kurrent-packages.yml
- type: SDKs
  url: packages/kurrent-packages.yml
- type: CLI
  url: cli/kurrent-cli.yml
- type: MCPServer
  url: mcp/kurrent-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/kurrent-llms.txt
- type: WellKnown
  url: well-known/kurrent-well-known.yml
- type: Authentication
  url: authentication/kurrent-authentication.yml
- type: OAuthScopes
  url: scopes/kurrent-scopes.yml
- type: Conventions
  url: conventions/kurrent-conventions.yml
- type: Idempotency
  url: conventions/kurrent-conventions.yml
- type: ErrorCatalog
  url: errors/kurrent-problem-types.yml
- type: ErrorCatalog
  url: errors/kurrent-error-codes.yml
- type: Sandbox
  url: sandbox/kurrent-sandbox.yml
- type: Conformance
  url: conformance/kurrent-conformance.yml
- type: Lifecycle
  url: lifecycle/kurrent-lifecycle.yml
- type: Deprecation
  url: lifecycle/kurrent-lifecycle.yml
- type: ChangeLog
  url: changelog/kurrent-changelog.yml
- type: DataModel
  url: data-model/kurrent-data-model.yml
- type: Webhooks
  url: asyncapi/kurrent-connectors-webhooks.yml
- type: TrustCenter
  url: https://trust.kurrent.io/
- type: TrustCenter
  url: security/kurrent-trust-center.yml
- type: DomainSecurity
  url: security/kurrent-domain-security.yml
- type: Protobuf
  url: grpc/kurrent-streams.proto
- type: Overlay
  url: overlays/kurrent-kurrentdb-http-api-overlay.yaml
- type: OpenAPI
  url: openapi/_original/kurrent-kurrentdb-http-api-openapi.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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