# Event Sourcing

**Canonical:** https://apis.io/providers/event-sourcing/  
**Website:** https://martinfowler.com/eaaDev/EventSourcing.html  
**APIs profiled:** 0

Event sourcing is an architectural pattern where state changes are stored as a sequence of immutable events rather than just the current state. Instead of storing only the current state of data, event sourcing stores all changes as a log of events, enabling complete audit trails, temporal queries, and event-driven projections.

## Kin Score — 4.8 / 100 (minimal)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 4.8).

| Facet | Score |
|---|---|
| Discoverability | 48.1 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Event Sourcing Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Architecture, CQRS, Distributed Systems, Event Sourcing

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/event-sourcing/). Scores are computed from the provider's own public artifacts under a published rubric.