# Etcd

**Canonical:** https://apis.io/providers/etcd/  
**Website:** https://etcd.io  
**APIs profiled:** 10

etcd is a CNCF graduated distributed, reliable key-value store used as the backing store for all Kubernetes cluster data. It provides strong consistency guarantees using the Raft consensus algorithm, supporting watch operations, lease-based TTLs, and atomic compare-and-swap transactions. etcd is designed for high availability and stores critical configuration data for distributed systems.

## Kin Score — 39.5 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 39.5).

| Facet | Score |
|---|---|
| Discoverability | 72.2 |
| Contract Quality | 60.8 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 39.5 |
| Developer Ergonomics | 40.5 |
| Commercial Clarity | 13.2 |
| Access Clarity | 13.2 |

## Agent readiness — 35.9 (agent-ready)

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

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (10)

- **etcd gRPC API** — The etcd v3 API is a gRPC-based interface providing key-value operations (put, get, delete, range), watch streams for change notifications, lease management for TTL-based keys, ...
- **etcd Concurrency API** — The etcd concurrency API provides distributed primitives built on top of the core key-value store, including distributed mutexes (locks), leader election, and software transacti...
- **etcd Metrics API** — etcd exposes a Prometheus-compatible metrics endpoint that provides operational insights into the etcd cluster, including request rates, latency histograms, disk I/O statistics,...
- **etcd v2 HTTP API** — The original etcd v2 API exposed a RESTful HTTP interface for key-value operations using a hierarchical directory structure. This API has been deprecated in favor of the v3 gRPC...
- **Etcd Auth API** — Authentication and authorization management for users and roles
- **Etcd Cluster API** — Cluster membership management including member add, remove, and list
- **Etcd KV API** — Key-value store operations including put, get, delete, and range queries
- **Etcd Lease API** — Lease management for TTL-based key expiration
- **Etcd Maintenance API** — Maintenance operations including snapshots, defragmentation, and status
- **Etcd Watch API** — Watch operations for streaming key change notifications

## Agentic access (1)

- **Etcd Agentic Access** — 38 operations · 38 acting · 4 human-in-the-loop

## Security (2)

- **Etcd Authentication** — http · 1 scheme
- **Etcd Domain Security** — TLSv1.3 · HSTS

## Plans (1)

- **Etcd Plans Pricing**

## Tags

Cloud-Native, Consensus, Distributed Systems, Graduated, Key-Value Store, Kubernetes

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