# Mercurius

**Canonical:** https://apis.io/providers/mercurius/  
**Website:** https://mercurius.dev/  
**APIs profiled:** 1

High-performance GraphQL server for Fastify with Just-In-Time compilation via graphql-jit, automatic query caching, N+1 prevention via dataloader integration, federation support, subscription via WebSocket, batched query support, and GraphQL Playground integration.

## Kin Score — 19.6 / 100 (emerging)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 19.6).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 37.8 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 9.5 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 18.4 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| 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

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

## APIs (1)

- **Mercurius API** — GraphQL adapter for Fastify enabling high-performance GraphQL servers and gateways with JIT compilation, query caching, subscriptions, and federation.

## Security (1)

- **Mercurius Domain Security** — TLSv1.3

## Tags

GraphQL, Fastify, Node.js, Federation, WebSocket, Open-Source

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