# PartyKit

**Canonical:** https://apis.io/providers/partykit/  
**Website:** https://www.partykit.io  
**APIs profiled:** 4

PartyKit is a real-time backend framework, now part of Cloudflare, that wraps Cloudflare Durable Objects with an opinionated developer experience for building multiplayer applications. It exposes a Party.Server library API for backend logic, a PartySocket client API for WebSockets, a Y-PartyKit Yjs integration, an HTTP/WebSocket interface at *.partykit.dev URLs, a CLI for local dev and deployment, and integrations with React, Next.js, and Remix.

## Kin Score — 40.1 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 40.1).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 46.7 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 31.0 |
| Commercial Clarity | 50.0 |
| Access Clarity | 50.0 |

## Agent readiness — 21.2 (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 | documented |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (4)

- **PartyKit Party.Server (Server API)** — Library API for defining server-side logic for a "party" - a backend object backed by a Cloudflare Durable Object. Provides lifecycle hooks for connections, messages, requests, ...
- **PartyKit PartySocket (Client API)** — Browser and runtime client library for connecting to a PartyKit server over WebSockets. Wraps the standard WebSocket API with reconnection, buffering, and resilience. Runs in We...
- **Y-PartyKit (Yjs Integration)** — Yjs provider for PartyKit that turns a party into a Yjs collaboration backend, enabling shared text, rich text, and structured CRDT documents across many clients.
- **PartyKit Deployed Party (HTTP / WebSocket)** — Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each party is reachable at /parties/{party}/{room} and accepts WebSocket upgrad...

## Security (1)

- **Partykit Domain Security** — TLSv1.3 · HSTS

## Plans (1)

- **Partykit Plans Pricing**

## Tags

Real-Time, Multiplayer, WebSockets, Cloudflare, Durable Objects, Edge, CRDT, Yjs, Serverless

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