# InstantDB Realtime Sync API

**Canonical:** https://apis.io/apis/instantdb/instantdb-realtime-sync-api/  
**Provider:** InstantDB — https://apis.io/providers/instantdb/  
**Base URL:** wss://api.instantdb.com/runtime/session  
**Documentation:** https://www.instantdb.com/essays/architecture

InstantDB Realtime Sync API is one of 6 APIs that [InstantDB](https://apis.io/providers/instantdb/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include Real-Time, WebSocket, Sync, and Presence. The published artifact set on APIs.io includes API documentation, an API reference, and an AsyncAPI specification.

The realtime sync transport - a persistent WebSocket at wss://api.instantdb.com/runtime/session over which the client Reactor sends init, add-query, transact, and presence ops and the server streams query novelty (refresh-ok), presence, and broadcasts back to subscribers.

## Machine-readable artifacts (4)

- **Documentation** — https://www.instantdb.com/essays/architecture
- **APIReference** — https://www.instantdb.com/docs/presence-and-topics
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/instantdb/refs/heads/main/asyncapi/instantdb-asyncapi.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/instantdb/refs/heads/main/apis.yml

## Other InstantDB APIs (5)

- [InstantDB Auth API](https://apis.io/apis/instantdb/instantdb-auth-api/)
- [InstantDB Presence API](https://apis.io/apis/instantdb/instantdb-presence-api/)
- [InstantDB Query API](https://apis.io/apis/instantdb/instantdb-query-api/)
- [InstantDB Storage API](https://apis.io/apis/instantdb/instantdb-storage-api/)
- [InstantDB Transactions API](https://apis.io/apis/instantdb/instantdb-transactions-api/)

## Tags

Real-Time, WebSocket, Sync, Presence

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/instantdb/instantdb-realtime-sync-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/instantdb/.