# InstantDB

**Canonical:** https://apis.io/providers/instantdb/  
**Website:** https://www.instantdb.com  
**APIs profiled:** 6

InstantDB (Instant) is a realtime client-side database and Firebase alternative that gives apps a sync engine with multiplayer, offline mode, and optimistic updates by default. It exposes an HTTP Admin API (api.instantdb.com) for server-side InstaQL queries and InstaML transactions, plus auth, storage, presence, and a realtime WebSocket sync layer.

## Kin Score — 42.4 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 42.4).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 65.2 |
| Governance | 13.6 |
| Contract Governance | 13.6 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

## Agent readiness — 33.3 (agent-aware)

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

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

## APIs (6)

- **InstantDB Realtime Sync API** — 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 a...
- **InstantDB Auth API** — Server-side authentication, tokens, and users.
- **InstantDB Presence API** — Room presence lookups.
- **InstantDB Query API** — InstaQL read queries.
- **InstantDB Storage API** — File upload, listing, and deletion.
- **InstantDB Transactions API** — InstaML transaction writes.

## Agentic access (1)

- **Instantdb Agentic Access** — 14 operations · 12 acting

## Security (2)

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

## Plans (1)

- **Instantdb Plans Pricing**

## Tags

Database, Real-Time, Sync, Backend, Local-First

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