Synapse · Rate Limits

Synapse Rate Limits

Synapse ships with documented per-second / burst-count rate limits configured under the `ratelimiting` section of homeserver.yaml. Defaults are operator-tunable. Limits are enforced per-user / per-IP / per-room as appropriate and are not bound to a commercial plan because Synapse is self-hosted open-source software.

Synapse Rate Limits is the machine-readable rate-limit profile for Synapse on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 11 rate-limit definitions, measuring requests_per_second.

The profile also includes 3 backoff/retry policies defined and response codes documented for throttled.

Tagged areas include Matrix, Messaging, Open Source, and Rate Limiting.

11 Limits Throttle: 429
MatrixMessagingOpen SourceRate Limiting

Limits

Client Messaging (rc_message) user
requests_per_second · second
0.2
Burst count 10. Applies to client message-send events.
Login by Address (rc_login.address) IP
requests_per_second · second
0.003
Burst count 5.
Login by Account (rc_login.account) account
requests_per_second · second
0.003
Burst count 5.
Failed Login Attempts (rc_login.failed_attempts) account
requests_per_second · second
0.17
Burst count 3.
Registration (rc_registration) IP
requests_per_second · second
0.17
Burst count 3.
Invites Per Room (rc_invites.per_room) room
requests_per_second · second
0.3
Burst count 10.
Invites Per User (rc_invites.per_user) user
requests_per_second · second
0.003
Burst count 5.
Invites Per Issuer (rc_invites.per_issuer) user
requests_per_second · second
0.3
Burst count 10.
Local Joins (rc_joins.local) user
requests_per_second · second
0.1
Burst count 10.
Remote Joins (rc_joins.remote) user
requests_per_second · second
0.01
Burst count 10.
Federation Read-Receipts (federation_rr_transactions_per_room_per_second) room
requests_per_second · second
50
Federation read-receipt transactions per room.

Policies

Operator-Tunable Defaults
All rate-limit values above are defaults from homeserver.yaml; operators may raise or lower them per deployment. Effective limits are therefore deployment-specific.
Per-Scope Enforcement
Limits are enforced per-user, per-IP, or per-room depending on the bucket; clients must distinguish 429s caused by user-bucket vs IP-bucket throttling.
Federation Backpressure
Federation limits (rc_joins.remote, federation_rr_transactions_per_room_per_second) protect remote homeservers; clients should expect backoff when joining large remote rooms.

Sources

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/synapse-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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