Slack · Rate Limits

Slack Rate Limits

Slack Web API uses per-method tiered rate limits. App-scoped, with overall limit varying by method tier.

Slack Rate Limits is the machine-readable rate-limit profile for Slack on the APIs.io network, in the API Commons Rate Limits shape.

It captures 6 rate-limit definitions, measuring requests_per_minute, messages_per_second, and events_per_second.

Limit state is signalled in the retryAfter response header, and an exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes response codes documented for throttled.

Tagged areas include Rate Limiting and Messaging.

6 Limits Exhausted: HTTP 429 retryAfter
Method: generated, dated 2026-05-04.
Written by API Evangelist on 2026-05-04 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
Rate LimitingMessaging

Limits

Tier 1 methods (e.g., admin.*) app/workspace
requests_per_minute · minute
1
Tier 2 methods (e.g., conversations.history) app/workspace
requests_per_minute · minute
20
Tier 3 methods (e.g., conversations.list) app/workspace
requests_per_minute · minute
50
Tier 4 methods (most common) app/workspace
requests_per_minute · minute
100
chat.postMessage (special) app/workspace/channel
messages_per_second · second
1
1 message per second per channel; short bursts of up to 17/min allowed.
Events API delivery app
events_per_second · hour
30000
30k events per hour per workspace per app; beyond, events are dropped.

Sources

Work with this as data

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

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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/slack-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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