Slack · Rate Limits
Slack Rate Limits
Slack Web API uses per-method tiered rate limits. App-scoped, with overall limit varying by method tier.
6 Limits
Throttle: 429
Rate LimitingMessaging
Limits
Tier 1 methods (e.g., admin.*) app/workspace
1
Tier 2 methods (e.g., conversations.history) app/workspace
20
Tier 3 methods (e.g., conversations.list) app/workspace
50
Tier 4 methods (most common) app/workspace
100
chat.postMessage (special) app/workspace/channel
1
1 message per second per channel; short bursts of up to 17/min allowed.
Events API delivery app
30000
30k events per hour per workspace per app; beyond, events are dropped.