Slack Web API

slack.com

An HTTP RPC-style API for querying data from and making changes in a Slack workspace, such as posting messages and managing channels.

The Slack Web API API uses oauth2 authentication; has freemium pricing; offers a free tier (Slack offers a Free plan (€0, free forever) with API access; the Web API itself has no separate usage fee); rate limits: Per method/workspace/app per minute: Tier 1 ~1+/min, Tier 2 ~20+/min, Tier 3 ~50+/min, Tier 4 ~100+/min; posting messages ~1/sec per channel; HTTP 429 with Retry-After when exceeded. Verified 2026-07-12 with per-field source links.

Other Verified 2026-07-12 high confidence

Base URL

https://slack.com/api

docs.slack.dev ↗

Auth

oauth2

docs.slack.dev ↗

Free tier

Slack offers a Free plan (€0, free forever) with API access; the Web API itself has no separate usage fee

slack.com ↗

Pricing model

freemium

slack.com ↗

Pricing

Slack product plans: Free €0; Pro €8.25/user/mo (monthly); Business+ €18/user/mo (monthly); Enterprise+ contact sales

slack.com ↗

Rate limits

Per method/workspace/app per minute: Tier 1 ~1+/min, Tier 2 ~20+/min, Tier 3 ~50+/min, Tier 4 ~100+/min; posting messages ~1/sec per channel; HTTP 429 with Retry-After when exceeded

docs.slack.dev ↗

OpenAPI spec

https://github.com/slackapi/slack-api-specs

github.com ↗

MCP server

not documented null

no source