Slack API

API

Web API, events and bot tools for building Slack apps

Price: Free tier, then paid
Access: Bot token (OAuth)

About

The Slack API lets apps post messages, react to workspace events and slash commands, and run bots inside Slack. It is for teams building alerts, internal tools and chat bots. An app must be installed to a workspace, and it only gets the scopes an admin approves.

What you can do with it

Post messages and alerts to Slack channels from your app
Build bots that answer mentions, messages and slash commands
Receive workspace events such as new messages and reactions

Get started

Create a Slack app and add the chat:write scope
Install the app to your workspace
Copy the bot token (xoxb-...)

Example

curl -X POST https://slack.com/api/chat.postMessage \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-type: application/json" \
  -d '{"channel":"C123ABC456","text":"Hello, world."}'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Java
MCP server: Remote
Works with: Slack