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AstrBot HTTP API

Starting from v4.18.0, AstrBot provides API Key based HTTP APIs for programmatic access.

Quick Start

1. Create an API key in WebUI - Settings.
2. Include the API key in request headers:

Authorization: Bearer abk_xxx

Also supported:

X-API-Key: abk_xxx

3. For chat endpoints, username is required:

• POST /api/v1/chat: request body must include username
• GET /api/v1/chat/sessions: query params must include username

Scope Permissions

When creating an API Key, you can configure scopes. Each scope controls the range of accessible endpoints:

Scope	Purpose	Accessible Endpoints
chat	Access chat capabilities and query sessions	POST /api/v1/chat, GET /api/v1/chat/sessions
config	Retrieve available config file list	GET /api/v1/configs
file	Upload attachment files and get attachment_id	POST /api/v1/file
im	Send proactive IM messages, query bot/platform list	POST /api/v1/im/message, GET /api/v1/im/bots

If the API Key does not include the required scope for the target endpoint, the request will return 403 Insufficient API key scope.

Common Endpoints

Chat

Interact with AstrBot's built-in Agent. Supports plugin calls, tool calls, and other capabilities — consistent with IM-side chat.

• POST /api/v1/chat: send chat message (SSE stream, server generates UUID when session_id is omitted)
• GET /api/v1/chat/sessions: list sessions for a specific username with pagination
• GET /api/v1/configs: list available config files

File Upload

• POST /api/v1/file: upload attachment

Proactive IM Messages

• POST /api/v1/im/message: send a proactive message via UMO
• GET /api/v1/im/bots: list bot/platform IDs

message Field Format (Important)

The message field in POST /api/v1/chat and POST /api/v1/im/message supports two formats:

1. String: plain text message
2. Array: message segments (message chain)

1. Plain Text Format

{
  "message": "Hello"
}

2. Message Segment Array Format

{
  "message": [
    { "type": "plain", "text": "Please see this file" },
    { "type": "file", "attachment_id": "9a2f8c72-e7af-4c0e-b352-111111111111" }
  ]
}

Supported type values:

type	Required Fields	Optional Fields	Description
plain	text	-	Text segment
reply	message_id	selected_text	Quote-reply a message
image	attachment_id	-	Image attachment segment
record	attachment_id	-	Audio attachment segment
file	attachment_id	-	Generic file segment
video	attachment_id	-	Video attachment segment

• The reply segment is currently only supported for /api/v1/chat, not for POST /api/v1/im/message.

Notes:

• attachment_id comes from the upload result of POST /api/v1/file.
• reply cannot be the only segment; at least one content segment (e.g. plain/image/file/...) is required.
• A request with only reply or empty content will return an error.

message Usage in Chat API

POST /api/v1/chat additionally requires username, with optional session_id (a UUID is auto-generated if omitted).

{
  "username": "alice",
  "session_id": "my_session_001",
  "message": [
    { "type": "plain", "text": "Please summarize this PDF" },
    { "type": "file", "attachment_id": "9a2f8c72-e7af-4c0e-b352-111111111111" }
  ],
  "enable_streaming": true
}

message Usage in IM Message API

POST /api/v1/im/message requires umo + message.

{
  "umo": "webchat:FriendMessage:openapi_probe",
  "message": [
    { "type": "plain", "text": "This is a proactive message" },
    { "type": "image", "attachment_id": "9a2f8c72-e7af-4c0e-b352-222222222222" }
  ]
}

Example

curl -N 'http://localhost:6185/api/v1/chat' \
  -H 'Authorization: Bearer abk_xxx' \
  -H 'Content-Type: application/json' \
  -d '{"message":"Hello","username":"alice"}'

Full API Reference

Use the interactive docs:

• https://docs.astrbot.app/scalar.html