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POST /api/v1/{organisation}/widgets/{widget}/chat

Auth: widget domain, widget secret, or organisation API key with chat
Widget type: chatbot
Billing: uses one answer from your plan. When you have no answers left, the API returns 402 with free search hits in data (same shape as the search endpoint). No chat model is called. The official embed renders those results in the bubble.

#Body

Field Type Required Description
query string yes Visitor message, max 2048 characters
conversation_id string no Continue an existing conversation
session_id string no Analytics session
browser_language string no Language hint from the visitor's browser
context object no Up to 10 string keys with simple values (for example page URL or title)
user object no { "id": "…", "hash": "…" } signed visitor identity
stream bool no Set true for a streamed response instead of one JSON payload

#JSON response (stream false or omitted)

{
  "data": {
    "text": "…answer in markdown…",
    "conversation_id": "…",
    "answer_id": "…",
    "sources": [
      {
        "id": "0194b…",
        "external_id": "wp-42",
        "name": "Hello world",
        "url": "https://example.com/hello-world",
        "snippet": "…",
        "score": 0.91,
        "meta": null
      }
    ]
  },
  "session_id": "…"
}

#Streaming ("stream": true)

The response is a stream of server-sent events (text/event-stream):

Event Data When
status { "step": "searching", "query": "…" } Looking up sources
token { "text": "…" } Next piece of the answer
done { "conversation_id", "session_id", "answer_id", "sources": […] } Finished
error { "message": "…" } Something failed mid-stream

#Identity and conversation ownership

  • With a valid user.id and user.hash, the conversation belongs to that verified visitor.
  • Continuing a verified conversation without the same proof returns 403.
  • A bad hash returns 422.

See Conversations for listing history, reading transcripts, keeping conversations, and deletion.