Use the Chat API to integrate PolyAI agents into non-voice channels. It provides a simple set of REST endpoints for starting conversations, sending and receiving messages, and handling handoffs–ideal for webchat widgets, web SDKs, and SMS platforms. The Chat API powers webchat integrations including in-browser widgets, web SDK implementations, and SMS.Documentation Index
Fetch the complete documentation index at: https://docs.poly.ai/llms.txt
Use this file to discover all available pages before exploring further.
Chatting with the API
-
Start a conversation
Call
POST /{version}/{account_id}/{project_id}/chat/create. The response includes aconversation_idand the agent’s initialresponse. You can optionally passintegration_attributesto provide custom context to the agent, andvariant_idto target a specific variant. -
Send and receive messages
Call
POST /{version}/{account_id}/{project_id}/chat/respondwith theconversation_id.messageis optional. The response includes the agent’sresponse, anend_conversationflag, and may include ahandoffobject. -
Close a conversation
Call
PUT /{version}/{account_id}/{project_id}/chat/closewith theconversation_idin the body. The response returns{ "success": true }on success.
Endpoints
Base URLs
Endpoint format:
/{version}/{account_id}/{project_id}/chat/{operation}
version: API version (for examplev1)account_id: Your PolyAI account ID (for examplepoly-scs-ukorACCOUNT-xxxxxxx)project_id: Your PolyAI project ID (for examplePROJECT-191bfa2a)operation:create,respond, orclose
Authentication
All requests must include the following headers (case-sensitive):| Header | Description |
|---|---|
X-API-KEY | Your API key for PolyAI |
X-TOKEN | Agent authentication token (connector) |
Content-Type | Must be application/json |
Example: Create chat
POST/v1/{account_id}/{project_id}/chat/create
Example: Send message
POST/v1/{account_id}/{project_id}/chat/respond
Example: Close chat
PUT/v1/{account_id}/{project_id}/chat/close
Passing custom data with integration_attributes
The integration_attributes field lets you pass custom data when creating a chat. These attributes are accessible in your project functions at conv.integration_attributes.
When to use
- Pass user context (user ID, session ID, authentication status)
- Include customer information (tier, preferences, history)
- Send external system references (CRM ID, ticket number)
- Provide A/B test parameters or feature flags
Accessing in project functions
Pass
integration_attributes when creating the chat. They’re set on the first turn and available throughout the conversation. Store values in conv.state to access them in later turns.Targeting a variant with variant_id
Pass variant_id in the create request body to route the conversation to a specific variant. This is useful for multi-site deployments where different variants serve different brands, languages, or regions.
variant_id is only accepted on POST /chat/create. It cannot be changed after the conversation starts.Notes
createaccepts an optional request body withvariant_idandintegration_attributes.respondrequiresconversation_id;messageis optional.handoffmay appear in therespondresponse withdestinationandreason.closerequires a JSON body containingconversation_id.- Header names are case-sensitive:
X-API-KEY,X-TOKEN. - Use the regional base URL closest to your deployment.

