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Session initialization

HeyGen required three sequential API calls: Create Session Token → New Session → Start Session. LiveAvatar simplifies this to two calls: Create Session Token → Start Session. The old token creation and session setup logic are unified.

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Session management

HeyGenLiveAvatar
Close SessionStop Session
Keep AliveKeep Session Alive
List Sessions (Active)List Sessions (type parameter)
List Sessions (History)List Sessions (type parameter)

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Task endpoints → Events

HeyGen’s REST task endpoints are replaced by an event-driven architecture:
HeyGen endpointLiveAvatar event
repeatavatar.speak_text
chatavatar.speak_response
interruptavatar.interrupt
The event-driven approach improves responsiveness and reduces latency.

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Avatars and Knowledge Bases

  • Avatar listing split into List Public Avatars and List User Avatars
  • Knowledge Base renamed to Context (all CRUD operations updated)

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API keys

HeyGen API keys are not compatible with LiveAvatar. You need a new key from app.liveavatar.com/developers.