Why this exists
Vapi and Retell only support a single webhook URL per agent for call transcripts and traces. This platform limitation normally forces you to choose between sending data to Tuner or to your existing tools (like an n8n workflow or Zapier trigger), but not both. The webhook proxy removes that limitation. Tuner takes the single webhook slot, then forwards the full call payload on to your original webhook, so you get Tuner’s analysis and keep every automation you already rely on.How it works
When a call ends, Vapi or Retell sends the transcript and traces to Tuner. Tuner runs its analysis and evaluations, then forwards the complete payload to your URL. Your existing automations keep running exactly as before, and you simply gain Tuner on top.Payload is unchanged. Tuner forwards the event using the exact payload structure Vapi or Retell sends, so your existing webhook handler will work without modification.
Setup
Open your agent in Tuner
Select the agent from the sidebar, then open Agent Settings and go to the Webhooks tab.
Paste your original webhook URL
Enter the webhook URL you previously had set in Vapi or Retell (for example, your n8n or Zapier endpoint).
Supported platforms
| Platform | Supported |
|---|---|
| Vapi | ✅ |
| Retell | ✅ |
| Pipecat | ❌ Not yet |
| LiveKit | ❌ Not yet |