Usage & billing

API usage draws from your API credits, which are separate from Studio credits. Your API plan includes monthly credits, and you can top up any time in Developers → Plans & billing. Rates:

What	Billed per
Live voice (`voice` mode)	Minute of microphone audio processed
Agent	Minute of remote audio processed
Typed lines (`say`) and `/v1/tts`	1,000 characters
Voice clone	Each

Sessions are reserved up to what your balance can cover (and maxMinutes). They are charged for actual use when they end.

`GET /v1/usage`

{
  "credits": 4182.5,
  "plan": "pro",
  "sessions": [
    {
      "id": "94c3e928-…",
      "status": "closed",
      "startedAt": "2026-10-14T15:43:49Z",
      "endedAt": "2026-10-14T15:47:12Z",
      "creditsCharged": 38.4,
      "seconds": { "voice": 192, "agent": 0 },
      "typedCharacters": 41,
      "metadata": { "endUser": "u_42" }
    }
  ]
}

Use metadata from POST /v1/tokens to attribute costs to your own users.