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Tracks is prepaid. Your organization has a balance in US dollars, and what its runs consume is taken from it as they go. There is no subscription.

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Your balance

Open your profile menu at the bottom of the sidebar, then Billing. It shows your balance and every transaction: top-ups, free credit, what each run cost, and refunds.
  • Your first sign-in comes with $10 of free credit, unless you joined through an invitation. Free credit never expires.
  • Add funds pays by card on Stripe, then brings you back. A top-up is at least $10; your first one is at most $500. Tax is added at payment, and each top-up has an invoice in Transactions.
A balance belongs to the organization: every member spends from it. See organization and sharing.

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What is charged

Each run pays for what it consumes, at the provider’s list price:
  • The agent’s model requests. For Cursor, what Cursor charged.
  • Sandbox time: how long the run’s sandbox was up, priced by its size.
  • Replies to the agent’s questions: in an experiment, when an agent stops to ask something, a model writes the user’s answer. That call is billed with the run.
tracks runs usage <id> and the run’s page in the web app show what a run cost.

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What is free

  • Judging: evaluating each run against its scenario’s evaluations.
  • Agent tool use: counting how often a run used each of your skills, MCP servers and command-line tools.
  • Importing scenarios or evaluations from a document.
None of these count against a run’s budget.

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Limits that protect your balance

Budget per run. Every run has a budget: once its cost reaches it, the run ends as budget_exceeded. It can go slightly over by the requests already in flight. Defaults and ranges are in budget and time limit. Maximum spend. Before launching an experiment, the Launch dialog shows how many runs start and the most they can spend: the number of runs times their budget. It warns you when that is above your balance. **Balance at $0.** No run starts while your balance is $0 or below, and reaching $0 cancels the runs still running. The API refuses new runs with a link to add funds.
Start with a small budget and one repetition. Raise them once you know what a run of your task costs.