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Check balance

GET /v1/balance returns the balance owned by the supplied API key. It accepts no user or account selector, calls no image service, and costs nothing.
The snapshot is serialized with credit reservation, settlement, and restoration. Balances cannot be negative. Responses use Cache-Control: private, no-store, Pragma: no-cache, and Vary: Authorization, so shared caches must not retain one account’s balance. Use available to decide whether to start a one-credit image request. Other account, rate, spend, or concurrency limits can still refuse a submit. Handle the documented error contract on every request.