Credits

Each admitted request reserves credits for its operation (x-credit-operation); the reservation is settled when the job completes and released when it fails, so a failed job is never billed. Balances, grants and the per-call ledger are in the console under Billing and Developer → Logs. Requests made with a test-mode key are the one exception: they reserve nothing, settle nothing and leave no line on the ledger — see Test mode.