curl
200 response
remaining is null on plans without a fixed allowance (Enterprise).
When the allowance runs out
There are no overage charges. Once a month’s checks are used up, every call returns429 with quota_exceeded until the allowance resets on the 1st (UTC). Web checks on the same account count toward the same allowance.
A batch needs enough checks left for all its images. If it doesn’t fit, nothing is counted and the error says how many are left.
To keep going before the reset, upgrade on the billing page; the new allowance applies straight away. See pricing for each plan’s allowance.