- Estimate Credits — a prepaid balance purchased in packs of 5, 10, or 20. One credit covers up to 99-per-estimate-type fee is charged when you submit the request. If the final estimate value runs higher than your applied credits cover, you can stack additional credits when you accept it to close the gap.
- Pay as You Go — no upfront purchase; the same 6,600 threshold, charged when you accept the estimate.
Credits stack additively on top of the pay-as-you-go threshold rather than replacing it — so applying credits always lowers your overage fee, never resets it. If you request with Credits and don’t have enough balance, you’ll need to buy more or switch to Pay as You Go before resubmitting; there’s no automatic fallback to charging your card for the difference.
Buy credit packs from Settings → Store, and see your balance and full purchase/usage history under Settings → Billing. The Store is also where a couple of other purchase-related odds and ends live — like affiliate links to recommended field hardware (currently an Insta360 camera) — alongside the estimate request flow itself.

