EVIDENCE-BACKED MARKETPLACE FEES
Know the number. See the rule. Verify the source.
Calculate supported US marketplace fees with deterministic rules, then trace every fee line to reviewed evidence and an official source.
Ruleset
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01
Local browser
Marketplace calculation
Optional profit inputs
These stay in your browser and are not part of the marketplace rule engine.
Prototype scope: selected US fee categories only. Unsupported or missing contexts return an explicit status instead of guessing.
02
READYCalculation receipt
Enter a scenario to calculate.
The result will show fee lines, rule IDs, evidence status and official source links.
RULE PROVENANCE
Every published fee should have a traceable reason.
REAL-WORLD VERIFICATION
Backtest the rule engine against actual settlement fees.
CSV parsing and comparison run in your browser. The prototype does not upload the selected file.
Local onlyOrder IDs and raw transaction rows remain on this device.