Fees.tools, a ledger for what platforms take

Field notes

The site organizes 51 calculators into seven categories, including marketplaces, payments, creator platforms, and app stores. Its verification system records the source, date, and confidence of individual figures, while the changelog preserves changes such as Shopify’s country-specific research and Stripe’s alternative-payment additions. The page also exposes a correction route, methodology, terms, and an RSS feed, making the fee data easier to inspect and monitor than a bare calculator widget.