How we verify fees & formulas

1. Fees come from the source

We take every rate from the platform's own published pricing or fee page — not from third-party summaries. Each calculator links its sources at the bottom of the page so you can check them yourself.

2. Everything is dated

Fees change. Each fee calculator shows a "Fees last verified" date. All rates live in a single configuration file, so when a platform updates pricing we change it in one place and the date refreshes everywhere it's used.

3. The math is tested

Each formula is a pure function with unit tests covering normal cases, edge cases (zero and very large amounts), currency rounding, and the reverse "what to charge to receive X" calculation. We round money explicitly to the cent so results match what the platform actually deducts.

4. Country-aware by design

Many platforms charge different rates in different countries. Where that's true, the calculator includes a country selector and the percentages, fixed fees and currency formatting all update together.

5. Estimates, not advice

These tools are for estimation. Platforms may apply additional fees (taxes such as VAT/GST, currency conversion, chargebacks, or negotiated custom rates) that a general calculator can't know about. Always confirm the final figure with the platform before making decisions.