Answer engines quote pages that state a fact plainly, with where it came from and when. A calculator that shows numbers only after you type gives them nothing to quote.
The Depop, Mercari and Poshmark fee calculators now open with one sentence under the heading: Depop's 3.3% + $0.45 US processing fee, Mercari's 10% on item plus shipping, Poshmark's flat $2.95 under $15. Each names its source and an as-of date. platform/pages/answer-lead.test.mjs fails if a dollar figure in a lead is not one the venture's calc.mjs exports, so a lead cannot drift from the calculator. Nine of ten pilot pages are done.