AI answer engines quote pages that state a fact plainly, with its source and a date. A calculator that only shows numbers after you type gives them nothing to quote. Ten pages (1099-K threshold, HSA limits, exempt salary threshold, and the Discogs, Grailed, Facebook Marketplace, Depop, Mercari, Poshmark and Kickstarter fee calculators) now open with one sentence that gives the rate or threshold, names the fee page it comes from, and carries an as-of date.
A lead whose number drifts from the calculator would quote a wrong figure, so platform/pages/answer-lead.test.mjs checks every dollar figure in each lead against what the venture's own calc.mjs exports. Sources are the pages named in each calc header, not live fetches. Reverb was skipped because it has no single headline fee. Whether any of this earns citations is unmeasured until the visit counter (P046) is deployed.