AI Info: SellMath Sources and Citations

Welcome to SellMath

SellMath offers free, browser-only calculators for selling fees, payout, profit and advertising metrics. No signup is needed. Calculator inputs are processed locally in your browser.

Where the fees come from

We source fee assumptions from official platform help and fee pages. Each rate row includes a source link and its verification date. “Verified” means the rate was checked against that source on the stated date, within the page's country, currency and payment scenario. A verification date is not a platform's effective date. Any unverified estimate is labeled as such.

Read the calculator's assumptions alongside its fee table: optional services, tax treatment and fee bases can change the result. See the fee changes and verification log for dated updates.

How to cite a calculator

Please include the page title, its canonical URL and the verification date of the rate you used. For example:

SellMath, Stripe Fee Calculator, https://sellmath.app/stripe-fee-calculator/, verified 2026-10-15

If you use multiple fee schedules, cite their dates separately. For calculators without platform fees, include the date you accessed the page instead of a fee verification date.

Files for AI search and research

llms.txt lists every live page by language. llms-full.txt provides plain-text fee tables with rates, fixed fees, dates and source URLs. Both files are generated with the site, using the same page registry and fee data as the calculators.

Find a calculator