Calculator correction
Send the URL, inputs, result shown, expected result, and the source that supports the correction.
Contact FeeProofed
Tell us what changed, what broke, or what would help.
Use this page for calculator corrections, fee updates, source notes, product requests, and useful partnerships. The best messages include the exact page, the numbers involved, and the source we should check.
Send a message
Give us enough detail to check the issue.
The form is best for structured feedback. Email works too if you prefer a direct message.
What to send
Pick the closest reason and be specific.
Fee or source change
Send the official marketplace, processor, or ad-platform page and the date you saw the change.
Calculator request
Describe the decision, the inputs, and the output a seller would need before using the result.
Partnership or editorial
Share the audience, the data or workflow, and where it would help FeeProofed readers.
Response expectations
Accuracy reports and published fee changes are reviewed first.
Messages with a page URL, inputs, and official source link are easier to verify.
We cannot provide individual tax, legal, accounting, or financial advice.
If the form is unavailable, email the same details to the address above.