Corrections

Corrections policy

Last reviewed July 2026

What can be wrong — and how we catch it

FeeFloor publishes two kinds of number, and they fail in different ways. Spread and slippage are measured livefrom each venue’s order book; if the book is briefly unreachable, the affected rows keep their last measured value with a visible timestamp rather than showing a fabricated one. Fees are maintained by handagainst each venue’s official schedule; the usual way a fee goes wrong is that a venue changes it and our table hasn’t caught up yet. Both automated checks and reader reports feed the queue.

How we handle stale or missing data

• Timestamps, always.Every number shows when it was measured. If it’s old, you can see that it’s old.
• Last-good over fake-fresh. When the engine is briefly down we hold the last verified numbers instead of blanking the table or inventing new ones.
• Depth-limited is excluded, not estimated. If a book can’t fill the requested size, that row is marked depth-limited and left out of the ranking rather than given a flattering guess.
• No silent padding.We don’t extrapolate a venue’s cost from a smaller size to make it look competitive.

How to report an error

Traders and exchanges are both welcome to flag problems — a venue reporting its own fee change is handled exactly like any other report: verified against the source, then applied. Email corrections@feefloor.com and, where you can, include:

• the venue and the market (spot or perpetual futures);
• the figure you think is wrong and what it should be;
• a link to the official fee page or announcement that supports it;
• roughly when you noticed it, so we can tell a stale reading from a genuine error.

What happens after you report

• We verify against the source— the venue’s own fee schedule or announcement — not against another comparison site.
• Confirmed errors are fixed at the source in the fee tables, so the correction flows to every page that uses that number, usually within one business day of confirmation.
• Material changes are logged below — a fee correction that could have changed a ranking is worth recording in the open.
• We’ll close the loop and tell you what we found, including when we conclude the number was already right.

Correction log

Material corrections — the kind that could have changed which venue looked cheapest — are recorded here with the date and what changed. There are no entries yet since launch. When there are, they’ll appear here rather than being quietly edited away.

For how the underlying numbers are produced in the first place, see the methodology; for who stands behind them, the about page.