Steam Community Market fee changelog
Verified against the official pricing page. Open the Steam Community Market calculator.
Initial verification from Steam Support's Community Market FAQ (no revision date stated on the page) and the Steam Subscriber Agreement's Subscription Marketplaces clause. Confidence medium: the Subscriber Agreement confirms a market fee exists and is disclosed before each transaction, but states no percentages or minimums, so it does not independently corroborate the 5% Steam Transaction Fee, its $0.01 minimum, or the 10% game-specific fee.