That's what bitcoin futures can be used for, to hedge your BTC position, and you don't have to wait for 10 minutes for your trade to complete. For example, if

That's what bitcoin futures can be used for, to hedge your BTC position, and you don't have to wait for 10 minutes for your trade to complete. For example, if you own 5 BTC and want to hedge the USD value of your portfolio against BTCUSD fluctuation, you can short 1 CME bitcoin contract (http://www.cmegroup.com/trading/equity-index/us-index/bitcoin_contract_specifications.html http://www.cmegroup.com/trading/equity-index/us-index/bitcoi...). If BTCUSD decreases, the USD value of your 5 BTC decreases while you gain the same amount of USD on the short futures position, so you have no net profit or loss in terms of USD. If you acquire a bigger BTC position, you can maintain your hedge by increasing your futures short position. For a big merchant like Steam, at least theoretically, they could accept BTC directly and hedge their BTC position using the futures. Although the granularity of 5 BTC is rather high, for a high-volume merchant that can increase or decrease their BTC holdings relatively quickly, hedging like this should be quite feasible. For example at BTCUSD=15000, 5BTC=75000USD. That means while waiting to accumulate an additional 5BTC=75000USD of revenue so that they can hedge with another BTC futures contract, they are exposed to exchange rate risk. How long does it take Steam to accumulate 75000USD of sales? Their 2016 revenue is said to be 3.5bn (https://www.statista.com/statistics/547025/steam-game-sales-revenue/ https://www.statista.com/statistics/547025/steam-game-sales-...). That amounts to about 5 hours per 5BTC. BTCUSD could change a lot in 5 hours, but if you're a payment processor with 10x larger scale than Steam or think that the up and down fluctuation should roughly even out over the long run, maybe it's still not too risky to accept BTC.