Volatility is a non-issue with the release of CME futures. You can short Bitcoin or Ethereum futures to lock in your price with respect to USD at any time. The

Volatility is a non-issue with the release of CME futures. You can short Bitcoin or Ethereum futures to lock in your price with respect to USD at any time. The base futures contracts are 5 Bitcoin i.e. notional value of $200k, but that's merely an inconvenience and not a fundamental blocker to subdivide the futures contract or have someone do it for you. I think for years payment companies like Bitpay have had price guarantees for merchants(probably using futures in the backend), but you do have more counterparty risk dealing with unregulated exchanges.