Cryptocurrency is good, but I won’t recommend it to a small business. A small business that is making use of cryptocurrency might be experiencing loss, because of the processes that will be involved in converting and withdrawing their money. Big businesses are the ones that can accept Bitcoin, because they will still cover up the fees and wouldn’t mind if the price of Bitcoin drops.
Small businesses can catch up without incurring losses from the exchange rate.
They just need to use an instant service of converting bitcoin to fiat to the time the purchase was made. There are lots nowadays that offer such a service.
If direct BTC transfer, no API, no third-party, then we can say that the merchant is ready to deal with the risks.