They are using the "instant exchange" feature of Coinbase: https://coinbase.com/docs/merchant_tools/payouts https://coinbase.com/docs/merchant_tools/payouts Th

They are using the "instant exchange" feature of Coinbase: https://coinbase.com/docs/merchant_tools/payouts https://coinbase.com/docs/merchant_tools/payouts The USD price is locked in, and they never need to hold bitcoin. It is just a cheaper payment method.