Square has introduced Bitcoin payments through the Lightning Network, allowing over 4 million U.S. merchants to accept BTC instantly at checkout. This new feature, effective November 10, 2025, excludes New York and offers zero transaction fees until 2027. Merchants can choose to settle in either Bitcoin or USD, with a 1% fee applying from 2027 onwards. The Lightning Network supports rapid payments, reducing dependency on traditional card networks and eliminating chargebacks.