Calypso Pay is described as 'Lets merchants receive payments in crypto from their clients and pay their partners and workers almost instantly with minimal commissions' and is a payment processing service in the business & commerce category. There are eight alternatives to Calypso Pay, not only websites but also apps for a variety of platforms, including SaaS, Wordpress, WooCommerce and Android apps. The best Calypso Pay alternative is CoinGate. It's not free, so if you're looking for a free alternative, you could try NOWPayments or OxaPay. Other great sites and apps similar to Calypso Pay are BitPay, Coinbase Commerce, CoinPayments and ALFAcoins.