How are free transfers and swaps made possible on everPay?

They're made possibly by using our storage-based computing paradigm. All transactions done on everPay are stored onto Arweave. For now, we, everPay, do not charge any fees in order for transfers/swaps to be made. This may change in the future.

If you wish to know more about SCP (Storage-based Computing Paradigm) do read more about it here: medium.com/everfinance/storage-based-consensus-paradigm-a85c7a398a53