More like a service to make non-custodial lightning payments simple.

Using the API abstracts away all the nostr + lightning involved in using nwc, and allows devs to use a familiar REST interface to say userA wants to pay userB 200 sats.

nostr:note123dy3h3yun0pzyrdr43sfkj5p7nl86ys4a4hmq5v4acd8fcslqxssdx8kz 

 Cool. But ultimately it’s User A’s wallet that the funds are coming from? Via an invoice? 

Sorry, haven’t yet had a chance to read the docs. 

 To send a user needs to be created with an NWC  and to receive they need to have a lightning address for getting an invoice.

Users can also "receive" without a lightning address, and when they do add a lightning address all the pending payment requests will be sent out. 

 It’s a REST API for zaps. They’re storing NWC connection strings for users on their server. Then they use those strings to send zaps.