Zeus runs a node on your phone.

(one of many) UX hurdles for LN is that it doesn't work unless youre online.

So Zeus puts your sats in limbo for you until you come online to receive. If you dont, they expire.

For zapping the best thing I found is nostr:nprofile1qqsf07zg4hxyccnkdp07fppxmetpfzru3fg6mgzx3nk8r7af8qnjjygpp4mhxue69uhkummn9ekx7mqpr3mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmqpzpmhxue69uhkummnw3ezumrpdejq52q4x7

you can run your own node there for extremely few sats. they hold the keys (custodial!) but you can completely administer your own node and get a feel for how LN works.

Id check it out and read their documentation even if you dont want to use the service. They clearly are interested in educating about LN.