Routstr also supports the x-cashu (NUT-24) header protocol .. u don't need to have any balance by ur provider, basically u pay per request .. u will need to have a client that can extract the model cost per request and can generate a cashu token .. https://otrta.routstr.com/documentation/overview
Other projects are following
https://njump.me/nevent1qqsfqhkmy50fw6l3kw3c6pr9f8pzpc3r36ce44wz3awzkflcczs26wcppemhxue69uhkummn9ekx7mp0qgsthdwa5rs42euhnuz5xsrmmssr84hshwes7uj392vpeldj7z0zw3crqsqqqqqpn7fhyt
