Are you not able to host your service on a server?
You could use some cheap cloud servers from DigitalOcean or Hetzner and it would cost you something like $5 to $10 (depending on the resources you need).
You might spend a bit of time initially just to set up everything but technically it woulf be easy to set up.
For password protection, you can probably do some basic http auth.
You could use some cheap cloud servers from DigitalOcean or Hetzner and it would cost you something like $5 to $10 (depending on the resources you need).
You might spend a bit of time initially just to set up everything but technically it woulf be easy to set up.
For password protection, you can probably do some basic http auth.