HostMyApple has hosted Macs since 2009 and sells two things: macOS virtual servers from $24.99/month, which still run macOS Monterey, and dedicated Mac minis from an Intel i7 up to an M6, at $119.99/month for the M4 and $139.99/month for the M6 with 16GB. Billing is monthly, access is advertised through NoMachine, Apple Remote Desktop or VNC, and restarts go through the support ticket system.
Before renting any hosted Mac, four things are worth checking: whether SSH on port 22 and Screen Sharing on port 5900 are reachable from outside the provider's network, whether the preinstalled remote tools are the vendor's own signed builds, how a hung machine gets restarted and how fast, and whether the Mac is wiped between users. Each of these decides whether you can script the machine, run it as a CI runner or trust it with signing keys.
MacRent's answers: SSH, VNC and RustDesk are open on every dedicated Mac Mini M4 or M6 and the ports are printed on your welcome page; the tools are stock Apple-signed builds; our monitoring probes each Mac and repairs a stuck Screen Sharing service on its own, and when a restart is needed we do it; every Mac is wiped and reinstalled before it is handed over. You can rent one online by the day, week or month from $15, and it doubles as a CI/CD build machine.