ArcadeServers has no subscriptions; it has a prepaid wallet. For every hour your server runs, its hourly price is deducted from your balance.
NOTHING is charged while the server is STOPPED. Stop and start whenever you like — you only pay for the hours you use.
Every deduction is itemized in the wallet history: which server, which hour range, how much. No surprise charges.
You get an e-mail warning at low balance; if it runs out, servers sleep and their worlds are archived. Top up and continue where you left off; without File Protection the archive is kept for 14 days, and if you don't top up enough within that time the world is reset.