Coinos is a custodial wallet service. They custody their users' Bitcoin and keep a record of each user's balance.

You can use it to receive payments even if you are offline or connect it to sites like stacker.news for sending and receiving Bitcoin payments.

Because you don't have full control of your Bitcoin deposited there, you want to keep just a small amount.

This script regularly checks your balance in Coinos and automatically transfers whatever exceeds a threshold to a Bitcoin wallet that only you control.