Given Staked’s ETH2 validators are non-custodial (you always hold custody of the withdrawal key), it is not possible to pay via reward share.
Yes, Staked uses Coinbase Commerce to manage cryptocurrency payments. At this time, you can pay via Bitcoin, Ethereum, DAI, USDC, Litecoin, or Bitcoin Cash.
Yes, Staked uses Stripe to manage credit card payments.
ETH2 transfers are not enabled until at least Phase 1 (learn more about ETH2 phases). A One-time payment will cover your validators until Phase 1 or when transfers become available.
Monthly payments are a recurring bill, charged monthly for the number of validators you have. If using Stripe, you will be charged automatically to the card on file. If using Coinbase Commerce, you will be sent an invoice via email and must pay through an on-chain transaction every month.