Seems like a bit of a strange implementation:

  Under Payment settlement, select one or more blockchain
  networks for stablecoin payments. Any wallet address on
  the supported networks is accepted, whether self-managed
  or hosted by a wallet provider such as Coinbase.

  For each network, provide your wallet address and set a
  Base price per page in USDC. You can add multiple networks
  using Add network.

  AWS does not process payments or take a fee on content
  revenue; disbursement is self-managed or managed by your
  wallet provider.