X2Y2 allows you to list items for sale and make WETH offers on others' items without having to send separate transactions each time. This is achieved by first sending one-off approval transactions that enable X2Y2 to:

  1. Transfer your items from a specific collection (if you are listing them for sale)
  2. Spend your WETH (if you are making offers)

Once X2Y2 has the necessary approvals, you can list items for sale and make WETH offers by signing messages with your wallet. The SDK supports both of these functionalities and abstracts away the creation of signatures