# How it works

Vexy consists of [listings](https://docs.vexy.fi/listings "mention") and [offers](https://docs.vexy.fi/offers "mention"). In both cases, users retain custody of their NFTs and fungible tokens until a sale is consummated. Buyers and sellers simply grant allowances to the Vexy marketplace contract when creating listings and offers.

Security is ensured by only allowing a small number of whitelisted currencies and NFTs to be traded. Currently, purchases can be made using AERO, USDC, and WETH while veAERO is the one supported NFT collection. We look forward to supporting additional tokens in the future as the market grows.

Prices are denominated in the token chosen by the seller and this same token must be used by the buyer. For example, a seller may choose to list veAERO for some amount of USDC. This will cause the discount rate to change with AERO/USDC volatility. But a buyer will be required to pay the same amount of USDC specified in the listing. Pro tip: it's much simpler if we all just buy and sell using AERO.
