> For the complete documentation index, see [llms.txt](https://docs.element.market/developer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.element.market/developer/contract-overview.md). # Contract Overview Element V2 is a decentralized NFT marketplace protocol, We try to design a gas-optimized solution with the most NFT swap features. It inherited a groundbreaking modular architectural from 0x V4, we add more new feature for buy/sell NFTs, spend countless hours optimizing the protocol to be the most gas-optimized protocol. [GitHub](https://github.com/element-market/ElementEx)
## Gas-Optimized Every action in a decentralized network cost gas, especially in Ethereum gas is very expensive. We do a lot of code optimization and architecture adjustment for gas optimization, and achieved significant results. #### Ethereum ![Ethereum gas benchmark](/files/g7LCW04VRCj8GX20Azim) * 55% cheaper than OpenSea * 49% cheaper than LooksRare #### BNBChain、Avalanche、Polygon ![BNBChain、Avalanche、Polygon gas benchmark](/files/0m6rUqHCdjKfRPW8TEqA) * 78% cheaper than tofuNFT * 57% cheaper than NFTrade \[Test case] [one fee,](https://rinkeby.etherscan.io/tx/0x19fab2c17e9715ef8e4959f9a1d5315474f4dc070e5987f9cfaf6140dbb0ff08) [two fee](https://rinkeby.etherscan.io/tx/0x09e19608c1afe0b623c5e8982c2fd760ab2ed8906b9adb8c3164970016b3c092), [zero fee](https://rinkeby.etherscan.io/tx/0x46aa925b27c1adf5765ec1224f09274478013dc9e36fc730ba65aed259a02622) ## New Features To bring better liquidity for NFT buyer and seller, many new features have been added to Element V2: * Collection Offer * Instant royalties for creator * Mixed Payment with ETH + WETH * Multi Cancellation - cancel all active orders in one transaction * English Auction * Dutch Auction * Scheduled Listing ## Upcoming Features Some advanced features have been added to the roadmap * Property Offer - buy an NFT with specified property in a collection