> 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
* 55% cheaper than OpenSea
* 49% cheaper than LooksRare
#### BNBChain、Avalanche、Polygon
* 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
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.element.market/developer/contract-overview.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.