# Overview

The 31Third batch trade smart contracts enable the execution of multiple transactions together as one bundle and collect a configurable fee in basis points of the receiving currency of the trade. The current implementation supports the following:

* Trades through 0xExchangeProxy ([`0xDef1C0ded9bec7F1a1670819833240f027b25EfF`](https://etherscan.io/address/0xDef1C0ded9bec7F1a1670819833240f027b25EfF))
* Wrapping/Unwrapping (W)ETH ([`0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2`](https://etherscan.io/address/0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2))

## Architecture

For easily integrating with other liquidity sources, such as Aave, Curve, Balancer, and more in the future, the contracts utilize the adapter pattern and register the concrete implementations in a registry. The architecture can be seen in the following diagram:

<figure><img src="/files/1hF164HD7NTynmhemJsK" alt=""><figcaption><p>Contract architecture</p></figcaption></figure>


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