top of page

UniswapX Preview

The UniswapX Protocol is a decentralized trading protocol built on the Ethereum Virtual Machine, utilizing Dutch auction-based trading and signed offchain orders executed on-chain. It aggregates both onchain and offchain liquidity, incorporates MEV (Miner Extractable Value) in the form of price improvement, enables gas-free swaps, and supports cross-chain trading.

Key features of UniswapX include:

  1. Dutch Orders: UniswapX employs a Dutch auction model, where the price of an order decays over time until it reaches a minimum acceptable price for the swapper. This incentivizes fillers to quickly find the best price for swappers while still ensuring a profit for themselves.

  2. Signed Orders: Instead of submitting transactions, swappers sign orders specifying various parameters, including input and output tokens, amounts, decay function, claim deadline, and authorization for the UniswapX reactor contract to spend tokens on their behalf.

  3. Cross-Chain Orders: UniswapX can be extended to support cross-chain trading, allowing swappers to trade assets between different blockchain networks. This is achieved by utilizing settlement oracles and filler bonds for secure and fast asset transfers.

  4. Parameterization and Fees: UniswapX does not enforce specific decay functions, allowing flexibility for different implementations. Governance can set a fee of up to 0.05% on swaps, and interfaces and wallets can charge additional uncapped fees.

UniswapX is aimed at improving onchain trading and self-custody swapping. The protocol is designed to outsource routing complexity to a network of third-party fillers who compete to fill swaps using onchain liquidity, streamlining the process for swappers. It aims to provide the best prices transparently recorded and settled onchain. Swappers sign offchain orders, and fillers submit them onchain, paying the gas fees. This gas-free swapping reduces the need for native network tokens and eliminates costs for failed transactions.


UniswapX also addresses the issue of MEV by returning the value that would have been captured by arbitrage to swappers through improved prices. It further protects users from extractive MEV practices, making orders executed with fillers' inventory less vulnerable to manipulation.

Future Plans

In the future, UniswapX plans to launch a cross-chain version, allowing users to seamlessly swap between different blockchain networks. Swappers can choose the assets they receive on the destination chain, enhancing flexibility.


UniswapX is being launched as an opt-in beta on the Uniswap Labs interface. The smart contract is immutable and permissionless, and Uniswap Labs cannot modify or pause it. However, other builders can launch their own front-ends for the smart contracts.


UniswapX aims to enhance the swapping experience through various improvements:

  1. Enhanced prices by consolidating liquidity sources.

  2. Gas-free swapping, reducing the need for users to pay gas fees.

  3. Protection against MEV, ensuring users get fair prices and avoid value extraction.

  4. No charges for failed transactions, offering a risk-free trading experience.

  5. Additionally, UniswapX plans to extend its capabilities to support gas-free cross-chain swaps later this year.

Read more about UniswapX here:


Follow us on twitter at @0x_Bastion, @BlakeARichman

And check out our substack at

This Content is for informational purposes only, you should not construe any such information or other material as legal, tax, investment, financial, or other advice. Nothing contained on this site constitutes a solicitation, recommendation, endorsement, or offer by Bastion Capital Partners or any third party service provider to buy or sell any securities or other financial instruments in this or in in any other jurisdiction in which such solicitation or offer would be unlawful under the securities laws of such jurisdiction.

All Content on this site is information of a general nature and does not address the circumstances of any particular individual or entity. Nothing in the site constitutes professional and/or financial advice, nor does any information on the site constitute a comprehensive or complete statement of the matters discussed or the law relating thereto. You alone assume the sole responsibility of evaluating the merits and risks associated with the use of any information or other Content on this site before making any decisions based on such information or other Content. In exchange for using this site, you agree not to hold Bastion Capital Partners, its affiliates or any third party service provider liable for any possible claim for damages arising from any decision you make based on information or other Content made available to you through this site.
2 views0 comments

Recent Posts

See All

Tokenomics and Governance in DeFi Projects

Decentralized Finance (DeFi) projects have ushered in a new era of financial innovation, granting users greater control over their financial assets and decisions. At the heart of many successful DeFi


bottom of page