Explanation of the method:

I first compared all DEXs on Optimism chain in the optimism.core.ez_dex_swaps table using various criteria and found that two DEXs, Uniswap and Velodrome, are best in all criteria. In the following tabs, I have compared these two DEXs more deeply to see which one is more popular and superior compared to the other, or in other words, which one is the best Optimism DEX.

I compared the token swaps using CONCAT(SYMBOL_IN,' => ',SYMBOL_OUT) code to determine swap order and calculated token swaps in each DEX in separate queries.

In the tab related to swap distribution, I also used the CASE command to calculate swap distribution based on swap size for each DEX.
In the last tab, I displayed the top 10 addresses in terms of swap count and volume, and using the Union command, I compared top users of both DEXs in one chart.

The Uniswap swaps are identified in the PLATFORM column with the name PLATFORM = 'uniswap-v3'.

Uniswap V3 on Optimism

Optimism is a Layer 2 scaling solution that enables near-instant transaction finality and low transaction fees while preserving the security guarantees of Layer 1 Ethereum.

At launch, transactions on OΞ are executed by a single sequencer run by the Optimism team, which periodically posts transactions and the state root (the aggregate update to all account balances, contract code, etc) on the L1 Ethereum blockchain.

The sequencer is kept honest by a network of verifiers, who will monitor transactions and state roots posted to L1. If a verifier discovers malicious behavior they can contest the invalid state root by submitting a fraud proof, which cancels any incorrect transactions and forces the sequencer to forfeit its deposit.

Although OΞ has undergone significant security review, please treat this as a risky, early beta product. It is a complex Layer 2 scaling solution still in need of rigorous battle testing.

At launch, the Optimism team will have full upgrade rights over the bridge contract, allowing them to address any bugs that may arise, but there remains a risk of total loss of funds.

https://support.uniswap.org/hc/en-us/articles/7423895765005-Uniswap-V3-on-Optimism

Velodrome on Optimism

Velodrome Finance, at its core, is a solution for protocols on Optimism to properly incentivize liquidity for their own use cases. Building on top of the groundwork laid out by Solidly, our team has addressed that first iteration's core issues to realize its full potential.

Who is behind this project? The team behind Velodrome Finance previously launched veDAO, an initiative incubated by Information Token. veDAO's founding mandate was to engage with the Solidly ecosystem, a protocol launched on the Fantom network by Andre Cronje, while driving long-term value to the veDAO community.

The veDAO team has since developed deep subject matter expertise on both Solidly, the veNFT primitive, and the ve(3,3) mechanism, becoming the go-to resource for protocols and chains seeking support around these topics.

By the numbers, veDAO, managed to attract $2.6B in TVL (total value locked) in the early days, securing ~10% of Solidly voting power and ~$1.1M USDC in treasury assets.

https://docs.velodrome.finance

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