On both Arbitrum and Optimism, Uniswap is contemplating layer-two deployments. UnisWap v3 outperforms v2 in terms of daily volume, although accounting for only 26% of the total value locked in v2. In 2019, Arbitrum secured $3.7 million to investigate smart contract scalability, and the first Rollup system was launched in early 2020. Competing second-layer scaling solutions have been able to gain market share, with Polygon taking the lead after Aave drew a 10-figure TVL on the network.