According to official announcements, Uniswap v2 has been launched on six blockchains, including Arbitrum, Polygon, Optimism, Base, Binance Smart Chain, and Avalanche. Users can seamlessly swap and provide liquidity on all supported chains directly through the Uniswap interface. As both v2 and v3 are available on all supported networks, users have the flexibility to choose between the simplicity of v2 and the advanced features of v3.