MetaMask has integrated the Uniswap API as one of its exchange service providers, allowing users to directly access Uniswap v2, v3, v4, and UniswapX. MetaMask chose to integrate the Uniswap API based on its liquidity depth, pricing, and infrastructure spanning more than 16 chains. This API previously provided exchange services for Uniswap Labs' own applications, as well as products from OKX, Talos, Fireblocks, Anchorage Digital, and Ledger. The Uniswap protocol has a total historical trading volume exceeding $4 trillion. Uniswap API integration is free, with no subscription or call fees. Developers can generate API keys and integrate exchange functionality through the Uniswap Developer Platform.