SurfLiquid is an on-chain DeFAI (DeFi + AI) agent that manages stablecoin yield for users in a fully non-custodial way. Users connect a wallet, deposit USDC to a personal smart vault, and the agent allocates across vetted lending markets and liquidity pools, rebalancing and compounding automatically. Every action is on-chain and auditable. The system targets practical problems in yield management: missed rebalance windows, gas drag, fragmented pools, and manual monitoring. Surf runs on Base first and integrates a multi-chain execution layer so strategies can expand across EVM networks without users bridging manually. Guardrails include protocol allowlists, position caps, and continuous health checks. The $SURF token powers access to strategy tiers, staking rewards via the Conviction Vault, and governance over parameters like pool allowlists and fee settings. In short, SurfLiquid provides a transparent, self-custodial way to put idle stablecoins to work with AI handling execution and reporting.