Returns Ethereum block header + stablecoin depeg status + top DeFi yield farming pools in one call. Collapses the 3-hop eth-block → stablecoin-watch → yield-farming chain into a single call. All three upstreams fetched in parallel. Supports Ethereum, Base, Polygon, Arbitrum. Filter yield pools by chain, protocol, min TVL, min APY. Free upstreams — DRPC + DeFiLlama — no API key required.