ETHGas is a hybrid marketplace for sourcing and trading Ethereum blockspace commitments and base fee exposure. It enables users to hedge, speculate, or secure future blockspace by matching buyers and sellers through a centralized limit order book (CLOB), while collateral is secured via non-custodial smart contracts. Validator commitments are backstopped on-chain, combining centralized matching efficiency with decentralized custody and settlement. ETHGas brings transparency, risk management, and market structure to Ethereum blockspace economics.