BEX moves heavy computation off-chain to the builder's simulation during block construction. Users define two functions: preCompute(), which is simulated against the exact state of the block so far, and execute(), which runs on-chain using the output.
Pay Only for Execution — Ethereum pays only for the final on-chain execution — not the exploration of thousands of paths.
Live Block State — Simulate against the exact mid-block state during construction, not a stale snapshot.
Atomic Inclusion — Compute result and on-chain execution land together in the same block.
Unlock Complex Strategies — Evaluate swap paths, aggregate storage reads, and run large searches off-chain.
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