Overview
The preview-only sibling of /yield/build: the same on-chain reads and expected shares/assets from the protocol's preview (Aave/Compound 1:1 underlying; ERC-4626 previewDeposit/previewRedeem), plus the same safety flags — Aave active/frozen/paused and supply cap, Compound III supply/withdraw pause, and the empty-vault inflation-attack warning for ERC-4626 — but WITHOUT building any transaction calldata or approval, so it is cheaper and needs no recipient (except erc4626 redeem