Lotus

Lotus is one-way directional liquidity, a maker primitive where inventory only moves one way and never trades back. A normal range order is reversible: if price falls back through it, it re-buys the asset you just sold, so you round-trip your inventory. Big holders therefore avoid on-chain depth. Lotus makes liquidity a directional intent: a maker deposits BASE across ascending price bins, takers buy cheapest-first, and once a bin fills the proceeds become claimable and can never re-enter the market, a monotonic invariant, no keeper, no oracle. Full cycle: entry via a single LI.FI Composer Flow (swap → createLadder from any token/chain); fills from the same ladder exposed on two venues, a 1inch SwapVM ONEWAY_FILL opcode and a Uniswap v4 hook, both converging on one frozen core; idle inventory earns yield in a real ERC-4626 vault (Morpho/Aave), recalled just-in-time on a fill; claim withdraws proceeds that never reverse.

Contracts: Foundry, Solidity 0.8.30, via-IR. A frozen core (LotusPositionManager) holds all ladder/fill/claim logic behind one seam, _quoteBins and _consumeBins share identical math, so a static quote always equals the swap. Every venue routes through the same recordFill.

1inch Aqua: LotusSwapVMRouter is SwapVM inherits the real 1inch SwapVM and adds three custom opcodes (ONEWAY_FILL, ONEWAY_FILL_BEST, ONEWAY_FILL_LIFI) via _instructions(); native settlement moves QUOTE↔BASE, maker is an EIP-1271 signer.

Uniswap v4: Lotusv4Hook is a custom-curve hook (beforeSwapReturnDelta) filling the same ladder, proceeds minted as ERC-6909 then settled via the PoolManager.

LI.FI Composer: the maker entry is one signed Flow (@lifi/composer-sdk): swap → approve → rawCall(createLadderFor) compiled via /compose — deploy a ladder from any token in one signature.

Yield JIT: idle inventory sits in a real ERC-4626 vault (Morpho/Aave), recalled just-in-time inside the fill; a failed recall reverts the swap — no keeper, no oracle.

Hacky bits: a fork test proves the deployed 1inch router on Base is an older 28-opcode build (extruction at index 32 reverts); we size the Composer ladder off the route's guaranteed minimum and use createLadderFor so the maker is the EOA, not the proxy; CREATE2 salt-mining gives the v4 hook its permission flags. 159 tests, many forking real Base state.