How the weir holds

One call mints a reach's full catchment and opens its pool at the weir's set level on Uniswap v4 — native ETH on one side, the coin on the other, no oracle and no signer anywhere. Metadata (image, blurb, link, X) is required; a reach is never impounded bare.

Part of the catchment is seated as the pool's liquidity, from the opening level down, so there is always water to trade in. In the same transaction the position goes into the Caisson with a permanent seal: release() reverts on it forever. Custody is a public read, not a promise.

The creator's share goes straight into the Ladder, split across pools, each behind a gate set a long climb above the last. The Crest hook writes the pool's high-water mark on every swap; ascend() pays a pool to the keeper only once the mark has passed its gate. There is no other path: no owner, no timer, no override.

Every swap on the home pool pays a small, fixed skim of its ETH side at the crest. It accrues in the keeper's basin inside the hook and is withdrawn with drawdown(). The house takes no cut of trades — its only revenue is a flat fee on optional Caisson and Boom locks.

ETH sent along with impound() is spent as a first buy inside the same transaction — same pool, same skim, no privileged price. What a keeper buys at the open, everyone can see in the Impounded event.

A plain lock-and-vest (moor a lump until a date, or let it seep out slowly) ships alongside, so a keeper who wants to prove more restraint can. The site only ever reports what the chain shows.