Bar the vault
A length standard is a bar. Deposit the pool asset into one and it holds the position; the Bar is the only thing that knows what a share is worth, and it tracks that in storage rather than reading its own balance.
How it works
Provide liquidity. Keep it liquid.
Four contracts, one path, and every step is a call you can read on the explorer.
STEP 01
Deposit
You send the pool asset to the Bar. It is accounted explicitly in storage, so a stray transfer into the contract cannot move the share price for anyone.
STEP 02
Mint
The Bar mints Etalons at the current price. The first deposit pays the virtual offset; every later one pays whatever the shares are already worth.
STEP 03
Harvest
Collected fees are pushed into the Bar. The protocol cut goes to the treasury, capped in the contract, and the rest raises every share at once.
STEP 04
Redeem
Burn Etalons, take the underlying back at the price the Bar computes. No lockup, no queue, no epoch — and the mark says which clock it was taken on.
Etalon the share token
An étalon is the physical standard a measurement is made against. Deposit into a Bar and you hold an ordinary ERC-20 — your wallet, a DEX and a lending market all handle it with no special support — whose redemption value rises as fees are harvested in.
Fringe a mark
Two rulers of slightly different pitch laid over each other produce fringes, and the fringe spacing is how metrology sees a difference too small to read directly. A Fringe here is one recorded reading of a Bar’s price, stamped with the block and with whether the market that prices the asset was open at the time.
Comparator the instrument
A comparator does not measure a length. It measures the difference between a length and a standard, which is the only thing that can be measured precisely. Paste any token or Bar on Robinhood Chain and it reads the chain from your browser.
Curie the stop
Invar is only Invar below its Curie temperature. Above it the magnetism that cancels the expansion is gone and the alloy behaves like the steel it is made of. The protocol names its own Curie point: the conditions under which its guarantees stop holding, written down rather than implied.