Oracles - Windrose

The oracle supplies the rate between each currency and the chain’s dollar. Vaults use it to mint and redeem wrapped currencies. The factory uses it once when a launch is created to give every curve comparable dollar depth. Rates are stored as units of currency per one dollar. A rate of 83.5 means one dollar mints 83.5 units before fees.

Fresh, stale, and expired

Rate age	Result
Fresh	Normal fees; vault deposits and withdrawals are open
Stale	Minting and redemption continue with the higher fee; backer moves wait
Expired	Actions that need the rate revert until a new rate is posted

The stale window covers normal FX market closures. It is not a second price source.

Rate sources

The registry points to one rate source. Today, a keeper posts rates from an external FX source and limits how far a rate can move in one update. Pyth and Chainlink sources can be used where available. The oracle is a trust boundary: a bad or compromised rate can change minting, redemption, and the dollar value of a vault. See Risks.