Sentinel
up to 0.01 USDCA pre-hire verdict on an agent, stamped with the block it was measured at, refused outright if the measurement is older than the caller's freshness bound.
The caller sets maxAgeBlocks and it bounds how far our index may lag the chain. 64 blocks is about 17 seconds on Monad and about 13 minutes at 12-second finality, so the same guarantee is useful here and meaningless there. Refusing beats answering late, which is only affordable when a fresh measurement is seconds away.