F Grimy avantoe 4h-cycle volume flip on a persistent ~56gp post-tax spread vetoed

Grimy avantoe is a 30-day-stable herblore secondary with ~390k units/day of volume. Buyers and sellers do not place patient offers — the spread between posted buy and sell offers sits in the 30–60gp range throughout the day. Today's window opened wider (56gp post-tax, z=3.38 vs 2h baseline) because a fresh buy leg printed at 1412 in the last 4 minutes against a 1328 sell offer, on top of a 24h pattern of repeating 30–50gp prints. Sized to the 13k 4h buy limit, this clears the 200k gp/cycle floor with a ~4× buffer.

Entry: Place a buy offer at 1328 gp, fill size 13000 units, refresh once per 4h cycle
Exit: Place a sell offer at 1412 gp, fill size matches buy leg

Kill switch: If post-tax margin <25gp on two consecutive evaluations (4h apart), stand down. If daily close breaks below 1200 or above 1420, the band is no longer range-bound and the sell leg is at risk — kill.

From run 445 · F-grimy-avantoe-20260801