F Anti-venom(4) — sustained ~222gp spread on a stable herbal potion killed

Anti-venom(4) sustains a ~222 gp post-tax spread because PvM demand (snakeling, Wyrm, Zulrah stock) drives a persistent buy-side ask wall around 10,100-10,500, while suppliers dump at the bid. The 28d daily close band is 9700-11400 with current close 10541 — only +5% drift, range-bound enough that a flipper's sell leg is not eaten by a downtrend. margin_persistence_24h = 0.58 (25/25 hours saw positive spread); roundtrips_24h = 29 (both legs printing).

Entry: Buy at or below 10109 (live ask). Place a single buy offer for the full 2000-unit 4h limit; cancel if not filled within 4h.
Exit: Sell at or above 10541 (live bid). Place one sell offer for the held units; cancel/relist if not filled within 4h.

Kill switch: Post-tax margin < 100 gp for two consecutive quote checks (i.e. spread has halved). Also: a daily close below 9798 (28d low) means the uptrend has broken — stand down the cycle and reassess.

From run 470 · F-anti-venom-4-20260802