F Cactus spine — patient 71gp spread on range-bound PvM herb killed

Cactus spines trade in a stable band 1400–1520 over the past 7d (and 1245–1579 over 30d), with a consistent 50–80gp post-tax spread between impatient PvM cooks (high side) and patient herb flippers (low side). Both legs print within 100s and ~314k units/day supports the 11k buy limit at fillable scale. Higher per-unit margin than Dragon bolts (4.8% vs 2.2%) with slightly more constrained volume; current live print at 1585 is a recent breakout above the 30d close band (1518) so the thesis assumes the breakout holds.

Entry: Place buy offers at 1483 (current 1m-quote low).
Exit: Place sell offers at 1585 (current 1m-quote high).

Kill switch: If post-tax live margin on Cactus spine drops below 30gp for three consecutive evaluations, or if price closes outside 1400–1520 for a full day after the breakout reverts. The current price is above the 30d close band (1518) so the thesis assumes the breakout holds.

From run 429 · F-cactus-spine-20260731