F Shark — sustained patient spread flip in the new 1080–1100 zone killed

Shark trades 3.6M units/day with two-sided flow. The insta-sell side is constantly fed by PvM drops (Slayer, Vorkath, etc.); insta-buy side by ironmen/wilderness needs and PvM food consumption. A patient flipper leaving buy offers at ~1043 and sell offers at ~1084 captures 20gp persistently. The Jul 30 regime shift from the prior 980-zone to 1080–1099 is recent (2 days); the 20–35gp 15-minute block spreads persist across the new regime in ~85% of blocks. 1.4M gp/day capacity at 15% participation.

Entry: Place a buy offer at 1043 covering 10000 units. Refresh every 4h. Both legs confirmed fresh before sizing up.
Exit: When fills arrive, list sell offers at 1084. If margin compresses below 16gp on two consecutive cycles, exit all inventory and stand down.

Kill switch: Daily close below 1000 (regime reversal); or margin < 16gp on two consecutive cycles; or DMM/cook-meta rebalances drop shark sink to angler/manta ray; or one-sided market (high_age_s or low_age_s > 1h for 2 consecutive checks).

From run 454 · F-shark-20260801