The yield trade that never stops
Holders of BTC and ETH sit on volatile, yieldless assets — so selling calls against the stack became crypto’s dividend substitute, run by funds, treasuries and structured products alike. That flow arrives continuously: every week, upside strikes get sold by people who want income, not exit.
From flow to wall
Dealers who buy those calls carry long gamma at the sold strikes — and concentrated overwriting builds exactly the strike-stacked positioning read as the call wall. Alongside miner hedging, overwriter supply explains why crypto’s upside is structurally sold: two persistent seller classes, no equity-style buyback bid to oppose them.
When the overwriters get run over
The flow’s weakness shows in vertical rallies: sold calls go deep in-the-money, some overwriters buy them back or roll up in a hurry, and that repurchase adds fuel precisely when the wall is failing. An overwritten book dampens ordinary strength and feeds exceptional strength — the same flow, two regimes.
Reading it
Persistent call-wall rebuilding at similar deltas is the overwriters’ signature; watch how the wall behaves in a fast rally versus a drift. Supply that rolls calmly is structure; supply that panics is fuel.