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.