Call wall and put wall

A call wall is the strike above price with the heaviest call positioning, and a put wall is the strike below price with the heaviest put positioning. Traders read them as the day's likely ceiling and floor, because options dealers' hedging tends to sell into the call wall and buy into the put wall. Together they are often called gamma walls.

Why price reacts at a wall#

When dealers are long gamma around a strike, a move toward it makes them trade against the move: they sell as price rises into a call wall and buy as it falls into a put wall. That steady counter-flow is what makes walls act like resistance and support, especially in a calm (positive gamma) regime.

When walls break#

• Negative gamma. Below the gamma flip dealer hedging chases the move, so walls give way more easily.
• The wall is being eaten. Today's flow on the opposite side shrinks the wall during the session. q-bitf tags this as fighting in options flow.
• Expiry. Same-day options behind a wall disappear at the close, so a wall built mostly from 0DTE can vanish into the next session.

After a break, the next wall out (call wall 2, put wall 2) is the usual next target.

A real example#

Reading walls in q-bitf#

• Walls are ranked by strength and drawn thicker the stronger they are.
• A quality badge (STRONG, MODERATE, WEAK) says how much weight sits behind a wall and how close it is to price.
• A live wall only moves when another strike becomes clearly stronger, so it does not flicker.
• The scoreboard shows how often each wall actually held.

See every level in Key levels.

Questions#

What is a call wall?#

The strike above the current price with the heaviest call positioning. Dealer hedging tends to sell into it, so it often acts as resistance.

What is a put wall?#

The strike below the current price with the heaviest put positioning. Dealer hedging tends to buy into it, so it often acts as support.

What is a gamma wall?#

Another name for a call or put wall: a strike with a large concentration of options gamma that price tends to stall at.

Do call and put walls always hold?#

No. They hold more often in a positive gamma regime and break more easily below the gamma flip, or when today's flow is eating into them.