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Butterfly Spread

You think BTC settles at exactly 100k on Friday expiry. Not 98k, not 102k. You don't want to sell a straddle and risk getting destroyed if you're wrong. A butterfly is the cheapest way to bet on a pin.

You buy one option below the target, sell two at the target, and buy one above. The result is a tent-shaped payoff with a sharp peak at the center strike. Risk: whatever you paid. Reward: the width of the wings minus the debit. The ratio can be 5:1 or better.

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The butterfly is the cheapest lottery ticket in options.

What You Do​

The SetupYou pay premium
Buy1 call at lower strike (K1)
Sell2 calls at middle strike (K2)
Buy1 call at upper strike (K3)
Max Profit
Width - debit
Max Loss
Net debit
Upper BE
K3 - debit
Lower BE
K1 + debit

You can build butterflies with all calls, all puts, or a mix (iron butterfly). The payoff is identical; put-call parity handles the rest. Most traders use calls for strikes above spot and puts for strikes below, because the liquidity is better.

How the P&L Works​

  1. Below K1 or above K3. All options expire worthless (or fully offset). You lose the debit. This is the most likely outcome. Accept that going in.
  2. Between K1 and K2. The long lower call gains value. P&L improves as you approach center.
  3. At K2 (center strike). Max profit. The long call is maximally valuable. The two short calls are ATM with no intrinsic.
  4. Between K2 and K3. The short calls eat into your gains. P&L declines back toward zero.

Worked Example​

BTC at 97,200 on Wednesday afternoon. You think Friday's 100k strike is the magnet. Max pain is there, open interest is massive, and the market has been grinding toward it all week.

Buy 1x 95k call. Sell 2x 100k calls. Buy 1x 105k call. 2 days to expiry. Net debit: 1,350. Width: 5k.

BTC at Expiry
P&L
Result
$90,000
-$1,350
Max loss
$95,000
-$1,350
Max loss (at lower wing)
$96,350
$0
Lower breakeven
$100,000
+$3,650
Max profit (pin!)
$103,650
$0
Upper breakeven
$105,000
-$1,350
Max loss (at upper wing)
$112,000
-$1,350
Max loss

Risk 1,350 to make 3,650. That's a 2.7:1 reward-to-risk. But only if BTC pins within 3,650 of 100k. The probability of hitting max profit is low. The probability of hitting some profit is moderate. That's the trade-off.

Explore the Payoff​

Spot at Expiry$100k
$70k$130k
Net Debit$2k
$1k$4k
BE $97kBE $103k$0+$3k-$2k$70kK1 $95kK2 $100kK3 $105k$130kSpot Price at ExpiryP&L
Settlement
$100k
P&L
+3.0k
Max Loss
-$2k
Max Gain
+$3k

When to Use​

  • You have a specific pin target. Max pain, a round number like 100k, or an options expiry level with massive open interest
  • You want a cheap shot with defined risk. Butterflies cost a fraction of a straddle
  • You're targeting near-expiry setups where the payoff spike sharpens. A 0-DTE butterfly centered on the expected settlement price can cost very little and pay out 5:1 if the underlying pins
  • You understand you're trading low probability, high payoff and you size accordingly

Butterflies are precision instruments, not income strategies. You'll lose most of them. The ones that hit make up for the losses and then some, if you keep the debit small and the target sharp.

Common Mistakes
The mistakeBuying butterflies too far from expiry.
The realityA butterfly with 30 DTE has a rounded, shallow payoff. The tent doesn't sharpen until the last few days. Butterflies work best inside 5 DTE when gamma makes the payoff peak razor-sharp. Most pros use them as 0-2 DTE expiry plays.
The mistakeHolding to expiry hoping for a pin instead of taking partial profit.
The realityIf BTC is sitting at $99.5k with 4 hours to go and your butterfly is up 60%, take the money. The pin can evaporate in a single candle. Butterflies are lottery tickets -- you cash winning tickets, you don't let them ride.
The mistakePlacing the center strike at current spot instead of the expected expiry price.
The realityIf BTC is at $97k but max pain is $100k and OI is concentrated there, center the butterfly at $100k, not $97k. You're betting on where BTC lands, not where it is.

Greeks at a Glance​

Greek
Sign
Plain English
Delta
~0
Roughly neutral at entry. The two short calls cancel the deltas of the longs.
Gamma
+/-
Positive near wings, negative at center. Near expiry, gamma at the center strike gets extreme in both directions.
Theta
+/-
If spot is near center: theta positive (the short calls decay in your favor). If spot is near the wings: theta negative (your long option is decaying).
Vega
-
Benefits from falling IV. A tighter realized distribution means a higher chance of pinning. IV crush after an event can help a butterfly already near center.

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