An option spread is a strategy that combines buying and selling multiple options on the same underlying asset, with different strike prices, expiration dates, or both. By pairing a long option with a short option, the trader caps both risk and reward – the short leg offsets part of the long leg’s cost, while the long leg limits the short leg’s downside.

Spreads are the workhorse of structured options trading. Naked options expose the seller to unlimited (or near-unlimited) loss; spreads bound that loss to a known maximum, making them practical for both retail traders and on-chain protocols that need to collateralize positions.

Debit spreads vs. credit spreads#

Every spread falls into one of two categories based on cash flow at entry:

• Debit spread – the trader pays a net premium. The purchased option costs more than the sold option. Profit comes from a favorable move in the underlying.
• Credit spread – the trader receives a net premium. The sold option is worth more than the purchased option. Profit comes from time decay or the underlying staying in a favorable range.

The distinction matters for collateral: a debit spread’s maximum loss is the premium paid, while a credit spread’s maximum loss is the width of the strikes minus the premium received.

Spread taxonomy#

Spreads are classified by which variables differ between the legs:

Vertical spreads#

The most common category. Two options of the same type (calls or puts) with the same expiration but different strikes. These express a directional view with bounded risk. See the dedicated vertical spread page for payoff profiles and examples.

Calendar spreads#

Same strike, different expirations. The trader is primarily betting on implied volatility changes or exploiting the faster time decay of the near-term option. Maximum profit occurs when the underlying is at the shared strike at the short option’s expiration.

Diagonal spreads#

Different strikes and different expirations – a hybrid of vertical and calendar spreads. These offer more degrees of freedom but are harder to reason about. The trader is typically combining a directional view with a volatility view.

Multi-leg spreads#

Some strategies combine two vertical spreads into a single position:

• Iron condor – a bull put spread and a bear call spread. Four legs, all same expiration. Profits when the underlying stays within a range. Maximum loss is the wider of the two spreads’ widths minus the total premium received.
• Iron butterfly – similar to an iron condor but the short put and short call share the same strike. Higher premium collected, narrower profit zone.
• Butterfly spread – three strikes, same option type. Buy the wings, sell the body (or vice versa). Profits from low volatility when the underlying expires near the middle strike.

Spreads in DeFi#

On-chain options protocols like Lyra, Dopex, and Premia support spread construction, though with important differences from traditional markets:

• Collateral efficiency – some protocols recognize that a spread’s max loss is bounded and reduce the collateral requirement accordingly. Others require full collateral on each leg independently, making spreads capital-inefficient.
• Settlement – DeFi options typically settle in the underlying or a stablecoin, with smart contracts handling exercise automatically at expiration.
• Liquidity – constructing a multi-leg spread requires liquidity at each strike. On-chain options markets are thinner than their TradFi counterparts, so slippage on each leg can erode the spread’s expected payoff.

Choosing a spread#

The right spread depends on the market view:

The option Greeks – particularly delta, theta, and vega – determine how a spread’s value changes as the underlying moves, time passes, and implied volatility shifts. Understanding them is essential for selecting strikes and managing open positions.