A put option is a derivatives contract that gives the buyer the right, but not the obligation, to sell an underlying asset at a predetermined price, called the strike price, within a specified time period. In crypto, the underlying asset is often BTC or ETH, and the option is typically traded on an options exchange and priced via an upfront premium paid by the buyer.
How a put option works in crypto
When you buy a put, you pay a premium for downside protection or bearish exposure. If the market price falls below the strike, the put becomes valuable because it allows you to sell at the higher strike price. If the market stays above the strike, the put can expire worthless and the buyer’s loss is generally limited to the premium. The seller, also called the writer, receives the premium but takes on the obligation to buy the asset at the strike if the buyer exercises or if the option settles in-the-money.
Crypto options are commonly European-style, meaning they are exercised only at expiry, and many are cash-settled, meaning profits and losses are paid in cash or crypto rather than delivering the underlying asset.
Common uses and practical examples
A common hedging strategy is a protective put. For example, an investor holding BTC can buy a put with a strike near their desired floor, so a sharp drop is partially offset by gains on the option. Puts are also used to express a bearish view without shorting spot directly. For instance, a trader expecting volatility to the downside may buy puts instead of borrowing and selling BTC, which can introduce liquidation risk.
Put options matter in the crypto ecosystem because they enable more sophisticated risk management, help participants hedge spot exposure, and contribute to deeper, more resilient derivatives markets.