European Style Expiration

European style expiration refers to an option contract that can only be exercised on its specific expiration date, rather than at any time prior to that date. This limitation simplifies the valuation process for the issuer and the holder because there is no risk of early exercise, which is common in American style options.

Most cryptocurrency options traded on major platforms are European style, as this design aligns better with the automated settlement mechanisms of smart contracts. By restricting exercise to a single point in time, the pricing models become more predictable, facilitating more efficient market making.

This structure is particularly important in decentralized finance protocols where settlement occurs on-chain at a precise block height. It eliminates the complexities associated with managing early assignment risks for option writers.