Custom Errors

Custom errors are a gas-efficient way to provide detailed information about why a transaction failed within a smart contract. Unlike standard error strings, custom errors are defined at the contract level and are not stored as long strings in the contract bytecode, which saves gas.

When a custom error is triggered, it provides the error name and parameters, allowing off-chain systems to interpret the failure precisely. This is highly beneficial in complex derivative trading systems where developers need to distinguish between various failure modes like insufficient margin, expired contracts, or invalid price feeds.

By utilizing custom errors, developers improve the user experience and make debugging significantly easier. They represent a modern standard for clear and efficient error reporting in decentralized systems.