# What is "Custom Gas Fee" and "Just-In-Time Gas"

In the context of Initia's platform, "Custom Gas Fee" and "Just-In-Time Gas" are innovative features designed to enhance the user experience and flexibility in managing transaction costs within the ecosystem.

#### Custom Gas Fee

Custom Gas Fees allow users and developers on the Initia platform to specify which tokens can be used to pay for transaction fees (gas) on Minitias, the Layer 2 application blockchains built on Initia. This feature enables a broader spectrum of possibilities for rollups, potentially lowering barriers to entry, improving user experience, or adding utility to specific tokens. For example, tokens like $wstETH, $USDC, $INIT, $BITCOIN, $sDAI, or a project's own tokens could be excellent options for paying gas fees. This flexibility allows for innovative economic models and enhances the usability of the platform by allowing users to hold a single token in their wallet for various operations, thereby simplifying the user experience.

#### Just-In-Time Gas

Just-In-Time Gas addresses the common frustration of needing the correct token to pay for transactions when assets are sent to a new chain. This feature uses Initia's network of interwoven rollups to automatically convert and bridge additional tokens into the new chain's custom gas token as part of the transaction flow. This ensures that users can execute transactions with "stranded" assets by converting them into the required gas token for the new chain, all within the same transaction process. Just-In-Time Gas significantly improves the user experience by removing the need for manual token swaps or bridging to meet gas requirements.

Both features, Custom Gas Fee and Just-In-Time Gas, are part of Initia's broader effort to reduce complexity and enhance the user experience across its ecosystem of interwoven rollups. By providing these functionalities, Initia aims to make interacting with its platform more accessible and efficient for both developers and users.
