In the current flourishing development of Rollup technology, a major challenge users face is the complexity of the fee system. Each Rollup chain requires different Tokens, and cross-chain operations are even more cumbersome. To address this pain point, Caldera has proposed an innovative solution: a unified fee layer (ERA).

The core concept of ERA is to use a single Token $ERA to unify the settlement of transaction fees throughout the Rollup ecosystem. Whether it is for cross-chain, asset bridging, or sending transactions, users only need to use $ERA to complete all operations, greatly simplifying the process.

This model can be likened to a universal payment card in a shopping mall. Users no longer need to prepare different Tokens for each store, but can use a universal currency to navigate the entire ecosystem. This not only simplifies user operations but also improves interaction speed and the efficiency of fund usage.

The benefits brought by ERA are obvious for developers and users: it eliminates the cumbersome process of switching coins, greatly improves user experience, and enhances the efficiency of fund utilization.

Caldera's vision does not stop here. It is committed to building the "Internet of Rollups"—an infrastructure platform with high modularity, customizability, and interoperability. The unified fee layer is just the first step in this grand blueprint, and it is expected to support more blockchains and application scenarios in the future.

In this system, $ERA is not just a simple Token, but a true "fuel" with real utility, providing power for the operation of the entire ecosystem.

The emergence of Caldera makes the user experience of Rollup closer to the mobile payment systems we are familiar with, rather than complex on-chain operations. As the ecosystem continues to expand, this simplified and unified payment model will become increasingly important and is worth continuous attention from industry professionals.