In today's rapidly developing blockchain technology, the parallel development of multiple Rollups has become a trend. However, this development model has also brought a significant issue: the inconsistency of transaction fees. This not only increases the difficulty of operations for users but also poses challenges for developers.

To address this issue, Caldera has proposed an innovative solution: the ERA (Unified Fee Layer) mechanism. The core of this mechanism is to achieve fee integration and payment standardization across a multi-chain ecosystem through a single token $ERA.

The design concept of the ERA mechanism is very intuitive: users only need to hold $ERA to complete various operations in all supported Rollups, including asset bridging, cross-chain interactions, and smart contract calls. This means that users no longer need to prepare different native Gas tokens for each chain, greatly simplifying the operational process and improving efficiency.

From the perspective of user experience, the ERA mechanism acts like introducing a "unified payment interface" in a complex, multi-layered blockchain ecosystem. It's akin to using a universal payment card in a large shopping mall, eliminating the need to repeatedly exchange currency in different areas, thus achieving seamless operation and smooth capital flow.

The practical application effects of the ERA mechanism have begun to emerge. It significantly reduces the number of token types that users need to hold, lowers the costs of switching assets between different chains, and improves the efficiency of fund utilization and liquidity utilization. This mechanism not only benefits ordinary users but also has important significance for DApp developers, providing them with a more efficient and coherent on-chain interaction experience.

It is worth noting that Caldera's goals are not limited to optimizing the fee structure. In the long run, Caldera is committed to building an 'Internet of Rollups', a grand vision that demonstrates its foresight in the development of blockchain technology.

The introduction of the ERA mechanism is undoubtedly an important step towards this goal. It not only addresses the pain points in the current multi-chain ecosystem but also paves the way for broader and deeper blockchain applications in the future. With the further improvement and promotion of this mechanism, we have reason to expect to see more innovative blockchain applications emerge, driving the entire industry forward.