# Implementation Highlights

**Optimistic Rollup Using OP Stack**: X employs an Optimistic Rollup solution built on the OP Stack to enhance transaction throughput and reduce costs while maintaining security.

* **Mechanism**: Transactions are processed off-chain, assuming they are valid by default. Periodic proofs are submitted to the Ethereum mainnet to ensure the integrity and validity of transactions.
* **Benefits**: This approach significantly increases transaction speeds and reduces costs, making financial services more accessible and efficient.

**Custom Gas Token (xUSD) Implementation**: xUSD, a USD-pegged stablecoin, is used as the native gas token within the Layer 2 network.

* **Purpose**: Using xUSD for transaction fees simplifies the user experience by eliminating the need for multiple cryptocurrencies and providing a stable and predictable cost structure.
* **Integration**: xUSD is directly integrated into the modified Ethereum Virtual Machine (EVM) within the OP Stack, ensuring seamless transactions and consistent gas pricing.