The text discusses the challenges and innovations associated with deploying complex DeFi applications on the Ethereum network, emphasizing the rising costs for developers and users due to increased gas fees and network limitations under the PoW consensus algorithm. The text highlights Layer 2 solutions like xDAIChain, which use a sidechain mechanism to offer faster transaction times and lower fees, thereby enhancing user experience. It also details the deployment of smart contracts on xDAIChain using Chainlink oracles to provide high-quality external data. The implementation involves demonstrating the integration of Chainlink's price feed mechanism on xDAIChain, although the integration is not fully public. Furthermore, the text describes the process of setting up wallets and acquiring test tokens on the POA Sokol network, another sidechain implementation, along with providing a step-by-step guide on deploying and interacting with smart contracts using the Truffle framework. It warns about potential phishing scams and provides links to resources for developers interested in Chainlink's price reference data.