Sepolia ETH is a test of the Sepolia currency network, the primary test of the Ethereum environment. It has no real value and is used by developers to debug smart contracts and dApps before the mainnet launch. Working with the testnet requires reliable access to its data. Instead of running your own node, use ready-made infrastructure solutions. I recommend Getblock, which provides quick API access to sepolia eth and other premises. This complex modification focuses on product development, not support.