RPC nodes serve as the gateway for dApps to interact with blockchain networks, offering data retrieval and transaction interactions.Ethereum, Solana, and Polygon are compared based on network performance, costs, and popular RPC service providers.Ethereum, known for its security and decentralization, processes around 15 transactions per second with higher transaction fees.Solana, with high throughput and low transaction costs, is optimal for speed-dependent applications like high-frequency trading.Polygon, faster and cheaper than Ethereum, is commonly used to scale Ethereum-based dApps, facilitating low-cost transactions.RPC Node Providers like GetBlock, Infura, Alchemy, and QuickNode offer API endpoints for Ethereum, Solana, and Polygon.GetBlock supports over 50 networks, while Infura is preferred for Ethereum and EVM-compatible chains.Alchemy offers upgraded APIs and features for multiple networks, and QuickNode excels in high-performance and multi-chain support.Choosing the right RPC provider depends on dApp requirements, such as reliability, speed, cost efficiency, and specific use cases.Having a multi-network strategy may involve using the same RPC provider for Ethereum, Polygon, and Solana to ensure infrastructure consistency.