RPC nodes serve as the API layer for blockchain networks, translating complex peer-to-peer protocols into developer-friendly HTTP/WebSocket endpoints. They enable applications to read blockchain state (balances, contract data) and submit signed transactions through JSON-RPC methods without handling low-level networking. Developers can access RPC nodes by running their own infrastructure, using free public endpoints with rate limits, or subscribing to managed providers like Alchemy and QuickNode for scalable production use.
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