rpc-nodes
RPC (Remote Procedure Call) nodes are servers that act as intermediaries, enabling communication between blockchain networks and external applications.
RPC (Remote Procedure Call) nodes are essential components in distributed systems, particularly in blockchain networks, that enable applications to interact with a blockchain without needing to run a full node themselves. An RPC node acts as an intermediary or gateway. When an external application (like a decentralized application or a wallet) needs to query blockchain data (e.g., account balances, transaction history) or submit a transaction, it sends an RPC request to the RPC node. The RPC node, which is connected to the blockchain network and often maintains a local copy of the blockchain state (though not necessarily the entire history like a full archival node), processes this request. It then communicates with the blockchain's underlying protocol, retrieves the necessary information or submits the transaction, and formats the response. This response is sent back to the requesting application via the RPC interface. RPC nodes abstract away the complexities of direct peer-to-peer communication within the blockchain network, providing a standardized API (often JSON-RPC) for developers. This simplifies development, allowing applications to focus on user experience rather than low-level network protocols. However, relying on third-party RPC nodes introduces potential trade-offs, including latency, censorship risk (if the provider filters requests), and reliance on the provider's infrastructure stability.
graph LR
Center["rpc-nodes"]:::main
Pre_computer_science["computer-science"]:::pre --> Center
click Pre_computer_science "/terms/computer-science"
Rel_api["api"]:::related -.-> Center
click Rel_api "/terms/api"
Rel_blockchain_interoperability["blockchain-interoperability"]:::related -.-> Center
click Rel_blockchain_interoperability "/terms/blockchain-interoperability"
Rel_bridges["bridges"]:::related -.-> Center
click Rel_bridges "/terms/bridges"
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🧒 Explain Like I'm 5
An [RPC node](/en/terms/rpc-node) is like a helpful librarian for a giant book (the [blockchain](/en/terms/blockchain)). You ask the librarian a question (like 'how many pages are in this chapter?'), and they go find the answer in the book and tell you, so you don't have to read the whole book yourself.
🤓 Expert Deep Dive
RPC nodes expose an API, typically JSON-RPC over HTTP/S or WebSockets, allowing clients to invoke methods on the blockchain network. Common RPC endpoints include eth_getBalance, eth_sendRawTransaction, eth_getBlockByNumber, etc. The node's configuration determines its capabilities; some nodes offer archival access (full history), while others provide pruned or light state access. Running one's own RPC node offers maximum control, privacy, and censorship resistance but incurs significant hardware and bandwidth costs. Utilizing third-party RPC providers (e.g., Infura, Alchemy) offers convenience and scalability but introduces trust assumptions and potential points of failure or censorship. Security considerations include rate limiting, authentication, and protection against denial-of-service (DoS) attacks. Advanced use cases involve subscribing to real-time event streams (e.g., using WebSockets) for dApp frontends. The choice between different RPC providers or self-hosting involves a trade-off between cost, performance, reliability, and decentralization.