An RPC endpoint is the network interface a client uses to send Remote Procedure Call requests to a blockchain node. Through it, software can query balances, read blocks, submit transactions, inspect smart contracts, or watch chain state. In practice, it is the “front door” for automated access to the ledger.
RPC endpoints matter in cyber security because they expose the operational layer attackers and defenders both depend on. Malware can use them to read on-chain command data, check whether a transaction has been confirmed, or interact with contracts that carry tasking. Defenders may monitor RPC traffic for unusual chain access, block suspicious outbound requests, and protect public endpoints from abuse, scraping, or rate-driven denial of service. When a botnet shifts coordination onto a blockchain, the RPC endpoint often becomes the key observable signal on infected hosts.