July 23, 2026 · 5 min read
Cosmos RPC Explained: Tendermint RPC vs REST vs gRPC
On Ethereum, 'the RPC' is one JSON-RPC endpoint. On Cosmos chains, 'RPC' can mean three different interfaces — Tendermint/CometBFT RPC, REST (LCD), and gRPC — each on its own port, each for a different job. Here's what each one does, when to use it, and the mental shift from calling contracts to querying modules.
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