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    • Basic Rust
      • Introduction to Rust
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          • Components of a Pallet
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        • Bump Polkadot SDK versions
      • Cumulus
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  1. Building a blockchain with Polkadot SDK
  2. Polkadot SDK
  3. Substrate

Runtime API and RPC

PreviousCommon runtime modulesNextRuntime upgrade

Last updated 6 months ago

Substrate nodes consist of outer node services and a runtime and this separation of responsibilities is an important concept for designing Substrate-based chains and building upgradeable logic. However, the outer node services and the runtime must communicate with each other to complete many critical operations, including reading and writing data and performing state transitions. The outer node services communicate with the runtime by calling runtime application programming interfaces (Runtime API) to perform specific tasks.

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How Runtime and Outer Node Services communicate mutually?