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Kusama
Kusama (KSM) is a Substrate-based relay chain secured by nominated proof of stake, using BABE for block production and GRANDPA for deterministic finality, and serves as Polkadot’s canary network. Runtime logic is compiled to WebAssembly, while validators execute extrinsics and full nodes maintain account, staking, governance, runtime, and relay-chain state in Substrate storage. Because Kusama shares Substrate, BABE, GRANDPA, and relay-chain conventions with Polkadot, its state and transaction model maps closely to the broader Polkadot ecosystem.
Kusama API Methods and Endpoints
NOWNodes exposes Kusama's interface, plus a few others, depending on what your integration needs: JSON-RPC for reading chain state and broadcasting transactions, and WSS (WebSocket) for real-time subscriptions and events.
Browse the interfaces below for endpoint details, request parameters, response formats, and integration examples. Create an API key, select Mainnet or Testnet, choose the required interface, and start sending requests from your application.
Weighing Kusama RPC providers against each other? Read the comparison guide on our blog — this page stays focused on integration reference.
Quick start
Select environment
Mainnet or Sepolia testnet.
Choose an interface
RPC, WSS, Blockbook, or Trace/Debug.
Send a request
Call it from your application.
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