Constants

Runtime constants (parameter types) are defined in metadata, and can be inspected via client.consts entry point with format: client.consts.<pallet>.<constantName>

All available constants are also exposed in the ChainApi interface. E.g: Available constants for Polkadot network is defined here, similarly for other networks.

// Get runtime version
const runtimeVersion = client.consts.system.version;

// Get existential deposit in pallet balances
const existentialDeposit = client.consts.balances.existentialDeposit;