Query a block by number through a JSON-RPC endpoint and inspect its basic fields.

Retrieve a transaction receipt and inspect status, gas usage, logs, and block placement.

Perform basic client-side validation before presenting a blockchain address to a user.

Call a read-only smart-contract method through an RPC provider.

Demonstrate integer-safe token amount handling and decimal conversion without floating-point assumptions.

Detect the connected chain ID before sending a transaction or directing a user to a Layer-2 network.

Try multiple RPC endpoints in sequence when the primary endpoint is unavailable.

Model a typed cross-chain message envelope for application-level validation.

Calculate a simple transaction budget when a network uses a predictable fixed transaction cost.

Represent an allowlisted transaction policy for an autonomous software agent.