viem is a TypeScript interface for Ethereum and EVM-based networks. It gives developers typed primitives for RPC calls, contract reads and writes, wallet actions, transaction formatting, ABI encoding, and EIP-712 typed data.

Use it for:

• Building DApp frontends and backend services.
• Reading blockchain state through an RPC provider.
• Writing contract interactions with strong TypeScript inference.
• Creating bots, scripts, indexers, and developer libraries.

Best fit: teams that want direct Ethereum RPC and smart contract control without a heavy application framework.