Use when you need the exact published artifact for an npm version: dependencies, optionalDependencies, peerDependencies, bundledDependencies, engines, os/cpu, dist (tarball URL, integrity, shasum, unpacked size), and the version publish time. Give "latest" as version to resolve the current dist-tag. Paid tool: x402 USDC on Base, $0.002 per successful call; call without payment to receive the PaymentRequired object.