Use when you need the public npm registry card for a package (scoped or unscoped): returns description, homepage, bugs URL, repository, license, keywords, maintainers as names only (emails stripped), number of versions, latest dist-tag version, created/modified times, and last-week download count from the official downloads API. Private packages are not supported. Paid tool: x402 USDC on Base, $0.002 per successful call; call without payment to receive the PaymentRequired object.