IPFS fetch / IPFS gateway / Web3 storage retrieval / NFT metadata fetcher / Filecoin gateway / decentralized content / pinned-content reader. Resolves a CID (CIDv0 Qm... or CIDv1 bafy...) and optional sub-path through a fallback chain of public gateways (cloudflare-ipfs.com to ipfs.io to dweb.link) and returns the content as base64 / text / parsed JSON. Hard cap 5 MB. HEAD pre-flight + streaming size cap so oversized files are rejected before they're fully downloaded. No API key required.