{"name":"Fabler Labs Base ERC-721 Owner Lookup","description":"Machine-payable current owner lookup for one ERC-721 token on Base. Pay with HTTP 402 + USDC on Base.","x402Version":2,"operator":"https://fablerlabs.com","network":"eip155:8453","payTo":"0x65E3E64935eA709bDf1119E1fC991299c04c0154","resources":[{"type":"http","resource":"https://nft.fablerlabs.com/nft/owner","x402Version":2,"method":"GET","accepts":[{"scheme":"exact","network":"eip155:8453","amount":"3000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x65E3E64935eA709bDf1119E1fC991299c04c0154","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}}],"lastUpdated":"2026-09-07T14:42:04.717Z","metadata":{"description":"Look up the current owner of one ERC-721 token on Base with ownerOf(uint256). Accepts a strict contract address and uint256 decimal token ID, performs one read-only eth_call with bounded public-RPC fallback, and returns the normalized owner address. Reverts, non-contracts, nonexistent tokens, malformed responses, and upstream failures return non-2xx and do not settle.","mimeType":"application/json"}}]}