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Base NFT Metadata URI Lookup
x402
Base NFT Metadata URI Lookup is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-11).
Returns the tokenURI (IPFS, HTTP, or data URI) for a given ERC721 token on Base mainnet, providing the on-chain metadata pointer without fetching the document itself.
Price / call$0.008
Success—
StatusUnknown
How this service works
NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.
Output
Returns the raw tokenURI string as stored on-chain for the specified ERC721 token — this may be an IPFS URI (ipfs://...), an HTTP/HTTPS URL, or a base64-encoded data URI. The endpoint does NOT fetch or decode the document at that URI; it only returns the pointer itself.
Example use cases
Verify NFT metadata source before purchase
“Before I buy token ID 88 from the contract 0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d on Base, can you tell me where its metadata is stored — is it IPFS, a centralized server, or an on-chain data URI?”
Build NFT gallery with metadata links
“I'm building a gallery and need the tokenURI for token IDs on Base — can you grab the on-chain metadata pointer for token 0 of the contract 0xa0cf798816d4b9b9866b5330eea46a18382f251e?”
Debug NFT display issue
“My NFT isn't showing up correctly — can you check what tokenURI is actually stored on-chain for token ID 5 of contract 0x7d8820fa92eb1584636f4f5b8515b5476b75171a on Base mainnet so I can see if the pointer is broken?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/nft-metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the raw on-chain tokenURI pointer for an ERC721 NFT on Base mainnet — for example, to verify where metadata is hosted (IPFS vs centralized), to build indexers, or to check if a URI is still valid before fetching. Prefer this over off-chain NFT APIs when you need the ground-truth on-chain value rather than a cached or enriched version. If you need the actual metadata document contents (name, image, traits), you'll need to follow up by fetching the returned URI separately.
Side effects
- Contract address does not exist on Base mainnet — call reverts or returns empty
- Token ID does not exist or has not been minted — tokenURI call reverts
- Contract is not ERC721 or does not implement tokenURI — returns error or empty string
- Malformed contract address input — validation error
- Network congestion or RPC timeout — slow or failed response
- Token has been burned — tokenURI may revert
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | |
| token_id | integer |
Tags
x402
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