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Base NFT Token Metadata Lookup
x402
Base NFT Token Metadata Lookup is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-30).
Fetches on-chain and off-chain metadata for an ERC-721 or ERC-1155 token on Base, including collection name, owner, token URI, and decoded metadata JSON with a browser-loadable image URL.
Price / call$0.008
Success—
StatusUnknown
How this service works
Metadata for an ERC-721 or ERC-1155 token on Base: collection name, current owner (ERC-721), token URI, and the metadata JSON fetched and decoded from IPFS, Arweave, HTTPS or an inline data URI, with a browser-loadable image URL.
Output
Returns a JSON object with the chain ('base'), token standard (ERC-721 or ERC-1155), contract address, token ID, collection name, owner address (for ERC-721), token URI, a browser-loadable image URL, the source URL the metadata was fetched from, and the full decoded metadata JSON (name, image, description, attributes, and any custom fields) resolved from IPFS, Arweave, HTTPS, or inline data URIs.
Example use cases
Basename ENS profile card lookup
“Pull up the full metadata for the Basename token with contract 0x03c4738Ee98aE44591e1A4A4F3CaB6641d95DD9a and token ID 20339294690710288616623341905746354430592698944139542544116293784975432873833 on Base — I need the owner address, name, description, and image URL.”
NFT ownership verification before trade
“Before I buy this NFT, can you confirm who currently owns token ID 1042 in the Base contract 0xd4307e0acd12cf46fd6cf93bc264f5d5d1598792 and what the token image and collection name are?”
Display NFT gallery card details
“I'm building a gallery page — fetch the metadata for token 7 from the Base ERC-1155 contract 0xA449B4F43D9a33fCDc65d75C8B3a7E3b4E7A1234, including the image URL, name, and any description in the metadata JSON.”
Technical details
Endpoint
GEThttps://onchaincheck.dev/base/nft?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need complete, decoded NFT metadata for a specific token on the Base blockchain — including resolving off-chain storage like IPFS or Arweave into ready-to-display image URLs — without having to write your own IPFS gateway or ABI decoding logic. Prefer it over generic RPC calls when you need the full metadata JSON and a usable image URL in one call. It is specifically scoped to Base and handles both ERC-721 and ERC-1155 standards.
Side effects
- Invalid contract address format (must be 0x-prefixed 40 hex chars) returns a 400 error
- Token ID not matching pattern (non-numeric or too long) returns a 400 validation error
- Contract does not exist on Base or is not an ERC-721/ERC-1155 returns an error or empty response
- Token URI points to an unreachable IPFS/Arweave gateway causing metadata fetch failure
- Token ID does not exist in the collection (unminted) may return null metadata fields
- Payment not sent or invalid x402 payment header returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"owner": "0x2211d1D0020DAEA8039E46Cf1367962070d77DA9",
"tokenId": "20339294690710288616623341905746354430592698944139542544116293784975432873833",
"contract": "0x03c4738Ee98aE44591e1A4A4F3CaB6641d95DD9a",
"imageUrl": "https://www.base.org/api/basenames/jesse.base.eth/assets/cardImage.svg",
"metadata": {
"name": "jesse.base.eth",
"image": "https://www.base.org/api/basenames/jesse.base.eth/assets/cardImage.svg",
"description": "jesse.base.eth, a Basename",
"nameExpires": 2510960049,
"external_url": "https://www.base.org/name/jesse"
},
"standard": "ERC-721",
"tokenUri": "https://base.org/api/basenames/metadata/20339294690710288616623341905746354430592698944139542544116293784975432873833",
"collection": "Basenames",
"fetchedFrom": "https://base.org/api/basenames/metadata/20339294690710288616623341905746354430592698944139542544116293784975432873833"
}
}Tags
x402
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