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OP Mainnet NFT Metadata Lookup
x402
OP Mainnet NFT Metadata Lookup is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-29).
Fetches full metadata for an ERC-721 or ERC-1155 token on OP Mainnet, including collection name, owner, token URI, and decoded metadata 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 OP Mainnet: 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 (optimism), contract address, token ID, NFT standard (ERC-721 or ERC-1155), collection name, current owner address (for ERC-721), raw token URI, a browser-loadable imageUrl, and a fully decoded metadata object (name, description, image, attributes) resolved from IPFS, Arweave, HTTPS, or inline data URIs, along with the source it was fetched from.
Example use cases
NFT portfolio viewer for OP Mainnet
“I hold token ID 42 from contract 0xAbC123...on Optimism — can you fetch its name, image, and description so I can display it in my portfolio?”
Verify NFT ownership before trade
“Before I buy this Optimism NFT, can you confirm who currently owns token 7 from collection 0x4857DB576eE0e45F10525eC59527BfD10beeC60b and show me what the token actually looks like?”
Inspect DeFi position NFT details
“I have a Velodrome liquidity position NFT on Optimism — token ID 1043 at 0x4857DB576eE0e45F10525eC59527BfD10beeC60b — can you get me the full metadata including the pool details from the description?”
Technical details
Endpoint
GEThttps://onchaincheck.dev/optimism/nft?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need complete, decoded NFT metadata for a specific token on OP Mainnet (Optimism), including image resolution from IPFS, Arweave, or inline data URIs. Prefer this over generic blockchain RPC calls when you need a human-readable, browser-ready result without writing custom decoding logic. Use this instead of the Base or Polygon PoS equivalents when the NFT contract is deployed specifically on Optimism.
Side effects
- Invalid contract address format returns a validation error
- Token ID out of range or non-existent token returns a not-found error
- IPFS or Arweave gateway timeout if metadata is hosted on a slow or unavailable node
- Contract exists but does not implement ERC-721 or ERC-1155 returns a standard-detection error
- Token URI points to an unreachable or malformed metadata endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "optimism",
"owner": "0xc2EEdF3bC7F93366c00c6074DF0e6F122fa2445c",
"tokenId": "1043",
"contract": "0x4857DB576eE0e45F10525eC59527BfD10beeC60b",
"imageUrl": "data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDAwIiBoZWlnaHQ9IjQwMCIgdmlld0JveD0iMCAwIDQwMCA0MDAiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLz… (240 chars, truncated in this example)",
"metadata": {
"name": "CL - USDC/ETH - 2397.1<>2421.2",
"image": "data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDAwIiBoZWlnaHQ9IjQwMCIgdmlld0JveD0iMCAwIDQwMCA0MDAiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLz… (240 chars, truncated in this example)",
"description": "This NFT represents a liquidity position in a Velodrome Finance USDC-ETH pool. The owner of this NFT can modify or redeem the position.\n\nPool Address: 0xca231d91ec00385a54e541f504617d2197f9b7c3\nUSDC A… (240 chars, truncated in this example)"
},
"standard": "ERC-721",
"tokenUri": "data:application/json;base64,eyJuYW1lIjo…",
"collection": "Slipstream V3 Deposit",
"fetchedFrom": "inline data URI"
}
}Tags
x402
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