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Synapse API — Optimism NFT Metadata Lookup
x402
Synapse API — Optimism NFT Metadata Lookup is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Fetches on-chain NFT metadata for a given contract address and token ID on the Optimism blockchain network
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns the NFT token's on-chain metadata including name, description, image URL, animation URL, external URL, and attributes/traits array as stored or referenced by the Optimism smart contract.
Example use cases
NFT portfolio trait inspection
“I own token #42 from the contract 0x1234abcd...5678 on Optimism — can you pull its metadata so I can see what traits and rarity attributes it has?”
NFT marketplace listing enrichment
“I'm listing an NFT on a marketplace and need the full metadata for token ID 99 at contract address 0xdeadbeef...cafe on Optimism, including the image URL and description.”
NFT authenticity and details check
“Someone is trying to sell me token 7777 from contract 0xfeedface...0001 on Optimism — can you retrieve its on-chain metadata so I can verify what it actually is before I buy?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/optimism/nft/metadata?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need NFT metadata from the Optimism (OP Mainnet) Layer 2 blockchain. Prefer this over Ethereum mainnet NFT lookups when the NFT was minted on Optimism to avoid incorrect chain queries. Suitable for per-token lookups at $0.01 per call via x402 micropayment.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID does not exist on the contract returns a not-found error
- Contract is not an NFT contract (ERC-721/ERC-1155) may return malformed or no metadata
- Metadata hosted off-chain (e.g. IPFS timeout) may cause slow or failed retrieval
- Rate limit exceeded or payment failure returns a 402 or 429 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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