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Synapse API — Base NFT Metadata Lookup
x402
Synapse API — Base 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 2026-10-12).
Fetches on-chain NFT metadata for a given contract address and token ID on the Base 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 NFT metadata for the specified token on the Base blockchain, typically including the token name, description, image URL, external URL, and an attributes/traits array with trait types and values as defined in the token's on-chain or IPFS-linked metadata.
Example use cases
Display NFT artwork details
“What are the traits and image URL for token ID 88 on the Base contract 0xd4307e0acd12cf46fd6cf93bc264f5d5d1598792? I want to display its metadata on our gallery page.”
Verify NFT rarity attributes
“Look up the on-chain metadata for token ID 512 on contract 0x5180db8F5c931aaE63c74266b211F580155ecac8 on Base — I need to check its rarity attributes before listing it for sale.”
Enrich NFT portfolio listing
“For each of my Base NFTs, starting with contract 0xabc123 token ID 7, fetch the metadata so I can show the name, description, and image in my portfolio dashboard.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/base/nft/metadata?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to retrieve NFT metadata specifically on the Base blockchain by contract address and token ID. Prefer it over generic blockchain explorers when you need structured, agent-consumable metadata output with low latency. Best when building NFT display UIs, portfolio enrichment tools, or rarity analyzers targeting Base chain assets.
Side effects
- Invalid contract address format returns an error or empty response
- Token ID does not exist on the contract, resulting in a not-found or revert error
- Contract is not a valid ERC-721 or ERC-1155 NFT contract
- Metadata stored on IPFS or external URI is unreachable or timed out
- Base network RPC node downtime causes lookup failures
- Malformed JSON in the token's metadata URI returns a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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