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Synapse API — NFT Metadata Lookup
x402
Synapse API — 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 2026-10-17).
Retrieves metadata for a specific NFT given its contract address and token ID across blockchain networks
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 structured NFT metadata including token name, description, image URI, external URL, and an array of trait attributes (trait_type, value pairs) as stored in or referenced by the smart contract.
Example use cases
NFT trait lookup for rarity analysis
“Fetch the metadata for token ID 8888 from the Azuki contract at 0xED5AF388653567Af2F388E6224dC7C4b3241C544 — I want to see all its attributes and rarity traits.”
NFT display info for marketplace listing
“I need the name, description, and image URL for token ID 42 from contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D so I can display it on our gallery page.”
Verify NFT authenticity and properties
“Can you look up the on-chain metadata for token ID 5001 at contract 0x49cF6f5d44E70224e2E23fDcdd2C053F30aDA28B to confirm what collection it belongs to and what its listed attributes are?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/abstract/nft/metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need rapid NFT metadata retrieval across a wide range of blockchains (57+) at a low per-call cost of $0.01 USDC via x402 micropayment. Ideal for agents that need on-demand NFT data without maintaining their own indexer or RPC infrastructure.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID not found or not yet minted returns a 404 or null metadata
- Metadata hosted on unreachable IPFS/arweave gateway causes timeout
- Contract is not an ERC-721/ERC-1155 standard and lacks a tokenURI function
- Network not supported among the 57+ chains returns an unsupported network error
- Payment not included or insufficient USDC causes 402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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