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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 2026-10-16).
Fetches on-chain NFT metadata for a given contract address and token ID across 57+ 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 URL, external URL, animation URL, and an array of trait attributes (trait_type and value pairs) as stored on-chain or on the token's metadata URI for the specified contract and token ID.
Example use cases
Verify NFT traits before purchase
“Before I buy this NFT, can you pull the metadata for token ID 7804 on contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D so I can check its traits and rarity attributes?”
Display NFT details in a portfolio app
“Show me the full metadata for token ID 1001 at contract address 0x60E4d786628Fea6478F785A6d7e704777c86a7c6 — I need the name, image URL, and all attributes to display in my gallery.”
Audit NFT collection properties
“I'm building a report on this NFT project — can you fetch the metadata for token ID 500 from contract 0x8a90CAb2b38dba80c64b7734e58Ee1dB38B8992e so I can record its on-chain properties?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/bob/nft/metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically retrieve NFT token metadata (name, image, attributes) given a specific contract address and token ID, especially across a broad range of EVM-compatible and non-EVM blockchains. Prefer it over general blockchain explorers when you want structured JSON metadata optimized for agent consumption, and when pay-per-call pricing ($0.01 USDC) via x402 is suitable for your use case.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID does not exist on the given contract — returns not found or null metadata
- Contract address is not an NFT contract (e.g. ERC-20) — returns schema mismatch error
- Network/chain not supported among the 57+ supported networks — returns unsupported chain error
- Metadata URI is off-chain and unreachable (IPFS gateway timeout, dead URL) — returns fetch failure
- Malformed input (missing contractAddress or tokenId) — returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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