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Synapse API — Ethereum NFT Metadata Lookup
x402
Synapse API — Ethereum 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 2026-09-13).
Fetches on-chain and off-chain metadata for a specific Ethereum NFT given its contract address and token ID
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 metadata for the specified Ethereum NFT including its name, description, image URL, external URL, animation URL (if any), and an array of trait attributes (trait_type and value pairs), along with token standard and collection-level details where available.
Example use cases
Check NFT traits before purchase
“Before I buy this NFT, can you look up the metadata for token ID 5678 on contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D and tell me what traits and rarity attributes it has?”
Display NFT gallery details
“I'm building a gallery view — fetch the name, image URL, and description for Ethereum NFT contract 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB token ID 42 so I can display it.”
Verify NFT ownership metadata
“Can you retrieve the full metadata for token ID 9999 from the Azuki contract at 0xED5AF388653567Af2F388E6224dC7C4b3241C544 so I can verify the asset details match what the seller described?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/ethereum/nft/metadataWhen to prefer
Choose this endpoint when you need quick, pay-per-call NFT metadata resolution on Ethereum without a long-term API subscription. Ideal for agents that occasionally need to resolve NFT metadata on-demand rather than in bulk, and when you want to avoid rate limits or API key management overhead. Prefer over general-purpose blockchain explorers when you need structured, normalized metadata output rather than raw contract data.
Side effects
- Invalid or non-checksummed contract address returns an error
- Token ID does not exist on the contract (returns 404 or empty metadata)
- NFT metadata hosted on a down or rate-limited IPFS/HTTP server may return incomplete data
- Contract address is not an NFT contract (ERC-721/ERC-1155) — may return null or error
- Payment failure via x402 protocol returns 402 before the request is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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