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Synapse API — Arbitrum NFT Metadata Lookup
x402
Synapse API — Arbitrum 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 2026-10-18).
Fetches on-chain NFT metadata for a given contract address and token ID on the Arbitrum 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 on-chain NFT metadata for the specified token, typically including the token name, description, image URL, and an array of trait attributes as defined by the NFT contract on Arbitrum.
Example use cases
NFT portfolio trait inspection
“I own token ID 42 from the Arbitrum contract 0x1a2b3c4d5e6f... — can you fetch its metadata so I can see what traits and rarity attributes it has?”
NFT marketplace listing enrichment
“Before I list this NFT on a marketplace, can you grab the full metadata for token ID 99 at Arbitrum contract 0xDEAD...BEEF so I can display the correct name, image, and description?”
NFT authenticity and detail verification
“Someone sent me an Arbitrum NFT — token ID 7 from contract 0xF00...BA4 — can you fetch its on-chain metadata so I can verify what it actually is and see its official attributes?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/arbitrum/nft/metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need NFT metadata from the Arbitrum Layer-2 network and want a pay-per-call model without a subscription. Prefer this over general blockchain explorers when you need structured metadata output suitable for agent pipelines, or when your use case spans multiple NFT contracts programmatically on Arbitrum.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID not minted or out of range returns a not-found error
- Contract does not implement standard ERC-721/ERC-1155 metadata may return incomplete data
- Network congestion or RPC issues may cause timeout
- Payment failure via x402 protocol blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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