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Synapse API — zkSync NFT Metadata Lookup
x402
Synapse API — zkSync 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 2026-10-14).
Fetches NFT metadata (name, image, attributes, etc.) for a given token ID and contract address on the zkSync 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 structured NFT metadata for the specified zkSync token, typically including token name, description, image URL, animation URL (if any), and a list of attributes/traits such as background, rarity tier, and other collection-specific properties.
Example use cases
Verify NFT traits before purchase
“Before I buy this NFT, can you fetch its metadata from contract 0xDEADBEEF00000000000000000000000000000001, token ID 88 on zkSync, so I can see its rarity attributes and image?”
Display NFT in gallery app
“I need to show the name, description, and image for token ID 5 from the zkSync NFT contract 0xABCDABCDABCDABCDABCDABCDABCDABCDABCDABCD — can you grab the full metadata?”
Audit collection attributes
“I'm building a rarity tool for a zkSync NFT collection. Can you retrieve the metadata for token ID 200 at contract address 0x1111222233334444555566667777888899990000 so I can check its traits?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/zksync/nft/metadata?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need NFT metadata from the zkSync or zkSync Era Layer-2 network. It is preferable over generic multi-chain NFT APIs when you know the asset lives on zkSync and want fast, pay-per-call access without a subscription. It's ideal for agents that need lightweight, on-demand token metadata lookups without maintaining their own blockchain node.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID not minted or out of range returns not-found error
- Contract is not an NFT contract (e.g., ERC-20) returns metadata parsing failure
- zkSync network congestion or RPC unavailability causes timeout
- Malformed input (wrong type for tokenId or contractAddress) causes validation error
- Metadata hosted off-chain (IPFS/HTTP) may be unavailable if the gateway is down
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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