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Synapse API — Polygon NFT Metadata Lookup
x402
Synapse API — Polygon 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 2026-10-19).
Fetches on-chain NFT metadata for a given contract address and token ID on the Polygon 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 NFT metadata for the specified Polygon token, typically including the token name, description, image URL, and an array of attributes/traits as defined by the NFT contract's metadata standard (ERC-721 or ERC-1155).
Example use cases
NFT trait verification for marketplace listing
“I'm listing an NFT on OpenSea — can you fetch the metadata for token ID 1337 on the Polygon contract 0xABCD1234... so I can confirm the traits and image look correct before I publish?”
NFT portfolio display in a wallet app
“Pull the metadata for Polygon NFT token ID 88 from contract 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D so I can show the image and attributes in my portfolio view.”
Rarity and attribute analysis for a collector
“What are the traits and attributes for token ID 500 on the Polygon contract 0x3a3048Af575d73B3A56Bb7Ba96a992B5e4F1dAb1? I'm trying to compare its rarity against other tokens in the collection.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/polygon/nft/metadata?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to retrieve NFT metadata specifically on the Polygon (MATIC) network by contract address and token ID. It is pay-per-call via x402, making it suitable for on-demand agent-driven lookups without a subscription. Prefer this over general blockchain explorers when you need structured metadata output in an agent-callable API format. If you need metadata on other chains (Ethereum, Solana, etc.), look for sibling endpoints in the same Synapse API suite.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Token ID not found within the contract returns a not-found or null metadata response
- Contract does not implement standard metadata URI returns incomplete or missing data
- Polygon RPC node downtime causes lookup failure
- Malformed contractAddress or tokenId input triggers a validation error
- Payment failure via x402 prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | |
| contractAddress | string |
Tags
x402
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