# Synapse API — Gnosis NFT Metadata Lookup

> Synapse API — Gnosis 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 2026-09-14).

Fetches on-chain NFT metadata for a given contract address and token ID on the Gnosis blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/gnosis/nft/metadata
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-gnosis-nft-metadata-lookup-dcf1136a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0lxgaL8bqN64mb84WSUwf

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synapse-api-gnosis-nft-metadata-lookup-dcf1136a -d '<json body>'
```

Example prompt: Can you pull the metadata for token ID 42 from the NFT contract 0xabc123... on the Gnosis chain — I want to see its name, image, and attributes?

## When to prefer this

Choose this endpoint when you specifically need NFT metadata from the Gnosis (xDAI) blockchain network. It is purpose-built for Gnosis and handles Gnosis-specific RPC and indexing. Prefer it over generic multi-chain explorers when you need fast, pay-per-call access without API key registration, or when building agents that operate across the 57+ chains supported by the Synapse API suite including Gnosis.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not found within the contract returns a not-found error
- Contract is not an NFT (ERC-721/ERC-1155) contract, causing a metadata resolution failure
- Gnosis RPC node unavailability leads to timeout
- Metadata URI is off-chain and unreachable (e.g., IPFS gateway down), resulting in incomplete metadata
- Malformed contractAddress or tokenId input causes a 400-level validation error

## 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 the on-chain metadata for the specified NFT on Gnosis, typically including the token name, description, image URL, external URL, and an array of trait/attribute key-value pairs as stored in the token's metadata URI.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tokenId": {
   "type": "string"
  },
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-gnosis-nft-metadata-lookup-dcf1136a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)