# Synapse API — Unichain NFT Metadata Lookup

> Synapse API — Unichain 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 2026-09-15).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/unichain/nft/metadata
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-unichain-nft-metadata-lookup-24243e41
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gxRu6bYs2p5EvH6Sqkg7s

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-unichain-nft-metadata-lookup-24243e41 -d '<json body>'
```

Example prompt: Can you pull the metadata for token ID 42 from the NFT contract 0xAbC1234...5678 on Unichain — I want to see the name, image, and any traits.

## When to prefer this

Choose this endpoint when you specifically need NFT metadata from the Unichain network and want pay-per-call pricing without a subscription. It covers the full 57+ blockchain suite under Synapse API but this path is dedicated to Unichain NFTs, making it more targeted than a general multi-chain NFT metadata resolver.

## Known failure modes

- Invalid contract address format returns a validation error
- Token ID does not exist on the contract returns a not-found error
- Contract is not an NFT contract or does not implement metadata URI returns an empty or error response
- Unichain RPC node unavailable causes a timeout or 503 error
- Metadata URI points to an unreachable IPFS or HTTP resource, resulting in empty metadata fields

## 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 token, typically including the token name, description, image URL, external URL, and an array of attributes/traits as defined by the NFT contract's metadata standard (ERC-721/ERC-1155 compatible JSON).

## 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-unichain-nft-metadata-lookup-24243e41/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)