# Synapse API — Mantle NFT Metadata Lookup

> Synapse API — Mantle 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 2026-10-17).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/mantle/nft/metadata?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-mantle-nft-metadata-lookup-eb827f51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KwIsS6YyYmCxxLSgwpiyr

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-mantle-nft-metadata-lookup-eb827f51 -d '<json body>'
```

Example prompt: Can you pull up the metadata for token ID 42 from the Mantle NFT contract at address 0xAbCd1234...5678? I want to see its name, attributes, and image.

## When to prefer this

Use this endpoint when you specifically need NFT metadata from the Mantle blockchain network and you have both the contract address and token ID available. Prefer this over generic multi-chain NFT APIs when Mantle-native data accuracy and low cost per call matter. Ideal for agents building NFT dashboards, marketplaces, or portfolio trackers targeting the Mantle ecosystem.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not found or out of range for the contract returns a not-found error
- Contract is not an NFT contract (ERC-721/ERC-1155) causing metadata fetch to fail
- Mantle network connectivity issues causing timeout
- Malformed contractAddress or tokenId input causes validation error
- Metadata stored off-chain (IPFS/HTTP) may be unavailable if the URI is broken

## 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 on the Mantle network, typically including the token name, description, image URI, external URL, and an array of trait/attribute key-value pairs as stored or referenced on-chain.

## 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-mantle-nft-metadata-lookup-eb827f51/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)