# Synapse API — Linea NFT Metadata Lookup

> Synapse API — Linea 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 Linea blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/linea/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-linea-nft-metadata-lookup-34948566
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hue9VDy8zZpNWSQP88Kib

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-linea-nft-metadata-lookup-34948566 -d '<json body>'
```

Example prompt: Can you look up the metadata for token ID 1234 from the NFT contract 0xAbCd1234...5678 on the Linea blockchain and tell me its name, image, and traits?

## When to prefer this

Use this endpoint when you specifically need NFT metadata on the Linea blockchain network and want a pay-per-call model without subscription overhead. Prefer this over generic NFT APIs when Linea network coverage is required, and over general-purpose blockchain explorers when you need structured, machine-readable metadata rather than a human-facing UI.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not found on the specified contract returns a not-found error
- Contract address is not an NFT contract (e.g., ERC-20) and has no token metadata
- Linea network RPC unavailability causes timeout or service error
- Malformed input (non-hex contract address or non-numeric token ID) returns a validation error
- Payment failure via x402 results in 402 response before data is returned

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

## 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-linea-nft-metadata-lookup-34948566/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)