# Synapse API — Sonic NFT Metadata Lookup

> Synapse API — Sonic 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).

Retrieves NFT metadata for a given token ID and contract address on the Sonic blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sonic/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-sonic-nft-metadata-lookup-f13220d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mKmACw-DZuUtvuQmTX-I7

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-sonic-nft-metadata-lookup-f13220d3 -d '<json body>'
```

Example prompt: Can you pull the metadata for token ID 1234 at contract address 0xAbC123... on the Sonic blockchain — I want to see its name, image, and traits?

## When to prefer this

Use this endpoint when you specifically need NFT metadata from the Sonic blockchain network and want a simple pay-per-call API without managing your own RPC nodes. Prefer this over general-purpose blockchain RPC calls when you want a clean abstraction that returns structured NFT metadata directly.

## 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
- Sonic network connectivity issues may cause timeouts
- Malformed input (non-string tokenId or contractAddress) may cause validation errors
- Contract does not implement standard metadata URI may return incomplete data

## 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 token on the Sonic network, typically including token name, description, image URL, and attribute/trait arrays as defined by the NFT contract'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-sonic-nft-metadata-lookup-f13220d3/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)