# Synapse API — opBNB NFT Metadata Lookup

> Synapse API — opBNB 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 2026-10-15).

Fetches NFT metadata for a given token ID and contract address on the opBNB blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/opbnb/nft/metadata?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-opbnb-nft-metadata-lookup-f1875629
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ao6iX2Mp4FFD2BBDfxdzQ

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-opbnb-nft-metadata-lookup-f1875629 -d '<json body>'
```

Example prompt: Can you pull up the metadata for opBNB NFT token ID 42 from contract address 0xAbC123...? I want to see the name, image, and traits.

## When to prefer this

Choose this endpoint when you specifically need NFT metadata from the opBNB network (BNB Chain Layer 2). It is ideal for agents enriching NFT portfolio data, powering marketplace listings, or verifying token attributes on opBNB without running your own node. Prefer this over general-purpose blockchain explorers when you need structured metadata in a single pay-per-call API call.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not minted yet returns a not-found or null metadata response
- Malformed tokenId or contractAddress input causes a validation error
- opBNB RPC node downtime may cause timeouts or service unavailability
- Off-chain metadata URI (IPFS/HTTP) unreachable results in missing or incomplete metadata

## 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 NFT metadata for the specified token on the opBNB network, typically including the token name, description, image URL, external URL, and an array of trait attributes (trait_type and value pairs), sourced from the token URI stored 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-opbnb-nft-metadata-lookup-f1875629/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)