# Synapse API — BNB Chain NFT Metadata Lookup

> Synapse API — BNB Chain 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 (name, description, image, attributes) for a given token ID and contract address on the BNB Smart Chain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/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-bnb-chain-nft-metadata-lookup-fd4a4a28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AGOAxIHirb5V_XSOpTGEk

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-bnb-chain-nft-metadata-lookup-fd4a4a28 -d '<json body>'
```

Example prompt: Can you pull up the metadata for token ID 1042 from the NFT contract 0xABC123... on BNB Smart Chain — I want to see its name, image, and any traits it has.

## When to prefer this

Choose this endpoint when you specifically need NFT metadata from the BNB Smart Chain (BSC) network and want a pay-per-call, no-subscription approach via x402. It is ideal for agents that need to enrich NFT data on demand without maintaining their own BNB node or indexer.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID does not exist on the contract, resulting in a not-found or revert error
- Contract is not an NFT (ERC-721/BEP-721) standard, causing metadata fetch failure
- Token URI points to an unreachable or offline metadata server
- Payment not received or insufficient USDC balance causes 402 rejection
- Rate limiting or network congestion on BNB chain may delay or fail the response

## 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 BNB Smart Chain, typically including the token name, description, image URL, external URL, and a list of trait/attribute key-value pairs as stored in the token URI or on-chain metadata.

## 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-bnb-chain-nft-metadata-lookup-fd4a4a28/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)