# Synapse API — opBNB NFT Sales

> Synapse API — opBNB NFT Sales 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 2026-09-15).

Retrieves NFT sales transaction data from the opBNB blockchain, filterable by contract address and block range.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/opbnb/nft/sales
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-opbnb-nft-sales-5daea92a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3ikYh5k3PiKbCoM4iuPpD

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-sales-5daea92a -d '<json body>'
```

Example prompt: Pull the last 50 NFT sales for contract 0xAbC123... on opBNB, ordered from newest to oldest, covering blocks 1000000 to 1050000.

## When to prefer this

Use this endpoint when you specifically need NFT sales data from the opBNB (BNB Chain Layer 2) network. Prefer it over generic blockchain explorers when you need programmatic, filtered access by contract address and block range, and when pay-per-call pricing at $0.01 USDC is acceptable for on-demand queries.

## Known failure modes

- Invalid contract address format returns an error or empty result
- fromBlock greater than toBlock yields no results or validation error
- Limit value too large may cause timeout or truncated response
- opBNB node unavailability causes upstream errors
- Block range spanning too many blocks may hit rate or data limits

## 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 a list of NFT sales events from the opBNB blockchain, including transaction details such as sale price, buyer/seller addresses, token IDs, and block numbers, filtered to the specified contract address and block range and paginated by the given limit.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "number"
  },
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "toBlock": {
   "type": "number"
  },
  "fromBlock": {
   "type": "number"
  },
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-opbnb-nft-sales-5daea92a/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)