# Synapse API — opBNB NFT Floor Price

> Synapse API — opBNB NFT Floor Price 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 2026-10-16).

Returns the current floor price for an NFT collection on the opBNB blockchain given a contract address

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/opbnb/nft/floor-price?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-opbnb-nft-floor-price-77734c5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W8TpWHyWv29QRIrvcY8gA

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-floor-price-77734c5d -d '<json body>'
```

Example prompt: What's the current floor price for the NFT collection at contract address 0xABC123... on opBNB?

## When to prefer this

Choose this endpoint when you specifically need NFT floor price data on the opBNB blockchain (BNB Chain's Layer 2). It is priced at $0.01 USDC per call via x402, making it cost-effective for spot checks. Prefer this over generic NFT APIs when opBNB-specific data is required, as general NFT APIs may not index opBNB collections.

## Known failure modes

- Invalid or malformed contract address returns an error
- Contract address not found on opBNB network returns a not-found or null response
- No active listings for the collection may result in null or zero floor price
- Network congestion or RPC failures may cause timeouts
- Vercel cold start may add latency on first call

## 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 current floor price for the specified NFT collection on the opBNB network, typically including the lowest listed price in native token denomination and possibly USD equivalent, sourced from on-chain or marketplace data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-opbnb-nft-floor-price-77734c5d/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)