# Synapse API — NFT Floor Price Lookup

> Synapse API — NFT Floor Price 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 2026-10-13).

Retrieves the current floor price for an NFT collection given its contract address, across blockchain networks.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/abstract/nft/floor-price?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-nft-floor-price-lookup-ec2f0ab3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bUuWo6pz-Ab4geCl93y_N

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-nft-floor-price-lookup-ec2f0ab3 -d '<json body>'
```

Example prompt: What's the current floor price for the NFT collection at contract address 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call lookup of an NFT collection's floor price by contract address without committing to a subscription. Ideal for agents that need real-time or near-real-time floor price data across multiple blockchain networks. Prefer this over general NFT marketplace APIs when cost-per-call pricing and multi-chain support are priorities.

## Known failure modes

- Invalid or malformed contract address returns an error or empty result
- Contract address for a non-NFT contract returns no floor price data
- Collection with no active listings may return null or zero floor price
- Rate limiting or payment failure may result in 402 or 429 errors
- Unsupported blockchain network may return an error

## 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 of the NFT collection associated with the given contract address, typically expressed in the native currency of the relevant blockchain (e.g., ETH, SOL, MATIC). May include additional metadata such as currency denomination and collection identifiers.

## 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-nft-floor-price-lookup-ec2f0ab3/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)