# 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).

Returns the current floor price for an NFT collection given its contract address

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bob/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-a60d7841
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hqT17FjnOdfar0G2gXGCZ

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-a60d7841 -d '<json body>'
```

Example prompt: What's the current floor price for the NFT collection at contract address 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13B?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call floor price lookup for a specific NFT collection contract address without committing to a subscription. Ideal for agents that need real-time or near-real-time NFT pricing data in an automated workflow, especially when multi-chain support across 57+ networks is needed and cost-per-query pricing is preferable over a flat subscription tier.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty result
- Contract address is valid but not an NFT contract — may return null or error
- Network unavailable or upstream NFT data provider down — service error
- Collection has no active listings — floor price may be null or zero
- Rate limiting or payment failure via x402 — 402 Payment Required 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 the floor price of the specified NFT collection, typically including the price value and the currency denomination (e.g. ETH or native chain token), representing the lowest listed price for any NFT in that collection at the time of the query.

## 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-a60d7841/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)