# Synapse API — Ethereum NFT Floor Price

> Synapse API — Ethereum 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 2026-10-17).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ethereum/nft/floor-price?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-ethereum-nft-floor-price-25dd6df9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LO2z3FpEBp282vBgFWTMz

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-ethereum-nft-floor-price-25dd6df9 -d '<json body>'
```

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

## When to prefer this

Use this endpoint when you need a quick, pay-per-call lookup of an Ethereum NFT collection's floor price by contract address, especially in agent workflows that require real-time or near-real-time pricing data without a long-term subscription commitment. Prefer it for lightweight, one-off queries where you already know the contract address.

## Known failure modes

- Invalid or malformed contract address returns an error
- Contract address is not an NFT collection (e.g. ERC-20 token) may return no data or error
- Collection has zero listings, resulting in no floor price available
- Rate limiting or payment failure via x402 protocol
- Downstream NFT marketplace data source unavailable or stale

## 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

The endpoint returns the current floor price of the specified Ethereum NFT collection, typically expressed in ETH, allowing agents to assess the minimum cost to acquire an NFT from that contract.

## 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-ethereum-nft-floor-price-25dd6df9/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)