# Synapse API — Optimism NFT Floor Price

> Synapse API — Optimism 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 2026-10-27).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/optimism/nft/floor-price?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-optimism-nft-floor-price-fa637a55
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q2oS9dV8mlQX_zWThYIce

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-optimism-nft-floor-price-fa637a55 -d '<json body>'
```

Example prompt: What's the current floor price for the NFT collection at contract address 0x1234...abcd on Optimism?

## When to prefer this

Use this endpoint when you specifically need floor price data for an NFT collection deployed on the Optimism (OP) Layer 2 network. It is pay-per-call at $0.01 USDC via x402, making it cost-effective for spot lookups. Prefer this over general NFT APIs when you need Optimism-specific data and want to pay only for what you use without a subscription.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty result
- Contract address is on a different chain (not Optimism) causing no data found
- NFT collection has no active listings so floor price is unavailable
- Malformed contract address format causes a validation error
- Network or upstream data source outage returns a 503 or timeout

## 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 contract on the Optimism network, typically expressed as a numeric value in ETH or the relevant native token, representing the lowest listed price for any NFT in that collection.

## 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-optimism-nft-floor-price-fa637a55/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)