# Synapse API — Arbitrum NFT Floor Price

> Synapse API — Arbitrum 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 2026-09-14).

Returns the current floor price for an NFT collection deployed on the Arbitrum blockchain given its contract address.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/arbitrum/nft/floor-price
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-arbitrum-nft-floor-price-590c4960
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MegYJokKISXvMqN7xVmM4

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-arbitrum-nft-floor-price-590c4960 -d '<json body>'
```

Example prompt: What's the current NFT floor price for the contract at 0x3d2341ADb2D31f1c5530cDC622016af293177AE0 on Arbitrum?

## When to prefer this

Use this endpoint when you need fast, pay-per-call floor price lookups specifically for NFT collections on the Arbitrum network without managing your own blockchain node or indexing infrastructure. Prefer it for lightweight, on-demand queries where you need current market pricing for a single contract rather than historical analytics or multi-chain aggregation in a single call.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty result
- Contract exists on a different chain and is not found on Arbitrum
- NFT collection has no active listings, resulting in null or zero floor price
- Network or RPC timeout causing delayed or failed response
- Malformed contract address format causes a validation 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

The endpoint returns the current floor price of the specified NFT collection on Arbitrum, typically including the price value and its denomination (e.g., ETH or USDC), allowing agents to assess the minimum buy-in for an NFT collection on that network.

## 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-arbitrum-nft-floor-price-590c4960/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)