NFT floor price

Get the current floor price for an NFT collection across OpenSea + LooksRare (Ethereum). Send POST /api/nft-floor with the required field contract and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with contract, network, openSea, looksRare, cheapestFloorEth and 2 more.

Returns per-marketplace floor (ETH), collection URL, retrieval timestamp, and the cheapest cross-marketplace floor with the marketplace tag. Use to price a collection without scraping marketplace UIs, or to detect cross-venue arbitrage gaps.

Category: Crypto & onchain data · Tags: nft floor price opensea looksrare marketplace

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/nft-floor \
  -H "Content-Type: application/json" \
  -d '{"contract":"0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"}'

Without payment this returns HTTP 402 Payment Required with the exact price for nft-floor; any x402 v2 or MPP client pays it and retries.

Example response

{
  "contract": "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d",
  "network": "ethereum",
  "openSea": {
    "available": true,
    "floorPrice": 13.5,
    "priceCurrency": "ETH",
    "collectionUrl": "https://opensea.io/collection/boredapeyachtclub",
    "retrievedAt": "2026-06-22T19:00:00.000Z"
  },
  "looksRare": {
    "available": true,
    "floorPrice": 13.7,
    "priceCurrency": "ETH",
    "collectionUrl": "https://looksrare.org/collections/0xbc4c...",
    "retrievedAt": "2026-06-22T19:00:00.000Z"
  },
  "cheapestFloorEth": 13.5,
  "cheapestMarketplace": "opensea",
  "source": "alchemy-nft-v3"
}

From an MCP client

catalog.call {
  "slug": "nft-floor",
  "params": {
    "contract": "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for nft-floor; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• contract is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/nft-floor returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/nft-floor", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "contract": "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"
  }),
});

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