Barcode product lookup

Look up a product by its UPC/EAN barcode number via Open Food Facts (open data): name, brand, category, quantity, and nutrition grade. Send GET /api/barcode-lookup with the required field code and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with code, found and product.

Pairs with /api/barcode-decode (image → number → product). ?code=737628064502

Category: Live public data · Tags: barcode upc ean product lookup open-food-facts

TRY IN PLAYGROUND →

Parameters

Example request

curl -i "https://agent402.tools/api/barcode-lookup?code=737628064502"

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

Example response

{
  "code": "737628064502",
  "found": true,
  "product": {
    "name": "Thai peanut noodle kit",
    "brands": "Simply Asia",
    "categories": "Meals",
    "quantity": "155 g",
    "nutritionGrade": "d",
    "countries": "United States"
  }
}

From an MCP client

catalog.call {
  "slug": "barcode-lookup",
  "params": {
    "code": "737628064502"
  }
}

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

Errors and behavior

• code 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.
• Cached: an identical request within 1d is answered from cache with X-Cache: hit.
• A POST with a JSON body to /api/barcode-lookup is served as this GET, with the body as the input.
• 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/barcode-lookup?code=737628064502");

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