FDA NDC directory lookup

Look up the FDA National Drug Code directory (openFDA) by NDC or by brand or generic name: product NDC, labeler, dosage form, routes, active ingredients with strengths, marketing category and application number, pharmacologic class, marketing and listing dates, and the package NDCs with their descriptions. Send GET /api/drug-ndc with no required fields (3 optional) and pay $0.004 per call over x402 or MPP (there is no free tier). It returns a JSON object with query, count, products, returned, matched and 4 more.

The answer says how many products matched. Live FDA data, no key.

Try in playground →

Parameters

Example request

curl -i "https://agent402.tools/api/drug-ndc?ndc=58151-155"

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

Example response

{
  "query": {
    "ndc": "58151-155",
    "name": null
  },
  "count": 1,
  "products": [
    {
      "productNdc": "58151-155",
      "brandName": "Lipitor",
      "genericName": "atorvastatin calcium",
      "labeler": "Viatris Specialty LLC",
      "dosageForm": "TABLET, FILM COATED",
      "routes": [
        "ORAL"
      ],
      "productType": "HUMAN PRESCRIPTION DRUG",
      "marketingCategory": "NDA",
      "applicationNumber": "NDA020702",
      "activeIngredients": [
        {
          "name": "ATORVASTATIN CALCIUM TRIHYDRATE",
          "strength": "10 mg/1"
        }
      ],
      "pharmClass": [
        "HMG-CoA Reductase Inhibitor [EPC]"
      ],
      "marketingStartDate": "2024-05-01",
      "listingExpirationDate": "2027-12-31",
      "finished": true,
      "packaging": [
        {
          "packageNdc": "58151-155-77",
          "description": "90 TABLET, FILM COATED in 1 BOTTLE (58151-155-77)",
          "marketingStartDate": "2024-05-01",
          "sample": false
        }
      ],
      "packagingCount": 1
    }
  ],
  "returned": 1,
  "matched": 1,
  "complete": true,
  "truncated": false,
  "disclaimer": "openFDA data is unvalidated and is not medical advice; do not rely on it to make decisions regarding medical care.",
  "source": "api.fda.gov (openFDA NDC directory, public domain)"
}

From an MCP client

catalog.call {
  "slug": "drug-ndc",
  "params": {
    "ndc": "58151-155"
  }
}

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

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• 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 POST with a JSON body to /api/drug-ndc 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?.({ maxAmountPerPayment: "$0.004" }); // refuse any quote above this tool's price
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/drug-ndc?ndc=58151-155");

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