FDA drug label lookup

FDA drug labeling (openFDA SPL) by brand or generic name, or by NDC: boxed warning, indications and usage, dosage and administration, contraindications, and warnings and precautions, with manufacturer, routes, application number, NDCs and the label's effective date. Send GET /api/drug-label with no required fields (4 optional) and pay $0.004 per call over x402 or MPP (there is no free tier). It returns a JSON object with query, count, labels, returned, matched and 5 more.

Each section reports its full length and whether it was cut. Newest label first; the answer says how many labels matched. Live FDA data, no key.

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Parameters

Example request

curl -i "https://agent402.tools/api/drug-label?name=lipitor&limit=1"

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

Example response

{
  "query": {
    "name": "lipitor",
    "ndc": null
  },
  "count": 1,
  "labels": [
    {
      "brandName": "Lipitor",
      "genericName": "ATORVASTATIN CALCIUM",
      "manufacturer": "Viatris Specialty LLC",
      "productType": "HUMAN PRESCRIPTION DRUG",
      "routes": [
        "ORAL"
      ],
      "applicationNumber": "NDA020702",
      "productNdc": [
        "58151-155"
      ],
      "productNdcCount": 4,
      "splSetId": "a60cc18b-0631-4cf0-b021-9f52224ece65",
      "effectiveDate": "2024-04-15",
      "version": "8",
      "sections": {
        "boxedWarning": null,
        "indications": {
          "text": "1 INDICATIONS AND USAGE LIPITOR is indicated: ...",
          "chars": 2199,
          "truncated": true
        },
        "dosage": {
          "text": "2 DOSAGE AND ADMINISTRATION ...",
          "chars": 2650,
          "truncated": true
        },
        "contraindications": {
          "text": "4 CONTRAINDICATIONS ...",
          "chars": 300,
          "truncated": false
        },
        "warnings": {
          "text": "5 WARNINGS AND PRECAUTIONS ...",
          "chars": 7166,
          "truncated": true
        }
      },
      "url": "https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=a60cc18b-0631-4cf0-b021-9f52224ece65"
    }
  ],
  "returned": 1,
  "matched": 1,
  "complete": true,
  "truncated": false,
  "maxChars": 1500,
  "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 drug labeling, public domain)"
}

From an MCP client

catalog.call {
  "slug": "drug-label",
  "params": {
    "name": "lipitor",
    "limit": 1
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for drug-label; 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-label 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-label?name=lipitor&limit=1");

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