Drug Label

{
  "complete": true,
  "count": 1,
  "disclaimer": "openFDA data is unvalidated and is not medical advice; do not rely on it to make decisions regarding medical care.",
  "labels": [
    {
      "applicationNumber": "NDA020702",
      "brandName": "Lipitor",
      "effectiveDate": "2024-04-15",
      "genericName": "ATORVASTATIN CALCIUM",
      "manufacturer": "Viatris Specialty LLC",
      "productNdc": [
        "58151-155"
      ],
      "productNdcCount": 4,
      "productType": "HUMAN PRESCRIPTION DRUG",
      "routes": [
        "ORAL"
      ],
      "sections": {
        "boxedWarning": null,
        "contraindications": {
          "chars": 300,
          "text": "4 CONTRAINDICATIONS ...",
          "truncated": false
        },
        "dosage": {
          "chars": 2650,
          "text": "2 DOSAGE AND ADMINISTRATION ...",
          "truncated": true
        },
        "indications": {
          "chars": 2199,
          "text": "1 INDICATIONS AND USAGE LIPITOR is indicated: ...",
          "truncated": true
        },
        "warnings": {
          "chars": 7166,
          "text": "5 WARNINGS AND PRECAUTIONS ...",
          "truncated": true
        }
      },
      "splSetId": "a60cc18b-0631-4cf0-b021-9f52224ece65",
      "url": "https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=a60cc18b-0631-4cf0-b021-9f52224ece65",
      "version": "8"
    }
  ],
  "matched": 1,
  "maxChars": 1500,
  "query": {
    "name": "lipitor",
    "ndc": null
  },
  "returned": 1,
  "source": "api.fda.gov (openFDA drug labeling, public domain)",
  "truncated": false
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agent402.tools/api/drug-label?limit=1&name=lipitor'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://agent402.tools/api/drug-label?limit=1&name=lipitor' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fdrug-label
const res = await pay("https://agent402.tools/api/drug-label?limit=1&name=lipitor");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://agent402.tools/api/drug-label?limit=1&name=lipitor")
    print(res.status_code, res.text)