Check

{
  "counts": {
    "current": 17,
    "resolved": 0,
    "to_be_discontinued": 2,
    "total": 19
  },
  "found": true,
  "in_shortage": true,
  "listings": [
    {
      "availability": "Unavailable",
      "brand_names": null,
      "company_name": "Accord Healthcare Inc.",
      "dosage_form": "Injection",
      "fda_database_url": "https://www.fda.gov/drugs/drug-safety-and-availability/drug-shortages",
      "generic_name": "Atropine Sulfate Injection",
      "initial_posting_date": "2012-01-01",
      "package_ndc": "16729-525-08",
      "presentation": "Atropine Sulfate, Injection, .4 mg/1 mL (NDC 16729-525-08)",
      "shortage_reason": "Requirements related to complying with good manufacturing practices",
      "status": "Current",
      "status_label": "Currently in Shortage",
      "therapeutic_category": [
        "Anesthesia",
        "Neurology",
        "Pediatric"
      ]
    }
  ],
  "query": {
    "name": "Atropine Sulfate"
  },
  "verdict": "currently_in_shortage"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://drug-shortage-check.iykykblog.workers.dev/check' \
  -H 'content-type: application/json' \
  --data-raw '{"name":"Atropine Sulfate"}'

# 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 - -X POST 'https://drug-shortage-check.iykykblog.workers.dev/check' \
  -H 'content-type: application/json' \
  --data-raw '{"name":"Atropine Sulfate"}' \
  | 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fdrug-shortage-check.iykykblog.workers.dev%2Fcheck&method=POST
const res = await pay("https://drug-shortage-check.iykykblog.workers.dev/check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "name": "Atropine Sulfate"
  }),
});
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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://drug-shortage-check.iykykblog.workers.dev/check",
        json={
            "name": "Atropine Sulfate",
        },
    )
    print(res.status_code, res.text)