Codes Lookup

{
  "billable": null,
  "catalog": {
    "coverage": "seed",
    "coverage_meaning": "Compiled seed catalog. Production coverage=full is gold-gated Current Prescribable RxNorm + ICD-10-CM + LOINC, not complete monthly RxNorm or UMLS.",
    "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm codes are RxCUI. LOINC codes are official LOINC numerics. coverage=full never means complete UMLS.",
    "source": "magent curated seed",
    "stale": false,
    "systems": [
      "rxnorm",
      "icd10",
      "loinc"
    ],
    "verified_at": null,
    "version": "2026.08-wedge"
  },
  "code": "198440",
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "display": "acetaminophen 500 MG Oral Tablet",
  "found": true,
  "obsolete": false,
  "status": "current",
  "synonyms": [
    "tylenol 500mg",
    "tylenol 500 mg",
    "acetaminophen 500mg",
    "acetaminophen 500 mg tablet",
    "paracetamol 500 mg"
  ],
  "system": "rxnorm",
  "tty": "SCD"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.magentlab.com/api/codes/lookup?code=198440&system=rxnorm'

# 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://api.magentlab.com/api/codes/lookup?code=198440&system=rxnorm' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.magentlab.com%2Fapi%2Fcodes%2Flookup
const res = await pay("https://api.magentlab.com/api/codes/lookup?code=198440&system=rxnorm");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.magentlab.com/api/codes/lookup?code=198440&system=rxnorm")
    print(res.status_code, res.text)