Locus Radon Zone

{
  "cache": {
    "fetchedAt": "2026-09-09T15:21:08.094Z",
    "hit": true
  },
  "caveats": [
    "EPA's map is county-level radon potential, not a building-specific radon measurement.",
    "EPA says the map should not be used to decide whether an individual home needs testing; test the building to know the indoor radon level.",
    "This is a testing and disclosure follow-up item, not a medical, safety, exposure, or mitigation conclusion."
  ],
  "county": "Wake County",
  "countyFips5": "37183",
  "countyState": "Wake, NC",
  "epaHighRadonPotential": false,
  "epaRegion": "4",
  "matched": true,
  "note": "Awareness/diagnostic only. Full briefs are x402-paid. Agents can discover live free tools at https://api.locus.report/tools/list and paid tools, prices, and manifests at https://api.locus.report/.well-known/ai-tool/index.json.",
  "ok": true,
  "overhangs": [],
  "point": {
    "latitude": 35.780418000003195,
    "longitude": -78.63910200000142
  },
  "provenance": {
    "coverage": "United States, county-level",
    "source": "EPA Map of Radon Zones",
    "sourceData": "https://www.epa.gov/system/files/other-files/2024-06/radon-zones-202406.json",
    "sourcePage": "https://www.epa.gov/radon/epa-map-radon-zones-0",
    "sourceWorkbook": "https://www.epa.gov/system/files/documents/2024-05/radon_zones-spreadsheet.xls",
    "stateSupportingDocuments": "https://www.epa.gov/radon/epa-maps-radon-zones-and-supporting-documents-state"
  },
  "radonZone": 2,
  "resolvedCounty": {
    "countyFips3": "183",
    "countyFips5": "37183",
    "countyName": "Wake County",
    "stateAbbr": "NC",
    "stateFips": "37"
  },
  "state": "North Carolina",
  "stateAbbr": "NC",
  "verifyNext": [
    {
      "source": "EPA Map of Radon Zones",
      "step": "Confirm the county's EPA radon-zone entry in the official EPA text-version dataset.",
      "url": "https://www.epa.gov/system/files/other-files/2024-06/radon-zones-202406.json"
    },
    {
      "source": "EPA Map of Radon Zones",
      "step": "Use building-specific radon testing before treating the county zone as actionable for a particular home or unit.",
      "url": "https://www.epa.gov/radon/epa-map-radon-zones-0"
    }
  ],
  "zoneMeaning": "moderate EPA radon potential category"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.locus.report/api/locus-radon-zone' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"1 E Edenton St, Raleigh, NC 27601"}'

# 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://api.locus.report/api/locus-radon-zone' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"1 E Edenton St, Raleigh, NC 27601"}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.locus.report%2Fapi%2Flocus-radon-zone&method=POST
const res = await pay("https://api.locus.report/api/locus-radon-zone", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "1 E Edenton St, Raleigh, NC 27601"
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.locus.report/api/locus-radon-zone",
        json={
            "address": "1 E Edenton St, Raleigh, NC 27601",
        },
    )
    print(res.status_code, res.text)