Water Quality

{
  "health_context": "Lead has no safe level for children. Even sub-MCL readings warrant filtration in homes with pre-1986 plumbing.",
  "quality_readings": [
    {
      "characteristic": "Lead",
      "date": "2026-04-15",
      "epa_mcl_mg_l": 0.015,
      "location": "Flint River at Flint, MI",
      "status": "Below action level",
      "unit": "mg/L",
      "value": "0.0082"
    }
  ],
  "query_summary": {
    "parameter": "lead",
    "sites_sampled": 12,
    "state": "MI"
  },
  "recommended_action": "Use NSF/ANSI 53-certified filter if lead detected. Contact local utility for free lead testing program.",
  "summary": {
    "sites_exceeding_limit": 1,
    "sites_within_limits": 11,
    "trend": "Improving — 40% reduction in detections vs 2023 baseline",
    "worst_reading": "0.018 mg/L lead at Saginaw County monitoring well (exceeds 0.015 MCL)"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://waterpulse.theaslangroupllc.com/api/water/quality?lang=en&parameter=nitrates&state=MI'

# 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://waterpulse.theaslangroupllc.com/api/water/quality?lang=en&parameter=nitrates&state=MI' \
  | 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 $0.08 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.08" });
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 $0.08 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwaterpulse.theaslangroupllc.com%2Fapi%2Fwater%2Fquality
const res = await pay("https://waterpulse.theaslangroupllc.com/api/water/quality?lang=en&parameter=nitrates&state=MI");
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 $0.08 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.08"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://waterpulse.theaslangroupllc.com/api/water/quality?lang=en&parameter=nitrates&state=MI")
    print(res.status_code, res.text)