Locus Groundwater Context

{
  "caveats": [
    "USGS groundwater monitoring wells are often purpose-drilled observation wells, not domestic wells; their construction depths and water levels do not predict the depth, yield, or feasibility of a future household well.",
    "USGS fields are sparse. A missing well depth or aquifer code is reported as unknown rather than zero, shallow, or evidence that no aquifer is present."
  ],
  "componentStatus": {
    "aquiferNames": "ok",
    "fieldMeasurements": "ok",
    "monitoringLocations": "ok"
  },
  "message": "Nearby USGS groundwater monitoring records were found. They describe observation locations and do not predict a domestic well at the subject property.",
  "monitoringWells": {
    "aquiferReportedCount": 69,
    "aquiferUnknownCount": 0,
    "aquifers": [
      {
        "code": "N400PDMBRX",
        "monitoringWellCount": 69,
        "name": "Piedmont and Blue Ridge crystalline-rock aquifers",
        "scope": "national"
      },
      {
        "code": "110SPRL",
        "monitoringWellCount": 1,
        "name": "Saprolite",
        "scope": "local"
      }
    ],
    "depthDistribution": {
      "max": 800,
      "median": 245,
      "min": 18,
      "reportedCount": 66,
      "totalWellCount": 69,
      "unit": "ft below land-surface datum",
      "unknownCount": 3
    },
    "queryLimited": false,
    "totalFound": 69
  },
  "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,
  "point": {
    "latitude": 35.780418000003195,
    "longitude": -78.63910200000142
  },
  "provenance": {
    "fetchedAt": "2026-09-23T01:11:21.665Z",
    "fieldMeasurementsCollection": "https://api.waterdata.usgs.gov/ogcapi/v0/collections/field-measurements/items",
    "monitoringLocationsCollection": "https://api.waterdata.usgs.gov/ogcapi/v0/collections/monitoring-locations/items",
    "source": "USGS Water Data OGC API",
    "sourcePage": "https://api.waterdata.usgs.gov/ogcapi/v0/collections/monitoring-locations"
  },
  "radiusMeters": 5000,
  "state": "data",
  "staticWaterLevel": {
    "mostRecent": {
      "approvalStatus": "Approved",
      "datum": "NAVD88",
      "distanceBand": "1_to_3_km",
      "distanceBandLabel": "1-3 km away",
      "kind": "elevation_above_vertical_datum",
      "measuredAt": "2026-08-13T17:41:00+00:00",
      "monitoringLocationId": "USGS-354649078400702",
      "parameterCode": "62611",
      "unit": "ft",
      "value": 313.39
    },
    "multiYearRecordExists": true,
    "status": "observed",
    "trend": {
      "annualChange": null,
      "basis": "58 static measurements across 8 distinct years and 7.17 years; insufficient for a directional statement under the conservative Locus threshold.",
      "direction": null,
      "distinctYearCount": 8,
      "fitR2": null,
      "measurementCount": 58,
      "spanYears": 7.17,
      "status": "insufficient_record",
      "unitPerYear": null
    }
  },
  "verifyNext": [
    {
      "step": "Open the USGS Water Data monitoring-location collection and verify the cited monitoring-location ID and measurement series.",
      "url": "https://api.waterdata.usgs.gov/ogcapi/v0/collections/monitoring-locations"
    },
    {
      "step": "Check locus_sole_source_aquifer for EPA designation context: it explains federal project review under SDWA -1424(e), not current water quality or a private-owner restriction.",
      "url": "https://api.locus.report/tools/call"
    }
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.locus.report/api/locus-groundwater-context' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"1 E Edenton St, Raleigh, NC 27601","radiusMeters":5000}'

# 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-groundwater-context' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"1 E Edenton St, Raleigh, NC 27601","radiusMeters":5000}' \
  | 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-groundwater-context&method=POST
const res = await pay("https://api.locus.report/api/locus-groundwater-context", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "1 E Edenton St, Raleigh, NC 27601",
    "radiusMeters": 5000
  }),
});
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-groundwater-context",
        json={
            "address": "1 E Edenton St, Raleigh, NC 27601",
            "radiusMeters": 5000,
        },
    )
    print(res.status_code, res.text)