Locus House Price Index

{
  "area": {
    "state": "NC"
  },
  "attribution": "This product uses the FRED(r) API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.",
  "caveats": [
    "FHFA All-Transactions House Price Index (via FRED). An index (base period = 100), not a dollar value or an appraisal.",
    "Locus does not label a market hot, cold, appreciating, or declining; this is the index value and a computed period-over-period change only.",
    "This product uses the FRED(r) API but is not endorsed or certified by the Federal Reserve Bank of St. Louis."
  ],
  "citation": {
    "fetchedAt": "2026-09-23T01:11:16.004Z",
    "source": "FHFA All-Transactions House Price Index (distributed via FRED, Federal Reserve Bank of St. Louis)",
    "sourceUrl": "https://fred.stlouisfed.org/series/NCSTHPI"
  },
  "housePriceIndex": {
    "available": true,
    "latest": {
      "date": "2026-04-01",
      "index": 707.79
    },
    "seriesId": "NCSTHPI",
    "units": "Index (base period = 100), quarterly, not seasonally adjusted",
    "yoyPctChange": 2.39
  },
  "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
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.locus.report/api/locus-house-price-index' \
  -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-house-price-index' \
  -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 $0.05 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%2Fapi.locus.report%2Fapi%2Flocus-house-price-index&method=POST
const res = await pay("https://api.locus.report/api/locus-house-price-index", {
  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 $0.05 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://api.locus.report/api/locus-house-price-index",
        json={
            "address": "1 E Edenton St, Raleigh, NC 27601",
        },
    )
    print(res.status_code, res.text)