US location lookup (lat/lon)

Resolve a US latitude/longitude to its county, state, and census block FIPS via the FCC Area API — the geographic context agents need for any coordinate. Live gov data, no key. ?lat=34.0522&lon=-118.2437

Input

Example output

{
  "lat": 34.0522,
  "lon": -118.2437,
  "county": "Los Angeles County",
  "state": "CA",
  "stateName": "California",
  "blockFips": "060372074001024",
  "source": "geo.fcc.gov (public domain)"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/geo-lookup?lat=34.0522&lon=-118.2437"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/geo-lookup?lat=34.0522&lon=-118.2437");

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