FRED series metadata

Metadata for a FRED series: title, frequency, units, seasonal adjustment, observation date range, and popularity. Use before /api/fred-series to confirm the series fits your needs. ?seriesId=UNRATE

Input

Field	Type	Description
seriesId *	string	FRED series ID, e.g. UNRATE

Example output

{
  "id": "UNRATE",
  "title": "Unemployment Rate",
  "frequency": "Monthly",
  "units": "Percent",
  "observationStart": "1948-01-01",
  "observationEnd": "2026-05-01",
  "popularity": 94
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/fred-series-info?seriesId=UNRATE"

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/fred-series-info?seriesId=UNRATE");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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