FRED series metadata

Metadata for a FRED series: title, frequency, units, seasonal adjustment, observation date range, and popularity. Send GET /api/fred-series-info with the required field seriesId and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with id, title, frequency, units, observationStart and 2 more.

Use before /api/fred-series to confirm the series fits your needs. ?seriesId=UNRATE This product uses the FRED(R) API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.

Category: Live public data · Tags: fred series metadata economic-data st-louis-fed macro

TRY IN PLAYGROUND →

Parameters

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for fred-series-info; any x402 v2 or MPP client pays it and retries.

Example response

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

From an MCP client

catalog.call {
  "slug": "fred-series-info",
  "params": {
    "seriesId": "UNRATE"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for fred-series-info; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• seriesId is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/fred-series-info is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/fred-series-info?seriesId=UNRATE");

Related tools