Skill: Forecasting bake-off

Bundled execution of the Forecasting bake-off workflow — Don't guess which forecasting method to trust. Backtest all four (naive/drift, SES, Holt, Holt-Winters) on a real series, rank by out-of-sample RMSE, then forecast forward with the winner and its 95% prediction interval. Method selection without the hand-waving. One x402 payment runs 7 underlying tools (stock-history, fred-series, forecast-eval, forecast-naive, forecast-ses, forecast-holt, forecast-holt-winters); partial-success per step.

Input

Field	Type	Description
series *	string	What to forecast — a ticker (AAPL) or a FRED series id (UNRATE, CPIAUCSL)
horizon	string	How many periods to project forward — e.g. 30 (days for daily data, months for monthly)

Example output

{
  "pack": "forecasting-bake-off",
  "args": {
    "series": "AAPL",
    "horizon": "30"
  },
  "steps": [
    {
      "slug": "stock-history",
      "ok": true,
      "result": {}
    },
    {
      "slug": "fred-series",
      "ok": true,
      "result": {}
    },
    {
      "slug": "forecast-eval",
      "ok": true,
      "result": {}
    },
    {
      "slug": "forecast-naive",
      "ok": true,
      "result": {}
    },
    {
      "slug": "forecast-ses",
      "ok": true,
      "result": {}
    },
    {
      "slug": "forecast-holt",
      "ok": true,
      "result": {}
    },
    {
      "slug": "forecast-holt-winters",
      "ok": true,
      "result": {}
    }
  ],
  "summary": "7/7 steps succeeded"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/skill/forecasting-bake-off \
  -H "Content-Type: application/json" \
  -d '{"series":"AAPL","horizon":"30"}'

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/skill/forecasting-bake-off", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "series": "AAPL",
    "horizon": "30"
  }),
});

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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