Forecast backtest (MAPE + RMSE) · Forecast Eval

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://agent402.tools/api/forecast-eval", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "method": "drift",
    "testSize": 3,
    "values": [
      10,
      12,
      13,
      12,
      15,
      16,
      18,
      19,
      21,
      22
    ]
  }),
});
const data = await res.json();

curl -X POST \
  "https://agent402.tools/api/forecast-eval" \
  -H "Content-Type: application/json" \
  -d '{"method":"drift","testSize":3,"values":[10,12,13,12,15,16,18,19,21,22]}' \
  -H "X-PAYMENT: <signed x402 payment>"

{
  "forecast": [
    {
      "actual": 19,
      "predicted": 19.3333,
      "step": 1
    },
    {
      "actual": 21,
      "predicted": 20.6667,
      "step": 2
    },
    {
      "actual": 22,
      "predicted": 22,
      "step": 3
    }
  ],
  "mape": 1.1139,
  "method": "drift",
  "n": 10,
  "rmse": 0.2722,
  "testSize": 3,
  "trainSize": 7,
  "warnings": []
}