Volatility

{
  "annualizedArithmeticMeanPct": -8.743006319e-15,
  "annualizedGeometricReturnPct": -2.126909258,
  "annualizedVolatility": 0.2314087293,
  "annualizedVolatilityPct": 23.14087293,
  "asOf": "2026-10-12T00:57:41.411Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "educationalOnly": "Educational arithmetic on the numbers you supplied. Not investment advice: it does not say what to buy, sell, hold or how much to risk, and a supplied or past series does not predict the future.",
  "inputKind": "returns",
  "meanReturnPerPeriod": 0,
  "notChecked": [
    "whether returns are normal, independent or stationary (volatility is one number for a series that may not be steady)",
    "fat tails and jumps that standard deviation understates",
    "…1 more"
  ],
  "observations": 5,
  "periodVolatility": 0.01457737974,
  "periodVolatilityPct": 1.457737974,
  "periodsPerYear": 252,
  "reasons": [
    "Sample standard deviation (divides by n - 1) of the period returns, times the square root of periodsPerYear.",
    "Returns were used as supplied.",
    "…1 more"
  ],
  "source": "computed locally",
  "summary": "Period volatility 1.457737974%, annualised 23.14087293% over 5 returns at 252 periods a year.",
  "verdict": "VOLATILITY_COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://portfolio-stats.x402tookit.com/volatility?periodsPerYear=252&returns=%5B0.01%2C-0.02%2C0.015%2C0.005%2C-0.01%5D'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://portfolio-stats.x402tookit.com/volatility?periodsPerYear=252&returns=%5B0.01%2C-0.02%2C0.015%2C0.005%2C-0.01%5D' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fportfolio-stats.x402tookit.com%2Fvolatility
const res = await pay("https://portfolio-stats.x402tookit.com/volatility?periodsPerYear=252&returns=%5B0.01%2C-0.02%2C0.015%2C0.005%2C-0.01%5D");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://portfolio-stats.x402tookit.com/volatility?periodsPerYear=252&returns=%5B0.01%2C-0.02%2C0.015%2C0.005%2C-0.01%5D")
    print(res.status_code, res.text)