Portfolio Risk

{
  "asOf": "2026-10-11T20:30:29.991Z",
  "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.",
  "diversificationBenefitPts": 1.6493,
  "expectedReturnPct": 6.4,
  "minVarianceVolPct": 5.90653,
  "minVarianceWeightAPct": 6.62461,
  "notChecked": [
    "whether the inputs are right: expected returns, volatility and correlation are estimates and correlations rise in crises",
    "more than two assets and rebalancing costs",
    "…2 more"
  ],
  "reasons": [
    "Portfolio variance = wA^2 sA^2 + wB^2 sB^2 + 2 wA wB rho sA sB; return is the weighted average.",
    "The lowest-volatility mix is 6.6% A, at 5.91% volatility."
  ],
  "returnPerUnitRisk": 0.61832,
  "source": "computed locally",
  "summary": "60% A / 40% B: expected return 6.4%, volatility 10.35% (the weighted average of the two volatilities would be 12%, so diversification saves 1.65 points).",
  "verdict": "COMPUTED",
  "volatilityPct": 10.3507,
  "weightAPct": 60,
  "weightBPct": 40,
  "weightedAverageVolPct": 12
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://invest-math.x402tookit.com/portfolio-risk?correlation=0.2&returnAPct=8&returnBPct=4&volAPct=16&volBPct=6&weightA=60'

# 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://invest-math.x402tookit.com/portfolio-risk?correlation=0.2&returnAPct=8&returnBPct=4&volAPct=16&volBPct=6&weightA=60' \
  | 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%2Finvest-math.x402tookit.com%2Fportfolio-risk
const res = await pay("https://invest-math.x402tookit.com/portfolio-risk?correlation=0.2&returnAPct=8&returnBPct=4&volAPct=16&volBPct=6&weightA=60");
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://invest-math.x402tookit.com/portfolio-risk?correlation=0.2&returnAPct=8&returnBPct=4&volAPct=16&volBPct=6&weightA=60")
    print(res.status_code, res.text)