ToolVet
80trust / 100

Portfolio Qaoa

by quantum.halowerk.com in Onchain & crypto

x402 APIPassing, checked 55 min ago

Enumerates every selection of exactly k assets for at most 16 assets, maximizing summed expected return minus a caller-selected covariance penalty. It runs no quantum circuit and provides a deterministic classical optimum for testing a corresponding binary QAOA or QUBO formulation; it is not investment advice and ignores transaction costs and allocation sizes.

POST
https://quantum.halowerk.com/v1/portfolio-qaoa
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
120 ms
187 ms slowest 5%
Last check
Passed
55 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://quantum.halowerk.com/v1/portfolio-qaoa

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://quantum.halowerk.com/v1/portfolio-qaoa
content-type: application/json

{
  "assets": [
    {
      "expected_return": 0.08,
      "name": "A"
    },
    {
      "expected_return": 0.06,
      "name": "B"
    },
    {
      "expected_return": 0.1,
      "name": "C"
    },
    {
      "expected_return": 0.04,
      "name": "D"
    }
  ],
  "covariance": [
    [
      0.04,
      0.01,
      0.015,
      0.005
    ],
    [
      0.01,
      0.03,
      0.008,
      0.004
    ],
    [
      0.015,
      0.008,
      0.06,
      0.006
    ],
    [
      0.005,
      0.004,
      0.006,
      0.02
    ]
  ],
  "risk_aversion": 0.7,
  "select_count": 2
}

Parameters

ParameterTypeRequiredDescription
assetsarray of objectYes
covariancearray of array of numberYes
risk_aversionnumberYes
select_countintegerYes

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://quantum.halowerk.com/v1/portfolio-qaoa' \
  -H 'content-type: application/json' \
  --data-raw '{"assets":[{"expected_return":0.08,"name":"A"},{"expected_return":0.06,"name":"B"},{"expected_return":0.1,"name":"C"},{"expected_return":0.04,"name":"D"}],"covariance":[[0.04,0.01,0.015,0.005],[0.01,0.03,0.008,0.004],[0.015,0.008,0.06,0.006],[0.005,0.004,0.006,0.02]],"risk_aversion":0.7,"select_count":2}'

# 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 - -X POST 'https://quantum.halowerk.com/v1/portfolio-qaoa' \
  -H 'content-type: application/json' \
  --data-raw '{"assets":[{"expected_return":0.08,"name":"A"},{"expected_return":0.06,"name":"B"},{"expected_return":0.1,"name":"C"},{"expected_return":0.04,"name":"D"}],"covariance":[[0.04,0.01,0.015,0.005],[0.01,0.03,0.008,0.004],[0.015,0.008,0.06,0.006],[0.005,0.004,0.006,0.02]],"risk_aversion":0.7,"select_count":2}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fquantum.halowerk.com%2Fv1%2Fportfolio-qaoa&method=POST
const res = await pay("https://quantum.halowerk.com/v1/portfolio-qaoa", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "assets": [
      {
        "expected_return": 0.08,
        "name": "A"
      },
      {
        "expected_return": 0.06,
        "name": "B"
      },
      {
        "expected_return": 0.1,
        "name": "C"
      },
      {
        "expected_return": 0.04,
        "name": "D"
      }
    ],
    "covariance": [
      [
        0.04,
        0.01,
        0.015,
        0.005
      ],
      [
        0.01,
        0.03,
        0.008,
        0.004
      ],
      [
        0.015,
        0.008,
        0.06,
        0.006
      ],
      [
        0.005,
        0.004,
        0.006,
        0.02
      ]
    ],
    "risk_aversion": 0.7,
    "select_count": 2
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://quantum.halowerk.com/v1/portfolio-qaoa",
        json={
            "assets": [
                {
                    "expected_return": 0.08,
                    "name": "A",
                },
                {
                    "expected_return": 0.06,
                    "name": "B",
                },
                {
                    "expected_return": 0.1,
                    "name": "C",
                },
                {
                    "expected_return": 0.04,
                    "name": "D",
                },
            ],
            "covariance": [
                [
                    0.04,
                    0.01,
                    0.015,
                    0.005,
                ],
                [
                    0.01,
                    0.03,
                    0.008,
                    0.004,
                ],
                [
                    0.015,
                    0.008,
                    0.06,
                    0.006,
                ],
                [
                    0.005,
                    0.004,
                    0.006,
                    0.02,
                ],
            ],
            "risk_aversion": 0.7,
            "select_count": 2,
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

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55 min agoPassed40294 ms$0.005
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