ToolVet
75trust / 100

Quantum Observable Expectations

by Observable expectation values in Other

x402 APIPassing, checked 8 h ago

Calculate X, Y and Z Pauli expectations for a supplied valid single-qubit density matrix. Returns basis conventions; not a hardware measurement. New modular adapter: retained result recovery for 24 hours, minimal receipt metadata for 90 days. Existing live route unchanged.

POST https://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
185 ms typical, 185 ms slowest 5%
Last check
8 h ago
Next check
any minute now

How to call it

POST https://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations

Each call costs $0.016003 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://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations
content-type: application/json

{
  "dataClass": "synthetic",
  "state": {
    "imag": [
      0,
      0,
      0,
      0
    ],
    "real": [
      0.5,
      0.5,
      0.5,
      0.5
    ]
  }
}

Parameters

ParameterTypeRequiredDescription
dataClassstringYes One of: public, synthetic.
stateobjectYes

Example response

The provider's example. We can't check it without paying.

Example response, 30 lines
{
  "data": {
    "chargedAmount": "16003",
    "inputHash": "sha256:f388b3554df1ecac34cb11528806f2cb2079d56e5e782ee2baf2985e8…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "quantum-observable-expectations",
    "result": {
      "findings": {
        "X": 1,
        "Y": 0,
        "Z": 0,
        "convention": "single-qubit computational basis [0,1]; Pauli Y=[[0,-i],[i,0]]"
      },
      "limitations": [
        "Public or synthetic research inputs only; no patient, personal g…"
      ],
      "methodVersion": "maha-science50/1.0.0",
      "numericPrecision": "IEEE754-double; finite outputs rounded to 12 significant digits"
    },
    "resultHash": "sha256:c50e3c570f6e3868297158febde65a8de4fc2c91147e2e110b431cd01…",
    "sourceContractAmount": "16001",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.016003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","state":{"imag":[0,0,0,0],"real":[0.5,0.5,0.5,0.5]}}'

# 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://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","state":{"imag":[0,0,0,0],"real":[0.5,0.5,0.5,0.5]}}' \
  | 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 $0.016003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.016003" });
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 $0.016003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fquantum%2Fobservable-expectations&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "state": {
      "imag": [
        0,
        0,
        0,
        0
      ],
      "real": [
        0.5,
        0.5,
        0.5,
        0.5
      ]
    }
  }),
});
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 $0.016003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.016003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/compute/quantum/observable-expectations",
        json={
            "dataClass": "synthetic",
            "state": {
                "imag": [
                    0,
                    0,
                    0,
                    0,
                ],
                "real": [
                    0.5,
                    0.5,
                    0.5,
                    0.5,
                ],
            },
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
8 h agoPassed402185 ms$0.016