ToolVet
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Micro Covariance Uncertainty

by mahastrategies.com in Other

x402 APIPassing, checked 1 h ago

Propagate declared correlated measurement uncertainty for 1-8 sensitivities using c-transpose C c. Requires exact symmetric positive-semidefinite covariance; returns exact variance and a rational square-root enclosure. First-order only; no empirical covariance validation.

POST https://www.mahastrategies.com/api/v1/micro/covariance-uncertainty

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
472 ms typical, 1.8 s slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

POST https://www.mahastrategies.com/api/v1/micro/covariance-uncertainty

Each call costs $0.013 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/micro/covariance-uncertainty
content-type: application/json

{
  "covariance": [
    [
      "4",
      "1"
    ],
    [
      "1",
      "9"
    ]
  ],
  "dataClass": "synthetic",
  "outputUnit": "m",
  "sensitivities": [
    "1",
    "2"
  ]
}

Parameters

ParameterTypeRequiredDescription
covariancearrayYes
dataClassstringYes One of: public, synthetic.
outputUnitstringYes
sensitivitiesarrayYes

Example response

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

Example response, 30 lines
{
  "amountBaseUnits": "13000",
  "boundaries": [
    "Public or synthetic inputs only. Caller labels are declarations,…"
  ],
  "inputDigest": "sha256:96cce62ef3f856719b0572691394b65e6702d277e2b63694e2338dd9b…",
  "offerId": "covariance-uncertainty",
  "receiptDigest": "sha256:eccd881b26d295578f95ecf0c2319f2173453391bb68a138185a50a5f…",
  "result": {
    "covariancePositiveSemidefinite": true,
    "inputEstimatesVerified": false,
    "model": "first-order-sensitivity-propagation",
    "outputUnit": "m",
    "standardUncertainty": {
      "lower": {
        "denominator": "50000000",
        "numerator": "331662479"
      },
      "upper": {
        "denominator": "1000000000",
        "numerator": "6633249581"
      }
    },
    "variance": {
      "denominator": "1",
      "numerator": "44"
    }
  },
  "version": "maha-microproducts/0.1"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.013.

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/micro/covariance-uncertainty' \
  -H 'content-type: application/json' \
  --data-raw '{"covariance":[["4","1"],["1","9"]],"dataClass":"synthetic","outputUnit":"m","sensitivities":["1","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://www.mahastrategies.com/api/v1/micro/covariance-uncertainty' \
  -H 'content-type: application/json' \
  --data-raw '{"covariance":[["4","1"],["1","9"]],"dataClass":"synthetic","outputUnit":"m","sensitivities":["1","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 $0.013 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.013" });
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 $0.013 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fmicro%2Fcovariance-uncertainty&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/micro/covariance-uncertainty", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "covariance": [
      [
        "4",
        "1"
      ],
      [
        "1",
        "9"
      ]
    ],
    "dataClass": "synthetic",
    "outputUnit": "m",
    "sensitivities": [
      "1",
      "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 $0.013 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.013"})
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/micro/covariance-uncertainty",
        json={
            "covariance": [
                [
                    "4",
                    "1",
                ],
                [
                    "1",
                    "9",
                ],
            ],
            "dataClass": "synthetic",
            "outputUnit": "m",
            "sensitivities": [
                "1",
                "2",
            ],
        },
    )
    print(res.status_code, res.text)

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