ToolVet
78trust / 100

Signals Aliasing Check

by Sampling and aliasing check in Security & trust

x402 APIPassing, checked 32 min ago

Check a declared bandwidth and up to 16 tones against the strict Nyquist inequality, with equality reported separately. Computes folded tone frequencies exactly. Assumes uniform sampling, bandlimited input and no jitter; does not verify filters, acquisition hardware or real signal bandwidth. 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/signals/aliasing-check

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
160 ms typical, 160 ms slowest 5%
Last check
32 min ago
Next check
any minute now

How to call it

POST https://www.mahastrategies.com/api/v1/compute/signals/aliasing-check

Each call costs $0.010026 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/signals/aliasing-check
content-type: application/json

{
  "assumption": "uniform-bandlimited-no-jitter",
  "dataClass": "public",
  "highestBandHz": "70",
  "sampleRateHz": "100",
  "tonesHz": [
    "20",
    "70"
  ]
}

Parameters

ParameterTypeRequiredDescription
assumptionstringYes One of: uniform-bandlimited-no-jitter.
dataClassstringYes One of: public, synthetic.
highestBandHzstringYes
sampleRateHzstringYes
tonesHzarrayYes

Example response

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

Example response, 32 lines
{
  "data": {
    "chargedAmount": "10026",
    "inputHash": "sha256:531b3782d4c84491255be949b96bc3e6e35487379048152839cbe88ad…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "sampling-aliasing-check",
    "result": {
      "assumptions": "uniform-bandlimited-no-jitter; declared-bandwidth; filters-unver…",
      "dataClass": "public",
      "hardwareVerified": false,
      "nyquistHz": "50",
      "requiredRateExclusiveHz": "140",
      "state": "undersampled",
      "tones": [
        {
          "aliases": false,
          "foldedHz": "20",
          "frequencyHz": "20"
        }
      ]
    },
    "resultHash": "sha256:f9f821818930dd01105f5ad6b9c4809f06cd558d3addaa1a7594115d6…",
    "sourceContractAmount": "6500",
    "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 $0.010026.

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/signals/aliasing-check' \
  -H 'content-type: application/json' \
  --data-raw '{"assumption":"uniform-bandlimited-no-jitter","dataClass":"public","highestBandHz":"70","sampleRateHz":"100","tonesHz":["20","70"]}'

# 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/signals/aliasing-check' \
  -H 'content-type: application/json' \
  --data-raw '{"assumption":"uniform-bandlimited-no-jitter","dataClass":"public","highestBandHz":"70","sampleRateHz":"100","tonesHz":["20","70"]}' \
  | 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 $0.010026 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.010026" });
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 $0.010026 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fsignals%2Faliasing-check&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/signals/aliasing-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "assumption": "uniform-bandlimited-no-jitter",
    "dataClass": "public",
    "highestBandHz": "70",
    "sampleRateHz": "100",
    "tonesHz": [
      "20",
      "70"
    ]
  }),
});
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 $0.010026 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.010026"})
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/signals/aliasing-check",
        json={
            "assumption": "uniform-bandlimited-no-jitter",
            "dataClass": "public",
            "highestBandHz": "70",
            "sampleRateHz": "100",
            "tonesHz": [
                "20",
                "70",
            ],
        },
    )
    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
32 min agoPassed402256 ms$0.01
10 h agoPassed402160 ms$0.01