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Numerics Unit Uncertainty

by Unit and Uncertainty Conversion in Documents & files

x402 APIPassing, checked 3 h ago

Convert a measurement without losing declared uncertainty: one decimal value and standard uncertainty across supported length, mass, time or temperature units using exact rational scale/offset arithmetic. No unit guessing, physical validation or expanded uncertainty. 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/numerics/unit-uncertainty

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
179 ms typical, 179 ms slowest 5%
Last check
3 h ago
Next check
in 3 h

How to call it

POST https://www.mahastrategies.com/api/v1/compute/numerics/unit-uncertainty

Each call costs $0.010006 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/numerics/unit-uncertainty
content-type: application/json

{
  "dataClass": "synthetic",
  "from": "degF",
  "quantity": "absolute",
  "standardUncertainty": "1.8",
  "to": "degC",
  "value": "32"
}

Parameters

ParameterTypeRequiredDescription
dataClassstringYes One of: public, synthetic.
fromstringYes One of: m, cm, mm, km, kg, g, s, min, h, K, degC, degF.
quantitystringYes One of: absolute, difference.
standardUncertaintystringYes
tostringYes One of: m, cm, mm, km, kg, g, s, min, h, K, degC, degF.
valuestringYes

Example response

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

Example response, 39 lines
{
  "data": {
    "chargedAmount": "10006",
    "inputHash": "sha256:b3a587fdac867bb3cf6caab696c9ddbaf2c5c40eb06eb44e5ff8d1611…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "unit-uncertainty-conversion",
    "result": {
      "from": "degF",
      "offset": {
        "denominator": "9",
        "numerator": "-160"
      },
      "physicalValidityVerified": false,
      "quantity": "absolute",
      "scale": {
        "denominator": "9",
        "numerator": "5"
      },
      "standardUncertainty": {
        "denominator": "1",
        "numerator": "1"
      },
      "to": "degC",
      "value": {
        "denominator": "1",
        "numerator": "0"
      }
    },
    "resultHash": "sha256:a9b03d44714b95203be77799f631afb988073bf00e003127baa7165e5…",
    "sourceContractAmount": "8000",
    "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 $0.010006.

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/numerics/unit-uncertainty' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","from":"degF","quantity":"absolute","standardUncertainty":"1.8","to":"degC","value":"32"}'

# 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/numerics/unit-uncertainty' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","from":"degF","quantity":"absolute","standardUncertainty":"1.8","to":"degC","value":"32"}' \
  | 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 $0.010006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.010006" });
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 $0.010006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fnumerics%2Funit-uncertainty&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/numerics/unit-uncertainty", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "from": "degF",
    "quantity": "absolute",
    "standardUncertainty": "1.8",
    "to": "degC",
    "value": "32"
  }),
});
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 $0.010006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.010006"})
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/numerics/unit-uncertainty",
        json={
            "dataClass": "synthetic",
            "from": "degF",
            "quantity": "absolute",
            "standardUncertainty": "1.8",
            "to": "degC",
            "value": "32",
        },
    )
    print(res.status_code, res.text)

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Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402179 ms$0.01