ToolVet
63trust / 100

Acceleration Estimate

by Automotive Calculators in Other

x402 APIPassing, checked 11 h ago

Estimate quarter-mile time and trap speed from weight and horsepower (Hale), plus a power-limited lower bound for 0-60 mph.

GET
https://automotive-calc.x402tookit.com/acceleration-estimate
Price
$0.02
per call in USDC
Uptime
70.6%
last 30 days
Response time
520 ms
2.7 s slowest 5%
Last check
Passed
11 h ago, next any minute now

Run a free test callHow to call it

Reliability

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How to call it

GET https://automotive-calc.x402tookit.com/acceleration-estimate

Each call costs $0.02 in USDC on Polygon, 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.

GET https://automotive-calc.x402tookit.com/acceleration-estimate?horsepower=300&powerAt=crank&weightLb=3200

Parameters

ParameterTypeRequiredDescription
drivetrainLossPercentnumberNoLoss between crank and wheels in % (default 15), used for the 0-60 bound
horsepowernumberYesEngine power in horsepower, 10 to 5000
powerAtstringNocrank (default) or wheel: where the horsepower figure was measured
weightLbnumberYesWeight with driver in pounds, 500 to 20000

Example response

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

{
  "asOf": "2026-10-11T14:38:36.356Z",
  "crankHorsepower": 300,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "notChecked": [
    "traction, launch technique, gearing, shift time, air density and altitude, tire type and road surface: real times scatter around these estimates by half a second or more",
    "that Hale's formulas fit rear-drive production cars best: all-wheel drive and electric cars launch harder than power alone predicts",
    "…2 more"
  ],
  "poundsPerHorsepower": 10.67,
  "powerToWeightHpPerTon": 187.5,
  "quarterMileSeconds": 12.82,
  "reasons": [
    "Hale: ET = 5.825 x (weight / hp)^(1/3) seconds and trap speed = 234 x (hp / weight)^(1/3) mph, with weight in pounds and crank horsepower.",
    "0-60 lower bound = kinetic energy at 60 mph / wheel power: it ignores drag, shifts and traction."
  ],
  "source": "computed locally",
  "summary": "3200 lb with 300 hp (crank): about 12.82 s and 106 mph in the quarter mile. Power alone would allow 0-60 mph in no less than 2.7 s; real times are longer.",
  "trapSpeedMph": 106.3,
  "verdict": "ESTIMATED",
  "weightLb": 3200,
  "wheelHorsepower": 255,
  "zeroToSixtyPowerLimitedLowerBoundSeconds": 2.75
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://automotive-calc.x402tookit.com/acceleration-estimate?horsepower=300&powerAt=crank&weightLb=3200'

# 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 - 'https://automotive-calc.x402tookit.com/acceleration-estimate?horsepower=300&powerAt=crank&weightLb=3200' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fautomotive-calc.x402tookit.com%2Facceleration-estimate
const res = await pay("https://automotive-calc.x402tookit.com/acceleration-estimate?horsepower=300&powerAt=crank&weightLb=3200");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://automotive-calc.x402tookit.com/acceleration-estimate?horsepower=300&powerAt=crank&weightLb=3200")
    print(res.status_code, res.text)

Security scan

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Recent checks

WhenResultHTTPTimePrice
11 h agoPassed402562 ms$0.02
24 h agoExpected HTTP 402, got 53053033 ms-
36 h agoPassed402565 ms$0.02
2 days agoExpected HTTP 402, got 530530110 ms-
2 days agoPassed402520 ms$0.02
Show 10 older checks
3 days agoPassed402571 ms$0.02
3 days agoPassed402542 ms$0.02
5 days agoExpected HTTP 402, got 53053090 ms-
5 days agoExpected HTTP 402, got 530530211 ms-
5 days agoExpected HTTP 402, got 530530165 ms-
5 days agoPassed402520 ms$0.02
5 days agoPassed402506 ms$0.02
6 days agoPassed4022.7 s$0.02
6 days agoPassed402533 ms$0.02
6 days agoPassed402487 ms$0.02