ToolVet
32trust / 100

Polygon Area

by Land Survey Screening in Weather & location

x402 APIFailing, checked 22 h ago

Area in acres, hectares and square meters and perimeter of a polygon from lat,lon vertices, e.g. a parcel or flight area.

GET
https://land-survey.x402tookit.com/polygon-area
Price
$0.02
per call in USDC
Uptime
50.0%
last 30 days
Response time
520 ms
670 ms slowest 5%
Last check
Failed
22 h ago, next in 2 h

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 22 h ago: Expected HTTP 402, got 530

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://land-survey.x402tookit.com/polygon-area

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://land-survey.x402tookit.com/polygon-area?points=39.7400%2C-104.9900%3B39.7400%2C-104.9850%3B39.7360%2C-104.9850%3B39.7360%2C-104.9900

Parameters

ParameterTypeRequiredDescription
pointsstringYesVertices as lat,lon pairs separated by semicolons, 3 to 40 points

Example response

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

{
  "acres": 46.989,
  "asOf": "2026-10-11T03:48:09.166Z",
  "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.",
  "hectares": 19.0158,
  "notChecked": [
    "self-intersecting polygons (area is then meaningless)",
    "legal boundaries or survey-grade accuracy (spherical model, error well under 1% for parcels)",
    "…1 more"
  ],
  "perimeterFeet": 5723.8,
  "perimeterMeters": 1744.6,
  "reasons": [
    "Area on a spherical Earth from the vertices in order; the polygon closes automatically."
  ],
  "source": "computed locally",
  "squareFeet": 2046839.8,
  "squareMeters": 190157.6,
  "summary": "46.989 acres (19.016 ha) with a perimeter of 1744.6 m.",
  "verdict": "COMPUTED",
  "vertices": 4
}

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://land-survey.x402tookit.com/polygon-area?points=39.7400%2C-104.9900%3B39.7400%2C-104.9850%3B39.7360%2C-104.9850%3B39.7360%2C-104.9900'

# 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://land-survey.x402tookit.com/polygon-area?points=39.7400%2C-104.9900%3B39.7400%2C-104.9850%3B39.7360%2C-104.9850%3B39.7360%2C-104.9900' \
  | 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%2Fland-survey.x402tookit.com%2Fpolygon-area
const res = await pay("https://land-survey.x402tookit.com/polygon-area?points=39.7400%2C-104.9900%3B39.7400%2C-104.9850%3B39.7360%2C-104.9850%3B39.7360%2C-104.9900");
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://land-survey.x402tookit.com/polygon-area?points=39.7400%2C-104.9900%3B39.7400%2C-104.9850%3B39.7360%2C-104.9850%3B39.7360%2C-104.9900")
    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
22 h agoExpected HTTP 402, got 530530111 ms-
2 days agoExpected HTTP 402, got 530530121 ms-
3 days agoExpected HTTP 402, got 530530106 ms-
5 days agoExpected HTTP 402, got 530530100 ms-
5 days agoExpected HTTP 402, got 53053091 ms-
Show 9 older checks
5 days agoExpected HTTP 402, got 530530175 ms-
5 days agoExpected HTTP 402, got 530530164 ms-
5 days agoPassed402549 ms$0.02
5 days agoPassed402527 ms$0.02
6 days agoPassed402340 ms$0.02
6 days agoPassed402520 ms$0.02
6 days agoPassed402508 ms$0.02
6 days agoPassed402247 ms$0.02
7 days agoPassed402670 ms$0.02