ToolVet
34trust / 100

Maidenhead

by Radio & RF Calc in Weather & location

x402 APIFailing, checked 27 h ago

Convert latitude/longitude to a Maidenhead grid locator (4, 6 or 8 characters) or a locator to its centre and bounds.

GET
https://radio-calc.x402tookit.com/maidenhead
Price
$0.02
per call in USDC
Uptime
56.3%
last 30 days
Response time
520 ms
572 ms slowest 5%
Last check
Failed
27 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 27 h ago: Expected HTTP 402, got 530

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

How to call it

GET https://radio-calc.x402tookit.com/maidenhead

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://radio-calc.x402tookit.com/maidenhead?characters=6&latitude=48.1458&longitude=11.625

Parameters

ParameterTypeRequiredDescription
charactersintegerNoLocator length to produce: 4, 6 (default) or 8
latitudenumberNoLatitude -90 to 90 (with longitude, to get a locator)
locatorstringNoA locator such as JN58 or JN58td, to get its centre and bounds
longitudenumberNoLongitude -180 to 180

Example response

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

{
  "asOf": "2026-10-12T00:54:04.759Z",
  "characters": 6,
  "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.",
  "fourCharacter": "JN58",
  "locator": "JN58td",
  "notChecked": [
    "datum differences (WGS84 assumed)",
    "the 10-character extended locators used by some software"
  ],
  "reasons": [],
  "sixCharacter": "JN58td",
  "source": "computed locally (IARU Maidenhead system)",
  "summary": "48.1458, 11.625 is in JN58td.",
  "verdict": "LOCATOR"
}

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://radio-calc.x402tookit.com/maidenhead?characters=6&latitude=48.1458&longitude=11.625'

# 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://radio-calc.x402tookit.com/maidenhead?characters=6&latitude=48.1458&longitude=11.625' \
  | 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%2Fradio-calc.x402tookit.com%2Fmaidenhead
const res = await pay("https://radio-calc.x402tookit.com/maidenhead?characters=6&latitude=48.1458&longitude=11.625");
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://radio-calc.x402tookit.com/maidenhead?characters=6&latitude=48.1458&longitude=11.625")
    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
27 h agoExpected HTTP 402, got 530530138 ms-
39 h agoExpected HTTP 402, got 530530118 ms-
2 days agoExpected HTTP 402, got 530530118 ms-
3 days agoPassed402572 ms$0.02
3 days agoExpected HTTP 402, got 53053099 ms-
Show 10 older checks
3 days agoPassed402520 ms$0.02
5 days agoExpected HTTP 402, got 530530104 ms-
5 days agoExpected HTTP 402, got 530530217 ms-
5 days agoExpected HTTP 402, got 530530179 ms-
5 days agoPassed402565 ms$0.02
6 days agoPassed402515 ms$0.02
6 days agoPassed402559 ms$0.02
6 days agoPassed402526 ms$0.02
6 days agoPassed402489 ms$0.02
6 days agoPassed402490 ms$0.02