Radio Callsign
by Saylor Innovations Data Desk in Developer tools
US amateur radio callsign lookup - licence class, status, grant and expiry dates, licensee name and grid square from the FCC database
https://saylorinnovations.com/api/radio/callsign/:call- Price
- $0.01
- per call in USDC
- Uptime
- 0.0%
- last 30 days
- Response time
- -
- no timed checks yet
- Last check
- Failed
- 3 h ago, next any minute now
Reliability
Latest check failed 3 h ago: Expected HTTP 402, got 400
Status and outage history · Atom feed · Watch with other listings
How to call it
GET https://saylorinnovations.com/api/radio/callsign/:call
Each call costs $0.01 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
The listing has no example input.
GET https://saylorinnovations.com/api/radio/callsign/:callExample response
The provider's example. We can't check it without paying.
{
"callsign": "W1AW",
"city": "NEWINGTON",
"expiry_date": "02/26/2031",
"frn": "0004511143",
"grant_date": "12/08/2020",
"grid_square": "FN31pr",
"last_action_date": "03/12/2026",
"licence_type": "CLUB",
"licensee": "ARRL HQ OPERATORS CLUB",
"note": "US FCC amateur radio licence record (public). Street address is not returned.",
"operator_class": null,
"previous_callsign": null,
"source": "FCC Universal Licensing System via callook.info",
"state": "CT",
"status": "valid",
"trustee": "NA2AA",
"trustee_name": "Minster, David A",
"uls_url": "https://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=780866",
"zip": "06111"
}Call it from code
The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.
curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/radio/callsign/:call'
# 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://saylorinnovations.com/api/radio/callsign/:call' \
| grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decodeJavaScript: 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fradio%2Fcallsign%2F%3Acall
const res = await pay("https://saylorinnovations.com/api/radio/callsign/:call");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))
with x402_requests(client) as session:
res = session.get("https://saylorinnovations.com/api/radio/callsign/:call")
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
| When | Result | HTTP | Time | Price |
|---|---|---|---|---|
| 3 h ago | Expected HTTP 402, got 400 | 400 | 812 ms | - |
| 7 h ago | Expected HTTP 402, got 400 | 400 | 209 ms | - |
| 12 h ago | Expected HTTP 402, got 400 | 400 | 194 ms | - |