Airport Nearest

{
  "airports": [
    {
      "distance_m": 13197,
      "duration_s": 1020,
      "iata": "LAL",
      "icao": "KLAL",
      "lat": 27.989267,
      "lon": -82.020715,
      "miles": 8.2,
      "minutes": 17,
      "municipality": "Lakeland",
      "name": "Lakeland Linder International Airport",
      "type": "medium_airport"
    },
    {
      "distance_m": 67913,
      "duration_s": 3780,
      "iata": "TPA",
      "icao": "KTPA",
      "lat": 27.9755,
      "lon": -82.533203,
      "miles": 42.2,
      "minutes": 63,
      "municipality": "Tampa",
      "name": "Tampa International Airport",
      "type": "large_airport"
    }
  ],
  "airports_data_as_of": "2026-09-19T03:23:00Z",
  "attribution": "© OpenStreetMap contributors | © openrouteservice.org by HeiGIT | Airport data: OurAirports (public domain)",
  "origin": {
    "confidence": 0.95,
    "kind": "address",
    "lat": 28.0395,
    "lon": -81.9498,
    "name": "Lakeland, Florida, United States",
    "source": "photon"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.flipvo.com/v1/airport/nearest' \
  -H 'content-type: application/json' \
  --data-raw '{"k":3,"location":"Lakeland, FL"}'

# 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://api.flipvo.com/v1/airport/nearest' \
  -H 'content-type: application/json' \
  --data-raw '{"k":3,"location":"Lakeland, FL"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fapi.flipvo.com%2Fv1%2Fairport%2Fnearest&method=POST
const res = await pay("https://api.flipvo.com/v1/airport/nearest", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "k": 3,
    "location": "Lakeland, FL"
  }),
});
console.log(res.status, await res.text());

# 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.post(
        "https://api.flipvo.com/v1/airport/nearest",
        json={
            "k": 3,
            "location": "Lakeland, FL",
        },
    )
    print(res.status_code, res.text)