$0.001
per call · USD Coin on Base
Cheapest end-to-end x402 purchase test. Always returns a 402 challenge without payment and the current full NegPrice decision after a valid USDC payment.
Endpoint
GET https://energy.halowerk.com/demo/paid-sample4
Calls / 30d
3
Unique payers / 30d
Sep 8
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://energy.halowerk.com/demo/paid-sample", {
method: "GET",
});
const data = await res.json();curl -X GET \
"https://energy.halowerk.com/demo/paid-sample" \
-H "X-PAYMENT: <signed x402 payment>"Example response
{
"endpoint": "/demo/paid-sample",
"ok": true,
"paid": true,
"result": {
"expires_at": "2026-07-12T13:00:00.000Z",
"schema_version": "negprice_signal_v1"
}
}Payment details
0x2880edfff13100677bf97a3cbdf3bc34771c4e5eUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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