SMARD Energy Prices (x402)

Paywalled SMARD day‑ahead electricity prices (DE‑LU, 15‑minute resolution) via x402 on Base mainnet.

Endpoints

GET /prices — HTTP API (x402)
POST /mcp — MCP server (streamable‑http)

Pricing

$0.001 per call (USDC on Base). Requires X-PAYMENT header.

Example (Node.js)

import { createWalletClient, http } from "viem";
import { base } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";
import { createPaymentHeader, selectPaymentRequirements } from "x402/client";

const url = "https://smard-energy-prices-x402.favo.workers.dev/prices";

// 1) Get payment requirements
const res = await fetch(url);
const data = await res.json();
const req = selectPaymentRequirements(data.accepts, "base", "exact");

// 2) Create payment header
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const client = createWalletClient({ account, chain: base, transport: http("https://mainnet.base.org") });
const xPayment = await createPaymentHeader(client, data.x402Version, req);

// 3) Call API with payment
const paid = await fetch(url, { headers: { "X-PAYMENT": xPayment } });
console.log(await paid.json());

MCP Notes

Use Accept: application/json, text/event-stream when calling /mcp.