Btc Fees

{
  "btcUsd": 83345.495,
  "checkedAt": "2026-10-14T07:00:19.757Z",
  "disclaimer": "Information only, not financial advice.",
  "feesSatPerVbyte": {
    "economy": 1,
    "fastest": 2,
    "halfHour": 1,
    "hour": 1,
    "minimum": 1
  },
  "mempool": {
    "totalFeesBtc": 0.069,
    "transactions": 81442,
    "vsizeMvB": 39.76
  },
  "source": "https://mempool.space/api/v1/fees/recommended, https://mempool.space/api/mempool; USD from Coinbase spot",
  "typicalTransaction": {
    "atEconomy": {
      "btc": 0.0000014,
      "sats": 140,
      "usd": 0.1167
    },
    "atFastest": {
      "btc": 0.0000028,
      "sats": 280,
      "usd": 0.2334
    },
    "vbytes": 140
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/btc/fees'

# 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://api.sitecheck-api.workers.dev/api/btc/fees' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fbtc%2Ffees
const res = await pay("https://api.sitecheck-api.workers.dev/api/btc/fees");
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.sitecheck-api.workers.dev/api/btc/fees")
    print(res.status_code, res.text)