Bitcoin tooling

curl YOUR_CHAINSTACK_ENDPOINT \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"1.0","id":1,"method":"getblockchaininfo","params":[]}'

pip install requests

import requests

ENDPOINT = "YOUR_CHAINSTACK_ENDPOINT"


def rpc(method, params=None):
    response = requests.post(
        ENDPOINT,
        json={"jsonrpc": "1.0", "id": 1, "method": method, "params": params or []},
        timeout=30,
    )
    if "application/json" not in response.headers.get("Content-Type", ""):
        raise RuntimeError(f"HTTP {response.status_code}: {response.text.strip()}")
    body = response.json()
    if body.get("error"):
        raise RuntimeError(body["error"]["message"])
    return body["result"]


info = rpc("getblockchaininfo")
print("Chain:", info["chain"])
print("Blocks:", info["blocks"])

fee = rpc("estimatesmartfee", [6])
if "feerate" in fee:
    print("Fee rate (BTC/kvB):", fee["feerate"])
else:
    mempool = rpc("getmempoolinfo")
    print("No estimate for 6 blocks; minimum fee (BTC/kvB):", mempool["mempoolminfee"])

npm install bitcoinjs-lib ecpair tiny-secp256k1

import * as bitcoin from "bitcoinjs-lib";
import { ECPairFactory } from "ecpair";
import * as ecc from "tiny-secp256k1";

const ENDPOINT = "YOUR_CHAINSTACK_ENDPOINT";

async function rpc(method, params = []) {
  const response = await fetch(ENDPOINT, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ jsonrpc: "1.0", id: 1, method, params }),
    signal: AbortSignal.timeout(30000),
  });
  if (!response.headers.get("content-type")?.includes("application/json")) {
    throw new Error(`HTTP ${response.status}: ${(await response.text()).trim()}`);
  }
  const body = await response.json();
  if (body.error) throw new Error(body.error.message);
  return body.result;
}

const { chain, blocks } = await rpc("getblockchaininfo");
console.log("Chain:", chain, "Blocks:", blocks);

const network = chain === "main" ? bitcoin.networks.bitcoin : bitcoin.networks.testnet;
const ECPair = ECPairFactory(ecc);
const keyPair = ECPair.makeRandom({ network });
const { address } = bitcoin.payments.p2wpkh({ pubkey: keyPair.publicKey, network });
console.log("Address:", address);

const result = await rpc("validateaddress", [address]);
console.log("Valid on", chain + ":", result.isvalid);

const ENDPOINT = "https://HOSTNAME";
const AUTHORIZATION = "Basic " + Buffer.from("USERNAME:PASSWORD").toString("base64");

const response = await fetch(ENDPOINT, {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: AUTHORIZATION },
  body: JSON.stringify({ jsonrpc: "1.0", id: 1, method: "getblockcount", params: [] }),
});
console.log("Blocks:", (await response.json()).result);