extrinstic-information.ts

import { ApiPromise, Keyring, WsProvider } from "@polkadot/api";

async function main() {

	const wsProvider = new WsProvider("wss://rpc.parallel.fi");
	const api = await ApiPromise.create({ provider: wsProvider });

	// no blockHash is specified, so we retrieve the latest
	const signedBlock = await api.rpc.chain.getBlock();

	// the information for each of the contained extrinsics
	signedBlock.block.extrinsics.forEach((ex, index) => {
	  // the extrinsics are decoded by the API, human-like view
	  console.log(`index: ${index}`);
	  console.log(ex.toHuman());
	});

}

// run
main()
	.catch(console.error)
	.finally(() => process.exit());

get-balance.ts

import { ApiPromise, Keyring, WsProvider } from "@polkadot/api";

async function main() {

	const wsProvider = new WsProvider("wss://rpc.parallel.fi");
	const api = await ApiPromise.create({ provider: wsProvider });

	const ADDR = 'p8FhJ2kCvAtetismfbfgLBeGwBknFuqT77L9nJXdLTvct35HD';

	// Retrieve the last timestamp
	const now = await api.query.timestamp.now();

	// Retrieve the account balance & nonce via the system module
	const result: any = await api.query.system.account(ADDR);

	const nonce = result.nonce;
	const free = result.data.free / 1e12;

	console.log(`${now}: balance of ${free} and a nonce of ${nonce}`);
}

// run
main()
	.catch(console.error)
	.finally(() => process.exit());

get-block.ts

import { ApiPromise, Keyring, WsProvider } from "@polkadot/api";

async function main() {

	const wsProvider = new WsProvider("wss://rpc.parallel.fi");
	const api = await ApiPromise.create({ provider: wsProvider });

	// Retrieve the latest header
	const lastHeader = await api.rpc.chain.getHeader();

	// fetch last block using the last block's hash
	const block: any = await api.rpc.chain.getBlock(lastHeader.hash);

	console.log(block)
}

// run
main()
	.catch(console.error)
	.finally(() => process.exit());