Luno.com "Dollar Cost Avg" daily buy script for BTC & ETH

btc-eth-luno-buy.php

<?php
/**
 * Buy BTC & ETH daily on Luno.com
 * @author Gerhard Potgieter <[email protected]>
 * @since 2017-12-07
 * https://www.luno.com/invite/JN5Z4
 * 
 * This script will do a daily purchase of BTC and ETH on Luno.com based on rand value (ZAR) set. Default to R100 each. Why daily? https://en.wikipedia.org/wiki/Dollar_cost_averaging
 * 
 * Installation Instructions
 * Add to Crontab:
 * @daily php btc-eth-luno-buy.php
 * 
 * Fill in the $key_id, $key_secret variables as obtained from your Luno account, enter the values you would like to purchase daily in ZAR.
 */

// Generate API Keys on Luno @ https://www.luno.com/wallet/settings/api_keys Be sure to select trading permission level.
$key_id = 'YOUR_ID';
$key_secret = 'YOUR_SECRET';

// ZAR values to buy. Luno minumum is 10 ZAR.
$btc_in_zar = 0;
$eth_in_zar = 0;

// Auth headers.
$auth_headers = stream_context_create( array(
	'http' => array(
		'header'  => "Authorization: Basic " . base64_encode( $key_id . ':' . $key_secret ),
	),
) );


/**
 * Account balances.
 */
echo "Fetching Luno account balances...\n";
$url = 'https://api.mybitx.com/api/1/balance';
$reply = json_decode( file_get_contents( $url, false, $auth_headers ), true );
$eth_balance = 0;
$xbt_balance = 0;
$zar_balance = 0;
if ( is_array( $reply ) && isset( $reply['balance'] ) ) {
	foreach ( $reply['balance'] as $balance ) {
		${strtolower( $balance['asset'] ) . '_balance'} = $balance['balance'];
		echo $balance['asset'] . ': ' . $balance['balance'] . "\n";
	}
} else {
	echo "Failed to fetch account balances.\nQuiting...\n";
	exit;
}

/**
 * Account balance check, make sure there is enought ZAR to buy.
 */
if ( $zar_balance < ( $btc_in_zar + $eth_in_zar ) ) {
	echo "You do not have enought ZAR in your Luno account to purchase BTC & ETH.\nQuitting...";
	exit;
}


/**
 * BTC Purchasing. Minimum is 10 ZAR.
 */
if ( 10 <= $btc_in_zar ) {
	// Get BTC Price.
	echo "Getting BTC price from Luno...\n";

	$url = 'https://api.mybitx.com/api/1/ticker?pair=XBTZAR';
	$reply = json_decode( file_get_contents( $url ), true );

	$btc_price = $reply['ask'];
	echo "BTC Price: ZAR " . $btc_price . "\n";

	// Create a quote on Luno
	$postdata = http_build_query(
		array(
			'type' => 'SELL',
			'base_amount' => $btc_in_zar,
			'pair' => 'ZARXBT'
		)
	);
	$options = array( 'http' =>
		array(
			'method'  => 'POST',
			'header'  => "Authorization: Basic " . base64_encode( $key_id . ':' . $key_secret ) . "\nContent-type: application/x-www-form-urlencoded",
			'content' => $postdata
		)
	);
	$context = stream_context_create( $options );
	$url = 'https://api.mybitx.com/api/1/quotes';
	$reply = json_decode( file_get_contents( $url, false, $context ), true );
	if ( is_array( $reply ) && isset( $reply['id'] ) ) {
		$quote_id = $reply['id'];
		echo "Purchasing " . $reply['counter_amount'] . "BTC for " . $btc_in_zar . "\n";
		
		// Exercise quote
		$options = array( 'http' =>
			array(
				'method'  => 'PUT',
				'header'  => "Authorization: Basic " . base64_encode( $key_id . ':' . $key_secret ),
			)
		);
		$context = stream_context_create( $options );
		$url = 'https://api.mybitx.com/api/1/quotes/' . $quote_id;
		$reply = json_decode( file_get_contents( $url, false, $context ), true );
		if ( is_array( $reply ) && isset( $reply['exercised'] ) && 'true' ===  $reply['exercised'] ) {
			echo "Purchase complete, you now own " . $reply['base_amount'] . " more BTC.\n";
		} elseif ( isset( $reply['error'] ) ) {
			echo "Error exercising BTC buy quote: " . $reply['error'] . "\nQuitting...";
			exit;
		} else {
			echo "Something went wrong.\nQuitting...";
			exit;
		}
	} elseif ( is_array( $reply ) && isset( $reply['error'] ) ) {
		echo "Error creating BTC buy quote: " . $reply['error'] . "\nQuitting...";
		exit;
	} else {
		echo "Something went wrong.\nQuitting...";
		exit;
	}
}

/**
 * ETH Purchasing. Minimum is 10 ZAR.
 */
if ( 10 <= $eth_in_zar ) {
	// Get ETH Price.
	echo "Getting ETH price from Luno...\n";

	$url = 'https://api.mybitx.com/api/1/ticker?pair=ETHZAR';
	$reply = json_decode( file_get_contents( $url ), true );

	$eth_price = $reply['ask'];
	echo "ETH Price: ZAR " . $eth_price . "\n";

	// Create a quote on Luno
	$postdata = http_build_query(
		array(
			'type' => 'SELL',
			'base_amount' => $eth_in_zar,
			'pair' => 'ZARETH'
		)
	);
	$options = array( 'http' =>
		array(
			'method'  => 'POST',
			'header'  => "Authorization: Basic " . base64_encode( $key_id . ':' . $key_secret ) . "\nContent-type: application/x-www-form-urlencoded",
			'content' => $postdata
		)
	);
	$context = stream_context_create( $options );
	$url = 'https://api.mybitx.com/api/1/quotes';
	$reply = json_decode( file_get_contents( $url, false, $context ), true );
	if ( is_array( $reply ) && isset( $reply['id'] ) ) {
		$quote_id = $reply['id'];
		echo "Purchasing " . $reply['counter_amount'] . "ETH for " . $btc_in_zar . "\n";
		
		// Exercise quote
		$options = array( 'http' =>
			array(
				'method'  => 'PUT',
				'header'  => "Authorization: Basic " . base64_encode( $key_id . ':' . $key_secret ),
			)
		);
		$context = stream_context_create( $options );
		$url = 'https://api.mybitx.com/api/1/quotes/' . $quote_id;
		$reply = json_decode( file_get_contents( $url, false, $context ), true );
		if ( is_array( $reply ) && isset( $reply['exercised'] ) && 'true' ===  $reply['exercised'] ) {
			echo "Purchase complete, you now own " . $reply['base_amount'] . " more ETH.\n";
		} elseif ( isset( $reply['error'] ) ) {
			echo "Error exercising ETH buy quote: " . $reply['error'] . "\nQuitting...";
			exit;
		} else {
			echo "Something went wrong.\nQuitting...";
			exit;
		}
	} elseif ( is_array( $reply ) && isset( $reply['error'] ) ) {
		echo "Error creating ETH buy quote: " . $reply['error'] . "\nQuitting...";
		exit;
	} else {
		echo "Something went wrong.\nQuitting...";
		exit;
	}
}

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