Freebitco.in Script

// Customizable variables
var minValue = 0.00000001;
var maxLoss = 0.0000001;
var aimedProfit = 0.000005;
var maxOps = 50;

// Don't touch anything after this
var endResult = 0;
var ops = 0;

// Bets a given amount on a given button and returns the value ot the callback
var bet = function(value, button, callback) {
	var buttonName = button ? 'lo' : 'hi';
	// We use site's api
	$.get('?op=double_your_btc&m=' + buttonName + '&stake=' + value + '&multiplier=2&jackpot=0', function(result) {
			var splittedResult = result.split(':');
			// We update the account balance, as we have it juste there
			$('#balance').html(splittedResult[3]);
			// We finally call the callback
			callback(value, button, splittedResult[1] === 'w');
		}
	);
};

// Main Martingale's method
var martingale = function(value, button, result) {
	// We apply Martingale algorithm
	if (result || (value >= maxLoss && maxLoss !== 0)) {
		button = !button;
		newValue = minValue;
	}
	else
		newValue = 2 * value;
	// We compute new final result
	if (result)
		endResult += value;
	else
		endResult -= value;
	// We start over (and log misc data)
	console.log((result ? '+' : '-') + value);
	ops++;
	if ((ops < maxOps || maxOps === 0) && (endResult < aimedProfit || aimedProfit === 0))
		bet(newValue, button, martingale);
	else {
		console.log('Martingale finished in ' + ops + ' operations!');
		console.log('Result: ' + endResult);
	}
};

// Init operation
martingale(minValue, false, false);