script to buy bitcoin on coinbase

buy.js

//you will need to install node.js and restler first
//npm install restler

//run with the following command
// node buy.js

var sys = require('util'),
    rest = require('restler');

//set these to your coinbase API key & the amount you want to buy
var apiKey = 'api_key';
var quantity = 10;

var jsonData = { qty: quantity };

function onComplete(data, res) {
  console.log(new Date().toString());
  if (!data.success) {
    console.log( data.errors);
    setTimeout(buy, 5000);
  } else {
    console.log("SUCCESS!");
  }

};

function buy() {
  rest.postJson('https://coinbase.com/api/v1/buys?api_key=' + apiKey, jsonData).on('complete', onComplete);
}

buy();

Not broken per se; you probably ran into that "check this box to buy BTC at a future market price since the 24-hour rolling limit has been hit" situation.