Google Ads - Basic Budget Checker Script 

Set to run hourly. Customize items in YELLOW. Works for all Search campaigns.

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function main() {

  var targetBudget = 5500;	// Change to target budget

  var MTDCost;

  var safeBudget;

  var campaignIterator;

  var campaignsPaused = false;

  // Get MTD spend & target budget

  MTDCost = getMTDCost();

  safeBudget = targetBudget - 40; // Change to amount "under" target budget since script runs hourly

  // Pause if budget exceeds safe budget

  if(MTDCost >= safeBudget) {

    campaignIterator = AdsApp.campaigns().get();

    while(campaignIterator.hasNext()) {

      var currentCampaign = campaignIterator.next();

      if(!currentCampaign.isPaused()) {

        currentCampaign.pause();

        campaignsPaused = true;

      }

    } 

  } // end if

  if(campaignsPaused == true) {

    MailApp.sendEmail('youremail@yourdomain.com', AdsApp.currentAccount().getName() + ' monthly budget met, all campaigns paused.', 'See subject line.');

  }

}

// -------------------------------------------------------------

function getMTDCost () {

  var campaignIterator = AdsApp.campaigns().get();

  var MTDCost = 0;

  while(campaignIterator.hasNext()) {

    MTDCost += campaignIterator.next().getStatsFor("THIS_MONTH").getCost();

  }

  return MTDCost;

} // end getMTDCost

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