If **every **call needed to use your calendar tool in Make that would be 21,000 credits per month. On the Make Core plan with 40K credits that's $29/mo . 20K credits is $16/mo. If that's eating your profits you might need to take a look at your business plan 😉 Seriously though, if you know your conversion ratio from a calendar booking to a billable outcome then you can work out how much a calendar booking is worth. On the Make Core plan with 20K credits, at 21 credits per calendar booking that's 1.68c per calendar booking. I'd aim for a 10:1 ROI, so if a calendar booking is worth more than 16.8c then it's worth it. If not, then I'd either find an alternative solution for GCal integration or target my outbound audience more carefully.