How much would you pay to synchronize your payments with Mailchimp?

Hi. In helping my wife with one of her work projects, I realized that there would be a lot of value to integrating the niche payment platform they’re using with Mailchimp’s e-commerce API.

So, given that most of us could build it ourselves anyway, how much would this kind of integration be worth to you?

$5/month?
$50/month?
$0.10/transaction?
$0.01/transaction?

More background: A typical organization is probably doing $10k - $100k/year on the platform, with some large ones doing much, much more. Typically they don’t have someone who can solve the problem in house OR if they do, that person has higher priority tasks. (i.e. these are not tech companies.)

The platform does integrate with a couple (expensive) niche, industry-specific CRMs.

Obviously, once a service was built one could expand to other payment platforms and other email and CRM platforms.

Thanks,