That's what webmention.io is for. It'll receive webmentions on your behalf and then expose an API to pull em down. You hit that API during your static site bu

That's what webmention.io is for. It'll receive webmentions on your behalf and then expose an API to pull em down. You hit that API during your static site build or do it dynamically with some client side JS. Either way it allows you to avoid hosting any services yourself.