“Yes — Mailchimp has a real, production-grade developer API, and it supports RSS-to-newsletter automation.”
“Mailchimp has a substantial REST API that supports:”
“It also explicitly supports RSS campaigns through its API.”
“More sophisticated marketing segmentation.”
“RSS automations send at most once daily.”
“The built-in RSS automation is schedule-oriented rather than an instant, fully customizable event pipeline.”
“Mailchimp's API supports RSS campaign creation, but don't assume every aspect of its built-in RSS automation can be configured and controlled through the API.”
“Buttondown also has both, but I'd lean toward Buttondown for a genuinely programmatic newsletter workflow.”
“Buttondown is particularly interesting if you want to treat your newsletter as something your own software controls.”
“Its API is available on all plans, including the free plan.”
“Buttondown supports external RSS feed automations with two actions:”
“Create an email as a draft for manual approval.”
“It doesn't provide official SDKs, but publishes an OpenAPI specification.”