hapi-mailchimp-simple-subscribe
server.pack.register({ plugin: require("hapi-mailchimp-simple-subscribe"), options: { apiKey: "mailchimp-api-key", listId: "id-of-your-mailchimp-list" }}, { route: { prefix: "/ml" }});And you should be able to do a push request to "/ml/subscribe" with "mail=a.mail@you.com".
Cheers!