Kickbox vs mail.tm

Kickbox's free, keyless Open API endpoint answers a single question — whether an email domain is disposable — a common building block for lightweight signup-form validation. It's a separate, fully free offering from Kickbox's metered full verification product, which is where catch-all (accept-all) detection lives; a live probe found no catch-all surface on the open endpoint at all.

mail.tm issues disposable inboxes on shared domains and exposes a Hydra/JSON-LD REST API to create accounts, fetch a bearer token, and read incoming messages, all without any signup fee. It's the fully free, actively maintained sibling of mail.gw.