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Use the Inboxapp API to manage inboxes and messages from your own apps. Full reference: API overview · Quickstart.

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Prerequisites

  • An Inboxapp account
  • An API key from account settings (treat it like a password)
  • Optional: Postman or cURL for testing

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Base URL

https://inboxapp.com/api/v1 Authenticate with a Bearer token using your API key in the Authorization header.

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Common tasks

Follow the official guides for listing inboxes, working with threads, and sending messages: Note: Replying to existing conversations works on all plans. Sending the first message to a new contact needs the outbound/API add-on described in Billing — Plans and credits. Still stuck? Contact support from the app, or email support@inboxapp.com for API issues.