this post was submitted on 28 Nov 2025
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Privacy
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WhatsApp was originally built on, and still is, a forked version of XMPP. It is nothing like the matrix protocol.
It's not, but they made a WhatsApp API for the DMA. There's a Matrix bridge to WhatsApp.
I understand the DMA interop thing quite well, and it is a private API. The matrix bridge does not use official interop as the Matrix foundation has given up on plans to do interop, as it requires geolocating (and then georestricting) their users.
The current, longstanding, matrix bridge requires you to have the WhatsApp app installed on your phone, with a working account.
From my understanding, this bridge does use some the official WhatsApp web client's API. You only need to connect the official app once in a while (a few seconds every two weeks) and can do so on a separate device.