Message Exchange Bus (MXB) (Persian: امکان اتصال متقابل) or Interconnection is an Iranian cross-platform instant messaging (IM) technology developed by the Ministry of Information and Communications Technology of Iran.

[1] It enables connection among major Iranian messaging applications, including Bale, Eitaa, Soroush, Rubika, Gap, and iGap.

[2][3] MXB offers a range of functionalities to enhance user experience:[4][5][6] The development of MXB was led by the Ministry of Information and Communications Technology of Iran, aiming to establish a unified messaging ecosystem within Iran.

MXB or interconnection of Iranian messaging apps, enables users of any participating app to communicate with users of other connected platforms.

[7][8] In the second phase, users will be able to participate in groups, channels, and group calls, further enhancing the social and collaborative features of the network.