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Campaigns and marketing

Monthly active contacts (MAC)

Monthly active contacts, usually shortened to MAC, is a billing model that charges according to how many unique contacts a business messaged or heard from during a billing period.

Also calledMACmonthly active contactactive contact pricingcontact-based pricing

Several platforms in this category use some version of it, and the details differ enough to matter: whether an inbound-only contact counts, whether the count resets monthly, and what happens when you exceed it. It is separate from what Meta charges per message. Compare the two parts separately or the comparison will be meaningless.

Worth knowing alongside it.

Per-message pricing
Per-message pricing is Meta's current WhatsApp billing model, which charges for each delivered template message according to its category and the recipient's country.
Conversation-based pricing
Conversation-based pricing was Meta's earlier WhatsApp billing model, which charged for a 24-hour conversation window rather than for each individual message.