What is the WhatsApp Business API?
The plain explanation, including what Meta now calls it and what it costs
It is not an app. The WhatsApp Business app on a phone is a separate, free product for small businesses answering messages by hand. The API is a connection between WhatsApp and your own software — your CRM, your e-commerce platform, your booking system — so messages can be sent and answered automatically, by several people at once, at volume.
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Quick answer
The WhatsApp Business API is the official way for a company to send and receive WhatsApp messages from its own software, rather than by hand from a phone. Meta now calls it the WhatsApp Business Platform, and the interface itself the Meta Cloud API; all three names mean the same product. It is priced per 24-hour conversation rather than per message, requires Meta Business verification and template approval before sending, and requires the recipient to have opted in to marketing messages.
Three rules shape everything about using it.
**Pricing is per conversation.** A conversation is a 24-hour window with one contact. Inside it you can exchange as many messages as the thread needs for one charge. The rate is set by the recipient's country and the category: marketing, utility, authentication, or service, which is free when the customer starts it.
**Templates need approval.** Any message you send to open a conversation must use a template Meta has reviewed and approved in advance. Approval usually takes minutes to a day, and rejections are normally a category mistake rather than a content problem.
**Opt-in is mandatory for marketing.** Sending marketing templates to people who never opted in spikes your block rate, drops your quality rating, cuts your daily messaging limit and eventually restricts the number. This is the rule that ends most WhatsApp Business accounts, and it is not enforced by a warning first.
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