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But extremely cheap compared to the markets they're targeting. SMS is expensive in countries outside of the US, and that's why WhatsApp is so widely used.

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Is it cheaper than the same functionality in WhatsApp's business API?

https://developers.facebook.com/docs/whatsapp/api/messages

Unknown, it's not currently public pricing afaict. Probably behind an NDA or variable,

$0.0135 per message is for messages to US numbers only. E.g. price to Belgium is a whooping $0.1010 per message.

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