CONFIRMED. Starting October 1, 2026, Meta begins charging for service messages sent inside the 24 hour customer service window on the WhatsApp Business Platform. Until now these replies, whether written by a human agent or generated by automation and AI, were free inside the window. That changes for any company using the official WhatsApp API for customer service.
The rule comes with a safety margin: each business phone number gets an allowance of 1,000 free service messages per month. Once that allowance runs out, every additional reply gets billed per unit, at the rate set by that market's price list. Meta does not publish one global price, the cost varies by country, and the final rate card only came out on September 1.
Another change rounds out the package: utility templates sent inside an already open 24 hour window also become billable starting October 1. Before, only templates sent outside the window carried a fee. That specific exemption now disappears.
What stays free helps size the real impact: messages received from customers are not billed, the 24 hour window mechanic itself remains, and qualifying 72 hour entry point delivery stays exempt. What changes is specifically the outbound reply inside the window, whether written by a person or an AI agent.
The timing is not a coincidence. According to an August Gartner survey, 64% of Brazilian companies with more than 50 employees already use some level of conversational AI on WhatsApp, and the channel has matured into a standard customer service tool for small and midsize companies in the country. For those operations, billing service messages stops being a technical footnote and becomes a recurring cost line that needs to enter the business spreadsheet.
In practice, the impact depends on volume. A small company with occasional support conversations likely stays inside the 1,000 message free allowance per number. A business that automated most of its customer service and answers thousands of conversations a month will feel the bill grow starting in October, especially if it runs several numbers or hits volume spikes during promotional dates.
The practical recommendation is simple: before October, measure how many service messages your operation sends today per phone number, compare that to the free allowance, and simulate the added cost using your market's rate card. Companies that depend on WhatsApp automation for service or sales gain more by reviewing redundant flows now than by discovering a high bill after billing has already started.
Sources
Meta for Developers, official pricing table: https://developers.facebook.com/documentation/business-messaging/whatsapp/pricing
YCloud, independent coverage: https://www.ycloud.com/blog/whatsapp-api-message-pricing-update-effective-october-1-2026
Landbot, independent coverage: https://landbot.io/blog/whatsapp-business-api-pricing-change-october