WhatsApp Broadcast Rules Explained: What the Official API Allows

WhatsApp broadcast rules decide who a business may message in bulk, how, and what happens when it breaks the rules. The short version: on the official API you may send marketing templates to customers who have opted in, within Meta's quality limits — and bulk blasting strangers gets numbers restricted or banned. This post explains the rules as they stand, and is explicit about one thing: Neksio is not a bulk or broadcast messaging tool. Our product is one-to-one AI replies in real conversations, and this guide exists so you understand the rules, not so you can blast.

Rule 1: opt-in is mandatory

You may only send marketing templates to customers who have explicitly opted in to receive them — a checkbox at checkout, a keyword reply, a signup form. Purchased lists, scraped numbers, and contacts who merely messaged you once are not opt-ins. Opt-in must be specific to WhatsApp marketing, and customers must be able to opt out easily (a STOP reply must work). No opt-in, no broadcast — that is the whole rule in one line.

Rule 2: broadcasts use approved marketing templates

Broadcast messages on the API are marketing templates, pre-approved by Meta with fixed text and variables. You cannot send free-form bulk messages — free-form only works inside an open 24-hour window with a customer who messaged you. The

templates guide covers categories and approval; the broadcast-specific point is that every bulk send is a template send, billed at the marketing rate per recipient.

Rule 3: quality rating caps your volume

Meta limits how many unique customers a number may message in 24 hours, scaling with the number's quality rating: new numbers start at a low tier and rise as customers engage positively and rarely block or report. High block and report rates drop the rating — and the limit with it. A broadcast that irritates recipients therefore shrinks your future broadcasts. Frequency, relevance, and easy opt-out are not politeness; they are the mechanism that keeps your limit.

What gets numbers banned

Messaging without opt-in, sending bulk messages from unofficial tools or modified apps, ignoring blocks and opt-outs, and deceptive template content are the fastest routes to restriction or a permanent ban. Unofficial bulk-sending tools are a particular trap: they violate WhatsApp's terms outright, and Meta detects them. The official API path with opt-ins and templates is slower to scale — and it is the only path that keeps the number alive.

Business owner: “We bought a list and blasted 5,000 numbers.” The number lasted a week. The business that grew a 500-person opt-in list over six months still messages them today. WhatsApp rewards the slow list and kills the fast one.

Where Neksio fits — and where it doesn't

Neksio is built for the conversation, not the blast: an AI agent that answers customers one-to-one on WhatsApp from your documents, in real time, inside open windows. If your goal is bulk promotional sends, Neksio is the wrong tool — and we say so plainly, because a business that buys an agent expecting a blaster will misuse both. For everything after the customer reaches out — answering, qualifying, supporting, following up — the agent is the workhorse, on the Free plan's 100 AI replies a month on WhatsApp up to Scale at $29.99.