India has roughly 615 million WhatsApp users and about 15 million active WhatsApp Business accounts. For a very large number of small traders, clinics, coaching centres and D2C brands, WhatsApp is not a marketing channel they added. It is the shopfront, the order book and the customer service desk, all running through one phone.
That works until it doesn’t. One phone, one person holding it, and a business that has outgrown both. The answer most businesses eventually reach is the WhatsApp Business API — the official route that lets a whole team work from a single number, send bulk updates, and automate the repetitive replies.
What almost nobody explains properly is what it costs. Not because the information is secret, but because it arrives in two separate bills, and most providers are loud about the smaller one.
Two bills, not one
The first bill comes from Meta, and it is charged per message.
On 1 July 2025, Meta replaced its older conversation-based pricing with a per-message model. Every template message you send is now billed individually, at a rate that depends on the recipient’s country and the category of the message.
There are four categories, and the difference between them is where most of the confusion lives:
| Category | What it is | Billed? |
|---|---|---|
| Service | Your reply to a customer who messaged you first | Free (for now) |
| Utility | Order, delivery, booking and account updates | Yes |
| Marketing | Offers, launches, re-engagement | Yes — the most expensive |
| Authentication | One-time passcodes | Yes |
Inside that sits the single most useful rule in the whole system: the 24-hour customer service window.
When a customer messages your business, a 24-hour window opens. Inside it, you can reply as many times as you like, in free-form text, and — until now — those replies cost nothing.
The practical consequence is significant. A business that mostly answers questions can run on WhatsApp for very little. A business that mostly pushes offers pays for every send. Two shops on the same platform, with the same number of messages, can have wildly different bills depending only on who started the conversation.
What is reported to change on 1 October 2026
According to industry reports, from 1 October 2026 those free-form replies inside the 24-hour window become billable as well.
If that lands as described, the businesses most affected are precisely the ones that have been getting the best deal: clinics answering appointment queries, service centres handling complaints, coaching institutes fielding admission questions, and any retailer whose customers ask a lot before they buy. Their bill has effectively been near zero for inbound-heavy work. That changes.
This has not been announced by Meta in the form most businesses would recognise, and rates and rules in this area have moved more than once. Anyone building a budget on it should check Meta’s own current pricing documentation before committing. But it is worth knowing that the ground may be about to shift, rather than discovering it on an invoice.
The second bill — and the question that reveals it
The WhatsApp Business API is not something you log into. It is an interface. To actually use it you need software on top: a shared inbox, broadcast tools, automation, reporting. That software is what platform companies sell, and it is billed monthly.
In India those monthly fees currently run from roughly ₹999 to about ₹3,500, depending on the provider and the tier. AiSensy publishes plans at approximately ₹999, ₹2,399 and ₹3,599 per month. Interakt bills quarterly at ₹3,499, ₹7,699 and ₹10,499. Wati offers a pay-as-you-go entry at ₹999 for 500 message credits over three months. DoubleTick runs roughly ₹1,200 to ₹5,000. Newer entrants, including QuickWA, price from ₹999 with a free tier.
So far, so comparable. Here is the part that is not on the pricing page.
Some platforms add their own margin on top of Meta’s per-message rate. Wati is reported to add roughly 20 per cent per message. Others pass Meta’s rate through at cost and take nothing.
That difference does not show up in a plan comparison, and it grows in exactly the way a subscription does not — with your success.
Consider a business sending 50,000 marketing messages in a month. The subscription is fixed. The margin is not. At a typical marketing rate, a 20 per cent markup on that volume can comfortably exceed the entire monthly subscription it is attached to. Double your list next year and the subscription stays flat while the markup doubles.
Which produces the single most valuable question a business can ask before signing anything:
“Do you add any markup to Meta’s per-message rate, and if so, how much?”
Ask it in writing. Providers who pass through at cost will answer immediately and clearly, because it is a selling point for them. Providers who do not will often reframe the question. Both responses tell you what you need to know.
The 250-message wall
There is one more number that catches businesses out, and it catches them at the worst possible moment.
A newly registered WhatsApp API number can only start conversations with 250 unique customers in a rolling 24-hour period.
Meta places every new number on this starting tier. As your volume holds up and your quality rating stays healthy, the ceiling rises automatically: 250, then 1,000, then 10,000, then 100,000, then unlimited.
The failure mode is predictable and entirely avoidable. A brand plans a festival campaign to 10,000 customers, registers the number a few days before, schedules the broadcast — and it does not send. There is no support ticket that fixes this. The ramp takes time.
Two related points are worth knowing. First, replies inside an open 24-hour window do not count against this limit, so a support-heavy number can talk to far more than 250 people a day. Second, the tier moves in both directions: if customers block, mute or report your messages, your quality rating drops and the ceiling can come down rather than up.
The lesson for anyone planning seasonal campaigns is simply to start early. Register the number weeks ahead, send genuinely useful messages to a warm audience, let the tier climb, and arrive at the festival with headroom.
Who owns your number
One question gets skipped in almost every evaluation, and it only becomes important at the worst time — when a business wants to leave.
Your WhatsApp Business Account should sit inside your own Meta Business Manager, with the provider given access to it. The alternative — where the number lives inside the provider’s account and you are a guest on it — means changing platforms involves negotiating for something that should already be yours.
Ask directly: “If I leave in a year, does the number and its message history come with me, and whose Meta account is it registered under?” The answer is worth more than several features.
A practical checklist
For any business weighing this up, five checks cover most of the risk:
Model your own message mix first. Count how many of your messages are replies to customers versus outbound promotions. That ratio, not the headline price, determines your real bill — and it is about to matter more if the October change lands as reported.
Get the markup answer in writing. One question, potentially the largest line item in your costs.
Check the agent count on the plan you would actually buy, not the tier above it. Per-seat limits are the most common reason a business ends up on a more expensive plan than it planned.
Confirm the account ownership. Your number, your Meta Business Manager.
Test before you pay. Use a free plan or a trial. A provider offering neither is telling you something.
The bigger picture
None of this argues against WhatsApp. With 615 million users in India, it is not a channel a consumer business can reasonably ignore, and the economics are still favourable compared with almost anything else that reaches a customer directly.
But the market has matured past the point where “we’re on WhatsApp” is a strategy. The businesses getting real value from it are the ones treating it as infrastructure — understanding what they are billed for, planning their sending capacity in advance, and knowing exactly who owns the number their customers message.
That is a less exciting conversation than growth-hacking a broadcast list. It is also the one that decides whether the channel makes money or quietly costs more than it should.
