WhatsApp AI agents for UK businesses: rules, costs and what to ask

A WhatsApp AI agent answers your customers or guests in the app they already check, at any hour. It can reply to questions, take a booking or confirm who’s coming, then pass the hard cases to your team. It has to work inside Meta’s rules, and those rules shape what it can say and when.

Two of those rules matter most. Since 15 January 2026, Meta’s terms have barred general-purpose AI assistants from the WhatsApp Business Platform in markets like the UK. An agent about your own business is still allowed. And Meta charges per delivered message. In the UK, that’s about 4.6p for a marketing message and 1.6p for most others.

This guide covers what an agent can do, the rules, the costs and the questions to ask before you pay anyone.

What can a WhatsApp AI agent actually do?

An AI agent is software that reads a message, decides what to do, then does it. A chatbot mostly talks. An agent also acts, such as checking a booking, updating a record or handing a chat to a person.

On WhatsApp, a good agent for a 10–250 person business can:

• Answer from your own records. Opening times, order status, what’s included, who’s on the guest list.
• Finish a job in the chat. Confirm an appointment, take an RSVP, collect a missing detail, resend a ticket.
• Reply in a tap. Buttons and lists let people answer without typing.
• Hand over cleanly. Pass the conversation to a named person when it’s out of its depth.
• Work in your name. Messages come from your verified business, not a third-party brand.

What it can’t do matters just as much:

• It can’t message people freely. Outside a 24-hour window after the customer last wrote, you can only send pre-approved templates. More on that below.
• It can’t be a general assistant. Meta’s terms bar an agent whose main job is open-ended AI chat.
• It can’t message people who haven’t opted in. Meta requires opt-in before you start a conversation.
• It can’t know what your systems don’t. If your booking data is wrong, the agent will be confidently wrong too.

The business case is usually speed. A customer who gets a correct answer at 9pm on WhatsApp books then, rather than tomorrow with someone else. Our worked example of AI customer service shows how that plays out with a human check.

Is an AI chatbot allowed on WhatsApp?

Yes, if it serves your business. No, if the AI itself is the product.

Meta’s terms for the WhatsApp Business Platform prohibit “AI Providers” from using it. That covers makers of large language models and general-purpose AI assistants. The test is whether AI is the “primary (rather than incidental or ancillary) functionality”, and Meta decides that.

Meta’s own AI Providers page dates the change to 15 January 2026. It says general-purpose assistants are only permitted where Meta is legally required to allow them. The UK isn’t on that list.

In practice:

Two more rules apply to every automated experience. WhatsApp’s Business Messaging Policy allows automation inside the 24-hour window. It also requires “prompt, clear, and direct escalation paths”. A human agent in the chat, a phone number or an email all count.

Meta also sells its own agent. Meta Business Agent messages are billed at $2.00 per million tokens, which Meta estimates at about 4–5 US cents a message. A token is a small chunk of text that AI models are billed by.

What are the WhatsApp Business Platform rules?

The WhatsApp Business Platform is Meta’s service for businesses that send messages from software, not a phone. Most now use the Cloud API, the version Meta hosts for you. Four rules shape any agent you put on it.

Opt-in comes first

Before you message someone, Meta requires their opt-in. It must clearly say they’re agreeing to hear from you, and name your business. You choose how to collect it: a website form, SMS, a phone line or paper all count. Meta also advises clear instructions for opting out of each kind of message.

The 24-hour customer service window

When a customer messages or calls you, a 24-hour customer service window opens. Inside it, your agent can reply freely with text, images and buttons. Each new message from the customer restarts the clock. Once it closes, you can only send pre-approved templates.

This is why an agent works best answering people, not chasing them. Chasing needs templates.

Templates need approval

A template is a pre-written message, with gaps for names and dates, that Meta reviews before you use it. Meta sorts templates into three categories:

• Marketing: anything promotional, plus anything mixed or unclear.
• Utility: non-promotional messages tied to something the customer did or asked for, such as an order update.
• Authentication: one-time passcodes, using Meta’s own template format.

Meta checks the category you choose against the content. It can move an approved utility template into marketing, normally with a day’s notice. Repeated misclassification can lead to limits across your whole business account. Category matters, because marketing messages cost nearly three times as much in the UK.

Messaging limits

New business accounts can message 250 unique people outside service windows in a rolling 24 hours. Verifying your business, or sending enough good-quality templates, lifts that to 2,000. Higher tiers follow automatically. The limit is shared across every number in your business account, so plan launches around it.

What does WhatsApp cost per message in the UK?

Meta charges per delivered message, by category and by the recipient’s country. Messages from customers to you are free. These are Meta’s UK rates in pounds, from its GBP rate card effective 1 October 2026:

A few details change the bill:

• Service messages are no longer all free. From 1 October 2026, each business number gets 1,000 free service messages a month. Meta charges from the 1,001st, and unused messages don’t roll over.
• Utility templates inside the window are charged again, also from 1 October 2026.
• The recipient’s number sets the price. A guest with a French number is billed at France’s rate, £0.062 for marketing.
• Choose your currency carefully. GBP is one of Meta’s 16 billing currencies, and once chosen it can’t simply be changed.
• Prices move on set dates. Meta only changes rates on the first day of a quarter, with a month’s notice for rate card changes.

Rate cards for every currency sit on Meta’s pricing page, and WhatsApp Business shows rates interactively.

Worked example: 1,000 Founders Forum guests on WhatsApp

Electragram runs invitations, replies and reminders for luxury events. Hosts on it include Founders Forum, Daylesford and Trinny London. We took the platform over from its previous supplier in November 2025, mid-season, without dropping an event.

Hosts write one invitation in their own stationery. It goes out by email, SMS or WhatsApp in the host’s name, and guests reply in a tap. WhatsApp invitations went live in April 2026. More than 1,000 Founders Forum guests are now invited and managed on WhatsApp through Electragram.

Three lessons carry over to most businesses:

1. The person invited is rarely the person who replies. A PA accepts, then a driver needs details. Each guest has one record with their PA, driver and family linked. Any agent needs that record before it can answer properly.
2. WhatsApp sits beside other channels, not instead of them. Some guests read email, some don’t. The host writes once, and each guest gets it where they’ll read it.
3. AI does the chasing; people do the welcoming. Electragram’s AI assistant answers questions from the event’s own records and drafts nudges in the host’s voice. It also tidies guest details that disagree and sends the host a weekly summary. Guests can reply on WhatsApp too. Each reply goes to a person or to the assistant, depending on who the guest is and how the host has set up the event.

The guest data is personal, often high-profile, so it came with a GDPR programme. Every flow of guest data was mapped, contracts were updated and an EU representative was appointed. Each person sees only what their role needs.

As an illustration of Meta’s fees alone: one invitation to 1,000 UK numbers costs £45.80 as a marketing template, or £15.90 as utility. Meta decides which category applies, and international guests are billed at their own country’s rate.

What does UK GDPR ask of a WhatsApp agent?

Messages carry names, phone numbers and often more. Three questions cover most of it. Our AI and GDPR governance guide goes deeper.

What’s your lawful basis?

You need a lawful basis for each use of the data. Answering a customer who wrote to you usually rests on contract or legitimate interests. Marketing is stricter. The ICO says its electronic mail marketing rules cover direct messages on social media and similar stored messages. Plan on treating WhatsApp marketing the same way: consent, or the soft opt-in for existing customers with an opt-out in every message.

Who’s the processor?

You decide why and how the data is used, so you’re the controller. The ICO defines a processor as someone who processes data on the controller’s behalf. On the Cloud API, Meta says it acts as a data processor for your business. It keeps messages for up to 30 days. Your platform vendor and your AI model provider are usually processors too, and each needs a contract.

If location matters, the Cloud API offers local storage, with the United Kingdom among its regions. Meta notes that message content may still be processed elsewhere for up to 60 minutes.

What goes to the model?

Every message the agent reads is sent to an AI model, along with whatever records you give it. Keep that to what the job needs. A booking agent needs the booking, not the customer’s whole history. Check where the model provider processes data and whether it trains on it. Then say in your privacy information that an AI system reads messages. The ICO’s guidance on AI covers transparency, though it’s under review after the Data (Use and Access) Act.

Should you buy a platform or build your own?

Most businesses should start with a platform. Build when the agent has to act inside your own systems, or WhatsApp is part of what you sell.

These are real options, with prices from their own pages:

Platforms are quick to start and cheap to try. They struggle when the agent must read your own booking engine, guest record or product. That’s where Electragram sat: its guest record is the product, so the WhatsApp channel had to be part of it.

Build when:

• the agent must act inside your own software, not just answer from help pages
• WhatsApp is one channel among several that share one record
• you need control over where data goes and which model reads it
• the agent is part of what your customers pay you for

Our guide to buying, configuring or building AI walks through that choice, and what an AI agent costs to build and run covers build budgets.

What does a WhatsApp agent cost to run each month?

There are five lines. Here’s an illustration for a business handling 3,000 customer conversations a month, with four agent replies in each.

These are Meta’s list rates and published platform prices, not a quote. Two things push the bill up fastest. One is marketing templates, at nearly three times utility rates. The other is a chatty agent that splits one answer into three messages, each charged. Model the busy month, not the average one.

What should you ask a WhatsApp AI supplier?

• Which of our messages will be marketing, utility or service, and who checks the template categories?
• How do we collect and record opt-in, and how do people opt out?
• What happens when the agent can’t answer, and how fast does a person pick up?
• Which AI model reads our messages, where is it processed, and is our data used for training?
• Who’s the processor for each step, and can we see the contracts?
• Do you add a markup to Meta’s message fees?
• Which business account and phone number do we own, and can we move them if we leave?
• How will we know in month three whether it’s paying for itself?
• Does the agent stay within Meta’s rules on AI Providers, and who answers to Meta if it doesn’t?

A supplier who can’t answer these plainly is telling you something.

Where Contic fits

If you’re weighing up an agent on WhatsApp, start with a free first chat. You’ll get guidance on what we’d do, from people who do this all the time. If a platform will do the job, that’s worth hearing before you spend anything. A paid discovery doesn’t have to follow.

Our AI team builds agents that act on your own records, in your own voice, as we did for Electragram. In our experience, an agent can cost as little as £500 to set up. Realistically, £5,000 is the lower bound for a well-managed project. You own the code and IP, and our contract assigns it to your company in writing.

We’re registered with the ICO and hold Cyber Essentials Plus. If data is your first worry, here’s how we keep your data safe when we use AI. To talk through a specific job, get in touch.