For twenty years the job of a business website has been to persuade a human. Good copy, a tidy layout, a checkout that doesn't lose people at the last step. That assumption is quietly being rewritten. A growing share of the traffic arriving at online storefronts is no longer a person browsing at all - it is an AI agent, acting on someone's behalf, comparing options, reading prices and, increasingly, completing the purchase without a human ever seeing your homepage. This is agentic commerce, and in the UK it has moved from conference-slide theory to something you can watch happening.
The numbers are still small but the trajectory is not. Industry estimates put the share of UK transactions currently involving an AI agent at around 3%, yet 89% of merchants say they are actively preparing for agentic commerce, and roughly half of the country's largest retailers are already investing in it. The gap between intent and readiness is where the story gets interesting - and where smaller businesses have a genuine window to move sensibly rather than expensively.
What agentic commerce actually means
Strip away the jargon and the idea is simple. An agentic system is software that can discover, decide and transact on a user's behalf within limits they set. Instead of you searching "waterproof walking boots, size 9, under £120" and clicking through ten tabs, you tell an assistant what you want and it does the legwork: it finds candidates, checks stock and delivery, weighs the reviews, and either presents a shortlist or simply buys the thing. The human sets the intent and the guardrails; the agent handles the multi-step slog in between.
That shift changes what a website is for. When the "visitor" is a language model rather than a person, your beautifully art-directed product page is close to invisible. What the agent reads is your structured data - the price, the stock level, the delivery window, the return terms, the specifications - and how easily it can act on them. A site that a human finds delightful can be functionally illegible to an agent, and vice versa. For most UK small businesses that is the uncomfortable, and useful, realisation: the work is less about marketing polish and more about plumbing.
The protocol scramble - and why it matters for your site
Behind the scenes, the big platforms are racing to define how agents and shops talk to each other, and there is no single winner yet. OpenAI and Stripe have published the Agentic Commerce Protocol (ACP) as a checkout layer; Google has its Agent Payments Protocol (AP2), built around cryptographically proving that a user genuinely authorised a purchase; Coinbase is pushing x402 for machine-to-machine payments; and Anthropic's Model Context Protocol (MCP) has become the common way agents discover and use external tools. On the payments side, Visa launched its Intelligent Commerce platform back in April 2025, and this year Mastercard and Santander completed what was billed as Europe's first live, end-to-end payment executed by an AI agent. Microsoft has also rolled Copilot Checkout into the US market.
You do not need to bet on which of these standards wins - and you certainly should not rebuild your site around any one of them today. The practical takeaway is subtler: nearly all of these protocols reward the same underlying hygiene. Clean, machine-readable product data. Clear, unambiguous pricing. A way to prove consent. Payment rails that settle reliably. Get those right and you are broadly compatible with wherever the standards land, which is exactly the sort of low-regret groundwork we tend to steer clients towards rather than chasing every announcement.
Why most UK sites aren't ready
Here is the mismatch worth sitting with. While 89% of merchants say they are preparing, only about 15% of the UK's top 100 retailers actually have payment systems ready for agent-driven transactions. If the biggest players are that far behind their own stated ambitions, the average independent retailer or service business is further back still - usually through no fault of their own, because the tooling has only just arrived. Trust is the other brake: surveys suggest only around one in ten consumers currently trusts AI to make financial decisions, so nobody is handing their card to an agent overnight. That is precisely why the coming period rewards quiet preparation over dramatic reinvention.
Regulation is catching up in parallel, and it is worth knowing where the UK stands. In March 2026 the Competition and Markets Authority made the position plain: existing consumer-protection law applies whether a purchasing decision is made by a person or by an AI. The FCA's Mills Review, examining AI's longer-term impact on retail finance, is due this summer, and HM Treasury is expected to consult on updating payment-services law. The unresolved question everyone is circling is liability - who is responsible when an agent gets it wrong - and until that settles, regulators expect merchants to keep humans in the loop with sensible limits, logging and the ability to review what agents have done. If you sell online in Britain, that framing should shape your roadmap: build for auditability now, not later.
What to do now
The good news is that almost everything that makes your site agent-ready also makes it better for humans and for search. Start by making your products genuinely machine-readable: structured product data, honest and current pricing, accurate stock and delivery information, and clean, well-documented endpoints rather than data buried in images or PDFs. Tidy structured data is the same investment that helps you surface in AI-driven search results too, a theme we return to often in our Insights. From there, think about consent and payments - favouring authenticated, instant, hard-to-reverse methods such as open banking payments over easily disputed card flows - and keep a clear audit trail of any automated activity so you stay on the right side of the CMA's guidance. This is the kind of unglamorous back-end work we handle when we build and maintain websites for clients, and it pays for itself long before agents become mainstream.
What to do next is refreshingly undramatic. Don't rip anything out and don't buy a shiny "agentic" bolt-on from the first vendor that emails you. Instead, audit what an agent can currently read on your site, fix the data hygiene, make sure your prices and stock are a single source of truth, and confirm your payment provider has a credible agentic roadmap. Treat this quarter as groundwork: get the plumbing right while the standards settle, so that when your customers do start sending agents to shop for them, your business is simply ready rather than scrambling.