Legacy commerce vs the agentic era
By Malin Gaertig · August 24, 2026
Every legacy commerce metric assumes a human is doing the clicking. Over the last couple of weeks, three separate events confirmed that assumption is breaking, one row of the framework at a time.
- —The Ninth Circuit's Perplexity ruling and the card-network KYA pilots show trust is moving from site badges to authenticated, tokenised agent credentials.
- —UCP and ACP are not competing for the same job; brands must decide which modules of each protocol their catalogue and checkout stack need to support now.
- —As commerce media spend shifts toward agent-mediated discovery, machine-readable feeds and clean catalogue data become urgent priorities, not future nice-to-haves.
| Dimension | Legacy digital commerce | Agentic commerce era |
|---|---|---|
| Interface | Search engines, branded websites, mobile apps | Conversational AI agents, multi-agent frameworks |
| Optimisation focus | SEO keywords, hero graphics, UX conversion funnels | Machine-readable feeds, stock accuracy, clear returns policy |
| Transaction flow | Browse and buy, manual cart checkout | Protocol-driven checkout (UCP, ACP) |
| Trust mechanism | Site security badges, brand reputation | Tokenised credentials, cryptographic intent validation |
Interface, discovery, transaction and trust are all shifting at once. MARK exists for exactly this because most brands have no idea whether they're even visible to the agents making these decisions on their customers' behalf. That's a gap you can audit this month.
Trust mechanism
On 4 August, the Ninth Circuit vacated Amazon's injunction against Perplexity's Comet agent, ruling that when a user directs an agent to shop, it's the user accessing the platform, not Perplexity. The ruling is narrow and Amazon's other claims survive. But it removes the legal cover platforms had for blanket 'no agents' bans and opens the way for permissioned access.
That's exactly the gap KYA (Know Your Agent) frameworks from Visa and Mastercard are being built to fill. Singapore is already ahead here, running live authenticated transactions over PayNow and QRIS with early card-network pilots. Australia has the consumer appetite for conversational discovery but a genuine trust gap on autonomous purchase execution, which is why Commonwealth Bank and Mastercard Sydney are running sovereign pilots of their own rather than waiting for global rails.
Transaction flow
Google and Shopify's UCP and OpenAI and Stripe's ACP aren't racing for the same job. UCP handles discovery, checkout and post-purchase as separate modules. ACP is narrower, a checkout and payment rail that keeps the merchant as the system of record. Brands betting on one protocol winning outright are solving the wrong problem. The more useful question is which modules of each protocol your catalogue and checkout stack actually need to support now and a brand that's only built for one will be invisible on the other.
Optimisation focus and interface
WPP Media projects commerce media spend will overtake television advertising globally this year, on its way to a market worth over $174 billion. Most of that spend still assumes a human is scrolling a feed. The more plausible read isn't that this budget disappears, it's that a growing share of the attention it's chasing shifts to an agent instead, which is what makes machine-readable feeds and clean catalogue data urgent now rather than a future nice-to-have.