Protocol Commerce · The category, not another protocol
Protocol Commerce
The infrastructure layer beneath Agentic Commerce: open protocols that let AI agents, merchants and payment systems trade directly — the meta-category above individual standards such as ACP, UCP, AP2 and AdCP. A term I have been shaping in the German-speaking world, and the field I build for with Nexbid.
What is Protocol Commerce?
Protocol Commerce is commerce that no longer runs through websites and shopping carts, but through open protocols between AI agents, merchants and payment systems — the meta-category above individual standards such as ACP, UCP, AP2 and AdCP.
Is Protocol Commerce the same as Agentic Commerce?
No — Agentic Commerce describes the behaviour (autonomous agents that buy), while Protocol Commerce describes the infrastructure beneath it: the what versus the how.
What is the difference between AdCP, ACP and UCP?
ACP (OpenAI/Stripe) governs checkout inside the chat, UCP (Google/Shopify) governs product discovery, and AdCP (Scope3, Yahoo, PubMatic) governs the advertising and auction layer — which product an agent sees first, and who pays for it.
Full comparison of the three protocols — who writes the rules when machines shop? (in German)
Who sets the standards in Agentic Commerce?
The large platforms — OpenAI/Stripe (ACP), Google/Shopify (UCP), Google/FIDO (AP2) — while AdCP is carried as a neutral standard by AgenticAdvertising.org; what remains open is who controls the ranking and auction of the agents.
Why is the advertising and auction layer in Agentic Commerce still unclaimed?
Discovery and payment are largely settled by standards, but the layer in between — which product an agent recommends and who pays for that visibility — is claimed by no established standard (Nexbid's focus).
What does Protocol Commerce mean for Swiss companies?
Visibility shifts from Google rankings to machine-readable catalogues: companies that do not expose their product data through open protocols will be overlooked by shopping AI agents — and FADP-compliant European infrastructure is part of the decision.
Who wins the Protocol Wars — has Instant Checkout prevailed?
So far no one — OpenAI discontinued Instant Checkout in March 2026 after Walmart conversion came in three times worse; the market is moving towards “discover in AI, buy on site”, with several protocols supported in parallel.
Who is Holger von Ellerts in the context of Protocol Commerce?
Holger von Ellerts is an AI lecturer and entrepreneur from Zug who coined the term Protocol Commerce in the German-speaking world, has taught at Swiss universities since 2017, and is building open infrastructure with Nexbid for the still-unclaimed advertising layer of agentic commerce.
Nexbid — the infrastructure behind it
Agents you can
actually trust.
Agentic commerce only works if people can trust the agents that research, compare and buy on their behalf. Today they largely can't: rankings are opaque, auctions are closed, and the platform's interests are rarely the user's. That is where Nexbid comes in — the open-source infrastructure I build with digital opua. Not another closed marketplace, but an open standard that belongs to everyone who builds on it.
- Transparent scoring instead of a black box — you can see why an agent recommends something.
- Open auctions instead of back rooms — the same rules for every provider.
- MIT-licensed, privacy-native — an open standard, not a walled garden.
Building for the agentic web?
If you are a merchant, publisher or platform working out how AI agents will find and buy your products, let's talk. I teach what I build — and I am building the open advertising layer with Nexbid.
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