Circle and Proof test a way for AI shopping agents to prove who they work for

Circle and Proof have demonstrated a way for an AI shopping agent to show a store who it works for and then pay in the same exchange. The goal is to give businesses a reason to accept AI agents instead of blocking them. Proof's identity tool went live last week.

What changed

The demo combines two open standards. Proof's x401 lets a store say what proof of identity it needs and which issuers of credentials it trusts. Circle's x402 tells the agent how to pay. In short, x401 answers who the agent acts for, and x402 answers how the payment settles.

In the demo, the store asks for both at once. The agent presents a verified credential and a signed approval for that specific purchase. The credential comes from identity checks certified to a US standard called NIST IAL2. Then the agent pays in USDC, a digital dollar, from a Circle wallet.

Why stores might care

Two details stand out. First, only the needed identity facts are shared. The store does not receive or keep a full ID document. Second, the store keeps signed, tamper-evident proof of who authorized the purchase. If there is a dispute, it can use that record without calling Proof again at that moment.

Proof founder and CEO Pat Kinsel said one exchange can answer both questions, which gives businesses a reason to say yes to agents.

A side feature

Proof prices each identity claim separately. The same payment channel can send a small payment from the store to the identity provider for each check it uses. A store could pay for a check on the spot, without first signing a contract with that provider.

What is not settled

• This is a demo, not a rollout to shoppers.
• It is one of several competing approaches, including W3C verifiable credentials work and tools from payment networks and cloud providers.
• Regulators may not accept this kind of identity proof for anti-money laundering checks, known as KYC. That is an open question.

The timing matters. Several large institutions at Money20/20 are understood to be blocking AI agent traffic entirely. That carries its own cost as more people use AI assistants. The material also notes that the UK and the EU have comparable identity frameworks, so a credential like this could eventually be recognized across borders.

Who it affects

If AI assistants start buying for you or your customers, checks like this could decide whether stores accept them and who is responsible when something goes wrong. Business owners should watch which approach wins out. Everyday shoppers have nothing to do yet.