Where should a Universal Commerce Profile be published?

At /.well-known/ucp on your storefront's public HTTPS domain. The validator fetches that exact path and shows whether it is reachable.

Does it check whether AI shopping agents can read my store?

Yes. The validator reviews robots.txt so you can see whether major shopping and indexing bots are allowed to reach your Universal Commerce Profile without friction.

Protocol check

UCP Validator

Check whether a storefront publishes a valid Universal Commerce Profile at /.well-known/ucp and whether shopping agents can read it without friction.

Validate a domain Open playground

Free to use
No account required
Live /.well-known/ucp fetch

What the validator inspects.

A live fetch of your public profile, parsed against the UCP spec, with agent access surfaced from robots.txt.

Universal Commerce Protocol

/.well-known/ucp

"capabilities":

- dev.ucp.shopping.catalog.search

- dev.ucp.shopping.catalog.lookup

- dev.ucp.shopping.cart

- dev.ucp.shopping.checkout

- dev.ucp.shopping.fulfillment

- dev.ucp.shopping.discount

- dev.ucp.shopping.order

Endpoint reachability

We request the public HTTPS domain and confirm that /.well-known/ucp responds.

Schema hygiene

The response body is parsed as JSON and checked for UCP spec errors and warnings.

Agent access

robots.txt is reviewed so you can see whether major shopping and indexing bots are blocked.

Run a live validation.

Paste a domain and we fetch the live profile, parse every service and capability, then report spec errors and agent access.

Live fetch

HTTPS · spec 2026-04-08

GET /.well-known/ucp HTTP/1.1
Host: yourdomain.com
Accept: application/json
UCP-Agent: profile="https://ucp.dev/..."

We request the public profile, parse services and capabilities, then surface spec issues and agent access from robots.txt.

GET /.well-known/ucp HTTP/1.1
Host: store.example.com
Accept: application/json
UCP-Agent: profile="https://ucp.dev/..."

HTTP/1.1 200 OK
Content-Type: application/json

{
  "ucp": {
    "version": "2026-04-08",
    "services": {
      "dev.ucp.shopping": [ ... ]
    },
    "capabilities": {
      "dev.ucp.shopping.cart": [ ... ],
      "dev.ucp.shopping.checkout": [ ... ]
    },
    "signing_keys": [ { "kty": "EC", ... } ],
    "payment_handlers": { ... }
  }
}

What we validate

HTTPS & reachability

Profile discovery

/.well-known/ucp

Services & transports

REST · MCP · A2A

Capabilities

dev.ucp.shopping.*

Payment handlers

payment.handlers[]

Signing keys

signing_keys · RFC 9421

Supported versions

supported_versions[]

Agent access

robots.txt

Questions before you validate.

What the checker covers, where profiles live, and how agent access is surfaced.

It requests the public HTTPS domain, confirms /.well-known/ucp responds, parses the body as JSON, and reports UCP spec errors and warnings so you know the profile is well formed.

All free tools Validate a domain

Free · No account required · Live fetch

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GET /.well-known/ucp HTTP/1.1 Host: store.example.com Accept: application/json UCP-Agent: profile="https://ucp.dev/..." HTTP/1.1 200 OK Content-Type: application/json { "ucp": { "version": "2026-04-08", "services": { "dev.ucp.shopping": [ ... ] }, "capabilities": { "dev.ucp.shopping.cart": [ ... ], "dev.ucp.shopping.checkout": [ ... ] }, "signing_keys": [ { "kty": "EC", ... } ], "payment_handlers": { ... } } }

UCP Validator