What does it mean that lab.ucpchecker.com is verified for UCP?

It means lab.ucpchecker.com publishes a valid UCP profile at /.well-known/ucp, the profile passes schema validation against 2026-08-25, and AI agents can discover its commerce capabilities without needing to scrape HTML. That is what the store declares. Whether an agent actually completes a purchase is a separate question — where an observed agent run is shown on this page, it answers that one.

Can I trust lab.ucpchecker.com for AI agent purchases?

Verified means the store publishes a UCP profile at /.well-known/ucp that passes schema validation, with its services and payment handlers declared. Where we call a service, such as asking an MCP service for its tools, this page shows the answer; services we did not call are marked as declared only. It doesn't grade business reputation or fulfilment quality. For trust on the commerce side itself, check the store's own reviews. For the agent integration side, this page shows what the store's UCP profile declares and whether it validates.

What platform does lab.ucpchecker.com use for UCP?

Our detection identifies lab.ucpchecker.com as running on Custom. Many large UCP-verified stores use Shopify, BigCommerce, or custom stacks built on the open spec. The transport list above shows the exact mechanism (REST, MCP, A2A, Embedded) the profile declares.

How was this UCP report for lab.ucpchecker.com generated?

Our crawler fetches lab.ucpchecker.com/.well-known/ucp directly, parses the profile against the official UCP JSON schema, checks robots.txt for its rules for AI crawlers, and runs payment-handler validation. No manual review, no opinions — just what the profile actually says. The check ran 16 hours ago.

How do I get a newer result for lab.ucpchecker.com?

This page shows the stored result of our last check and when it was observed. To run a new check, use Check again on this page.

Why does this status matter?

Universal Commerce Protocol is an open standard that lets a UCP agent find out what a store sells, build a cart and check out through a published contract instead of reading web pages. A valid UCP profile is how a store declares that support.

UCP Score

UCP Score for lab.ucpchecker.com

Nearly there

80 out of 100, grade B: nearly there. The missing 20 points are spread across Discovery and Conformance and Capabilities. One spec break on the status page isn't counted in the score.

Discovery 80Conformance 98Capabilities 55release 2026-08-25

UCP Score 80/100 grade B · nearly there

Points missing 20 Discovery, Conformance, Capabilities Fixes 5 raise the score Spec breaks 1 not in the score

How the score is made

three areas, weighted

Discovery 30%

Can a UCP agent find and read the profile: HTTPS, an answer at /.well-known/ucp, robots.txt allowing it, and five files outside UCP (llms.txt, sitemap, Open Graph, Organization schema, viewport).

80−6 pts

Conformance 40%

Does the profile follow the spec: valid against its release (counted three times), a dated release, keys published, few warnings, spec and schema links that resolve.

98−0.8 pts

Capabilities 30%

What an agent can do here: how many capabilities, checkout, at least one service, payment handlers, and services that answer our check.

55−13.5 pts

A85–100Ready for UCP agents

B70–84Nearly there

C50–69Partly ready

D30–49Hard for UCP agents

F0–29Not ready

Raise the score

fixes that move the number

1Fix broken spec or schema URLs

One or more spec/schema URLs declared in the profile do not resolve.

Spec and schema URLs let agents validate request/response shapes before sending. When they 404 or time out, runtime validation degrades to "best effort" and strict agents reject the integration entirely. Common cause: copy-pasting a placeholder URL during initial profile setup. See the Full Check Breakdown for the specific URLs that failed.

Conformance · effort low

part of +6

2Publish Organization schema (JSON-LD) on the homepage

No Organization-typed JSON-LD detected on your homepage.

Organization schema gives agents a structured representation of your brand identity: name, logo, social profiles, contact info, founding date. Agents use this to verify you are who you claim to be and to link your profile data to a recognizable entity.

Discovery · effort medium

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "OnlineStore",
  "name": "Yourstore",
  "url": "https://yourstore.com",
  "logo": "https://yourstore.com/logo.png",
  "sameAs": [
    "https://twitter.com/yourstore",
    "https://www.instagram.com/yourstore"
  ],
  "contactPoint": {
    "@type": "ContactPoint",
    "telephone": "+1-800-000-0000",
    "contactType": "Customer Service"
  }
}
</script>

Drop into <head> or end of <body>. Use OnlineStore (more specific) when the entire site is an ecommerce store; Organization is the generic fallback.

part of +6

3Publish a sitemap.xml

No sitemap.xml detected at the root of your domain.

Sitemaps tell agents and crawlers which pages on your store are canonical and how often they change. Without one, agents fall back to following internal links, which is slower and less complete, especially for catalog pages buried behind faceted nav.

Discovery · effort low

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://yourstore.com/</loc>
    <changefreq>daily</changefreq>
  </url>
  <url>
    <loc>https://yourstore.com/products</loc>
    <changefreq>daily</changefreq>
  </url>
  <!-- one <url> entry per indexable page -->
</urlset>

Most ecommerce platforms generate sitemap.xml automatically. If yours does not, generate one and serve it at /sitemap.xml.

part of +6

4Add Open Graph meta tags to the homepage

OG tags missing or incomplete on your homepage.

OG tags give agents and link unfurlers (Slack, iMessage, ChatGPT) a clean title, description, and image to represent your store. Without them, shares show garbled fallback text.

Discovery · effort low

<meta property="og:title" content="Yourstore | short tagline">
<meta property="og:type" content="website">
<meta property="og:url" content="https://yourstore.com/">
<meta property="og:description" content="One-sentence description of what you sell.">
<meta property="og:image" content="https://yourstore.com/og-cover.jpg">
<meta property="og:site_name" content="Yourstore">

Add inside <head>. og:title and og:type are the minimum; og:url, og:description, and og:image are strongly recommended.

part of +6

5Add a mobile viewport meta tag

No viewport meta tag detected on your homepage.

Mobile-originating agent sessions (ChatGPT iOS, Apple Intelligence) render store pages in browser sandboxes that respect the viewport tag. Without it, the page renders at desktop width and pinch-to-zoom UX kicks in, and agents that take screenshots of pages get unreadable images.

Discovery · effort low

<meta name="viewport" content="width=device-width, initial-scale=1">

One line inside <head>. Modern frontend frameworks add this automatically; its absence usually means a hand-rolled or legacy template.

Every check

11 passed · 8 to fix

Agent Discovery · 4 of 8

4 OK

HTTPS, UCP profile reachable, AI bot access, llms.txtShow

HTTPS · Profile URL uses https://
UCP profile reachable · HTTP 200
AI bot access · robots.txt allows /.well-known/ucp
llms.txt · Found at /llms.txt

Problem

sitemap.xml

HTTP 404 at /sitemap.xml. Fix 3 above.

Discovery

Problem

Open Graph tags

Missing or incomplete on homepage. Fix 4 above.

Discovery

Problem

Organization schema (JSON-LD)

Missing or incomplete on homepage. Fix 2 above.

Discovery

Problem

Mobile viewport meta

Missing or incomplete on homepage. Fix 5 above.

Discovery

UCP Conformance · 4 of 5

4 OK

Profile passes schema validation, Protocol version present and well-formed, Public keys published, No validation warningsShow

Profile passes schema validation · No structural errors
Protocol version present and well-formed · Version: 2026-08-25
Public keys published · Keys published at the top level
No validation warnings · No outstanding validation issues

To fix

Spec & schema URLs resolve (4)

Resolved with an unexpected content-type: https://ucpchecker.com/methodology#pricing.

Conformance

Capability Coverage · 3 of 6

3 OK

Transports declared, Payment handlers, MCP transport reachableShow

Transports declared · MCP, REST
Payment handlers · 1 handler registered
MCP transport reachable · tools/list returned a JSON-RPC response in 462ms

Problem

Capabilities declared

0 of 6 capability families detected. A family counts once however many namespaces or extensions declare it.

Capabilities

Problem

Checkout capability

No checkout capability.

Capabilities

To fix

REST transport reachable

Host responded with HTTP 405 — endpoint reachable but path may be method-restricted.

Capabilities

Not in the score, but worth fixing first

spec breaks

To fix

The profile has no ETag or Last-Modified header

Spec level: SHOULD. Not part of the UCP Score.

on the status page

The score measures what the profile declares across the three areas above. These break a rule in the spec that agents follow, so they can stop an agent before the score matters.

Files for agents

outside UCP · not part of the UCP Score

Files lab.ucpchecker.com publishes for agents beyond its UCP profile, from our weekly look. Only what we found is listed.

Found

ard.json /.well-known/ard.json

An agent resource catalogue (ARD) listing what agents can use.

20 Oct

Found

mcp.json /.well-known/mcp.json

An earlier way of pointing agents at an MCP server.

19 Oct

Found

Signatures directory /.well-known/http-message-signatures-directory

Keys for agents that sign their requests (Web Bot Auth).

17 Oct

Found

Agent skills /.well-known/agent-skills/index.json

Ready-made instructions an agent can load to work with the store.

ucp-agent-readyucp-checker

16 Oct

Found

MCP server card /.well-known/mcp/server-card.json

Describes the store's MCP server before an agent connects.

16 Oct

Found

ai-catalog.json /.well-known/ai-catalog.json

The earlier name for the ARD catalogue.

15 Oct

/.well-known/ard.json as served 6.6 KB

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/.well-known/mcp.json as served 3.1 KB

{"mcp":{"version":"1.0","servers":[{"name":"UCP Checker","description":"Read-only resolver for agentic commerce. Check any domain for UCP support, resolve which verified stores match an intent, and read their catalogs and policies. Does not transact \u2014 buy with the merchant.","transport":"http","url":"https:\/\/lab.ucpchecker.com\/mcp","authentication":null,"tools":[{"name":"list-categories","description":"List the categories in the verified index, with store counts.","inputSchema":{"type":"object","properties":{}}},{"name":"list-stores","description":"List verified UCP stores, optionally filtered by category and minimum score.","inputSchema":{"type":"object","properties":{"category":{"type":"string","description":"Category slug from list-categories (optional)"},"minScore":{"type":"integer","description":"Minimum UCP score (optional)"}}}},{"name":"check-domain","description":"Check if a domain supports UCP. Returns status, version, capabilities, latency, and AI bot policies.","inputSchema":{"type":"object","properties":{"domain":{"type":"string","description":"The domain to check (e.g., \"shopify.com\")"}},"required":["domain"]}},{"name":"discover-store","description":"Connect to a store's MCP endpoint and list all available shopping tools.","inputSchema":{"type":"object","properties":{"domain":{"type":"string","description":"The store domain (e.g., \"allbirds.com\")"}},"required":["domain"]}},{"name":"search-catalog","description":"Search for products on any UCP-enabled Shopify store. Returns products with prices and variant IDs.","inputSchema":{"type":"object","properties":{"domain":{"type":"string","description":"The store domain (e.g., \"allbirds.com\")"},"query":{"type":"string","description":"Product search term (e.g., \"tree topper\")"}},"required":["domain","query"]}},{"name":"get-product-details","description":"Get a product's full declared detail, including variants. Use after search-catalog.","inputSchema":{"type":"object","properties":{"domain":{"type":"string","description":"The store domain (e.g., \"allbirds.com\")"},"productId":{"type":"string","description":"The product ID from search-catalog results (e.g., \"gid:\/\/shopify\/Product\/123456\")"}},"required":["domain","productId"]}},{"name":"search-policies","description":"Search store policies (return, shipping, refund, privacy, terms). Use when a user asks about policies.","inputSchema":{"type":"object","properties":{"domain":{"type":"string","description":"The store domain (e.g., \"allbirds.com\")"},"query":{"type":"string","description":"Policy search term (e.g., \"return policy\", \"shipping\")"}},"required":["domain","query"]}},{"name":"search-all","description":"Search for products across all verified UCP stores at once. Returns results grouped by store.","inputSchema":{"type":"object","properties":{"query":{"type":"string","description":"Product search term (e.g., \"running shoes\")"},"maxStores":{"type":"integer","description":"Maximum number of stores to search (default: 5, max: 10)"},"country":{"type":"string","description":"ISO country code for localized pricing (e.g., \"US\", \"GB\")"}},"required":["query"]}}]}]}}

/.well-known/http-message-signatures-directory as served 90 B

{"keys":[{"kty":"OKP","crv":"Ed25519","x":"q8ZW0cYPCa8kg6kChFCdzjOK9bMJ1LFsu7TVHO3uyj4"}]}

/.well-known/agent-skills/index.json as served 1.3 KB

{"$schema":"https://schemas.agentskills.io/discovery/0.2.0/schema.json","skills":[{"name":"ucp-agent-ready","type":"skill-md","description":"Publish or repair a Universal Commerce Protocol (UCP) profile so AI shopping agents can discover, read and transact with a store, verified against UCP Checker's independent validator. Use when asked to \"make this store agent-ready\", \"add UCP\", \"fix our /.well-known/ucp\", \"improve our UCP score\", or when a UCP check reports errors or warnings. Drives a check \u2192 fix \u2192 re-check loop over the keyless UCP Checker API.","url":"/.well-known/agent-skills/ucp-agent-ready/SKILL.md","digest":"sha256:afb614ef019693f7e1bbbd51cc05f574c548d220f1fa3a466357cde9a42e8466"},{"name":"ucp-checker","type":"skill-md","description":"Find stores an AI agent can actually transact with, and check any domain's Universal Commerce Protocol (UCP) status, using the UCP Checker resolver. Use when choosing a store that supports agentic checkout, checking whether a merchant is agent-ready, or comparing stores by UCP conformance. Read-only: it resolves and measures, it never carts or checks out. Designed for agents evaluating merchants before acting.","url":"/.well-known/agent-skills/ucp-checker/SKILL.md","digest":"sha256:f6a2de7ebd9869c5be0646a485a9339345bfe154d3d42706305e06f6d38df125"}]}

/.well-known/mcp/server-card.json as served 2.8 KB

{"name":"ucp-checker","version":"2.0.0","kind":"product","description":"UCP Checker \u2014 check any domain for Universal Commerce Protocol support and resolve verified UCP storefronts: search catalogs across the fleet, read policies, and link each store to its public Conformance Record. Read-only; transact with the merchant.","icon":"https://lab.ucpchecker.com/favicon.ico","url":"https://lab.ucpchecker.com/mcp","transport":"streamable-http","instructions":"Read-only resolver. Start with check-domain to see whether a store supports UCP, list-stores or search-all to find verified stores and products, then search-catalog / get-product-details / search-policies to compare them on observed evidence. This server does not transact \u2014 go to the merchant to buy. All reads are keyless. For discovery across the whole fleet use the ARD registry at https://lab.ucpchecker.com/ard (POST /search).","capabilities":{"tools":true,"resources":false,"prompts":true},"tools":[{"name":"list-stores","description":"List verified UCP storefronts across every platform, best-evidenced first.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"list-categories","description":"List store categories with store counts.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"check-domain","description":"Check if a domain supports Universal Commerce Protocol (UCP).","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"discover-store","description":"Discover available shopping tools on a UCP-enabled store.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"search-catalog","description":"Search for products on any UCP-enabled Shopify store.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"search-all","description":"Search for products across verified UCP stores at once.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"search-policies","description":"Search store policies on any UCP-enabled Shopify store.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}},{"name":"get-product-details","description":"Get full product details including variant IDs from a UCP-enabled store.","annotations":{"readOnlyHint":true,"idempotentHint":true,"openWorldHint":false,"destructiveHint":false}}],"documentation":"https://lab.ucpchecker.com/mcp-tools","discovery":{"aiCatalog":"https://lab.ucpchecker.com/.well-known/ai-catalog.json","ardRegistry":"https://lab.ucpchecker.com/ard","llmsTxt":"https://lab.ucpchecker.com/llms.txt"}}

/.well-known/ai-catalog.json as served 6.6 KB

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Read-only discovery \u2014 no cart, no checkout.","tags":["mcp","ucp","shopping","checker","router"],"capabilities":["list-stores","list-categories","check-domain","discover-store","search-catalog","search-all","search-policies","get-product-details"],"representativeQueries":["does this domain support UCP","search every verified UCP store for a wool jumper","add this product to my cart and give me a checkout link"],"trustManifest":{"identity":"https://ucpchecker.com","identityType":"https","attestations":[{"type":"Web-Bot-Auth-JWKS","uri":"https://lab.ucpchecker.com/.well-known/http-message-signatures-directory","mediaType":"application/http-message-signatures-directory+json"},{"type":"UCP-Profile","uri":"https://lab.ucpchecker.com/.well-known/ucp","mediaType":"application/json"}]}},{"identifier":"urn:air:ucpchecker.com:api:v1","displayName":"UCP Checker public API v1","type":"application/json","url":"https://lab.ucpchecker.com/api/v1/schema","description":"Keyless REST API: run a live UCP check and read a domain's current status, capabilities and score.","tags":["api","rest","ucp","validation"],"capabilities":["check","status"],"representativeQueries":["validate the UCP profile at example.com","what is the UCP score for allbirds.com"],"trustManifest":{"identity":"https://ucpchecker.com","identityType":"https","attestations":[{"type":"Web-Bot-Auth-JWKS","uri":"https://lab.ucpchecker.com/.well-known/http-message-signatures-directory","mediaType":"application/http-message-signatures-directory+json"},{"type":"UCP-Profile","uri":"https://lab.ucpchecker.com/.well-known/ucp","mediaType":"application/json"}]}},{"identifier":"urn:air:ucpchecker.com:skill:ucp-agent-ready","displayName":"Make a store agent-ready with UCP","type":"text/markdown; profile=\"urn:air:agent-skills\"","url":"https://lab.ucpchecker.com/.well-known/agent-skills/ucp-agent-ready/SKILL.md","description":"Publish or repair a Universal Commerce Protocol (UCP) profile so AI shopping agents can discover, read and transact with a store, verified against UCP Checker's independent validator. Use when asked to \"make this store agent-ready\", \"add UCP\", \"fix our /.well-known/ucp\", \"improve our UCP score\", or when a UCP check reports errors or warnings. Drives a check \u2192 fix \u2192 re-check loop over the keyless UCP Checker API.","tags":["skill","ucp","agentic-commerce"],"representativeQueries":["make my Shopify store agent-ready with UCP","fix the errors in our /.well-known/ucp manifest","improve our UCP Checker score","validate a UCP profile before launch"],"trustManifest":{"identity":"https://ucpchecker.com","identityType":"https","attestations":[{"type":"Web-Bot-Auth-JWKS","uri":"https://lab.ucpchecker.com/.well-known/http-message-signatures-directory","mediaType":"application/http-message-signatures-directory+json"},{"type":"UCP-Profile","uri":"https://lab.ucpchecker.com/.well-known/ucp","mediaType":"application/json"}]}},{"identifier":"urn:air:ucpchecker.com:skill:ucp-checker","displayName":"Resolve verified UCP stores with UCP Checker","type":"text/markdown; profile=\"urn:air:agent-skills\"","url":"https://lab.ucpchecker.com/.well-known/agent-skills/ucp-checker/SKILL.md","description":"Find stores an AI agent can actually transact with, and check any domain's Universal Commerce Protocol (UCP) status, using the UCP Checker resolver. Use when choosing a store that supports agentic checkout, checking whether a merchant is agent-ready, or comparing stores by UCP conformance. Read-only: it resolves and measures, it never carts or checks out. Designed for agents evaluating merchants before acting.","tags":["skill","ucp","agentic-commerce"],"representativeQueries":["find a store where an agent can buy running shoes","is allbirds.com agent-ready","which verified UCP stores sell furniture","check this domain for UCP support"],"trustManifest":{"identity":"https://ucpchecker.com","identityType":"https","attestations":[{"type":"Web-Bot-Auth-JWKS","uri":"https://lab.ucpchecker.com/.well-known/http-message-signatures-directory","mediaType":"application/http-message-signatures-directory+json"},{"type":"UCP-Profile","uri":"https://lab.ucpchecker.com/.well-known/ucp","mediaType":"application/json"}]}}]}

Speed among Custom stores

The profile answered in 383 ms, faster than 50% of the Custom stores we check.