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

It means vessi.com publishes a valid UCP manifest at /.well-known/ucp, the manifest 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 vessi.com for AI agent purchases?

Verification means the store is technically ready — payment handlers declared, transports reachable, schema valid. It doesn't grade business reputation or fulfilment quality. For trust on the commerce side itself, check the store's own reviews. For trust on the agent integration side, this page is the source of truth.

What platform does vessi.com use for UCP?

Our detection identifies vessi.com as running on Shopify. 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 manifest declares.

How was this UCP report for vessi.com generated?

Our crawler fetches vessi.com/.well-known/ucp directly, parses the manifest against the official UCP JSON schema, checks robots.txt for AI bot policies, and runs payment-handler validation. No manual review, no opinions — just what the manifest actually says. The check ran 3 hours ago.

How often is vessi.com re-checked?

Every domain in our directory is re-crawled at least every 24 hours. You can also trigger a fresh check from this page at any time, or subscribe to alerts to get notified the moment the status changes — that's how we built the only continuously updated UCP directory on the internet.

Why does this status matter?

Universal Commerce Protocol is the standard AI shopping agents (ChatGPT, Claude, Gemini, Apple Intelligence) use to discover what a store sells, how to add items to a cart, and how to check out. If a store isn't UCP-verified, agents can still scrape it — but they'll be slower, less reliable, and far more likely to fail at checkout. UCP turns a guess into a guarantee.

Back to status

UCP Score

UCP Score for vessi.com

UCP conformance score, top priorities, impact & effort matrix, and copy-paste fixes for every issue.

✓Verified

A97/100

Analyzed Oct 1, 2026 · 1 recommendation ·Shopify · v2026-08-25 latest

/ 100

UCP Conformance Score

vessi.com publishes a conforming manifest with broad capability coverage.

Agent Discovery100

UCP Conformance93

Capability Coverage100

Working

Agent Discovery is solid (100/100).

Start Here

Publish keys at the manifest root

Top Priorities

Publish keys at the manifest root

Agents have nothing to verify your responses against.

Medium impact Medium effort

Impact & Effort Matrix

Prioritised recommendations by expected impact and implementation effort

Quick Wins(0)

High impact, low effort

No items

Strategic Investments(0)

High impact, high effort

No items

Incremental Gains(1)

Medium impact & effort

Publish keys at the manifest root

Consider Later(0)

Lower priority

No items

How you compare on Shopify

Response time benchmarked against 10,680 Shopifies we monitor.

fastShopify median 165msslow

Your store

160ms

Shopify percentile

Above median

Faster than 57% of Shopify stores

Cohort range

150–184ms

p25 to p75 (middle half)

Recommendations

All improvements ranked by priority, with evidence and actionable fixes.

Publish keys at the manifest root

Medium impact Medium effort

Agents have nothing to verify your responses against.

Why it matters

Signing keys let agents check that checkout responses really came from you. Tokenized payment flows in v2026-04-08+ require them. Since 2026-07-12 the spec expects a root-level "keys" list (the older "signing_keys" field is still accepted while stores move). Stores that hand the buyer a checkout link instead of taking payment through the agent can go without them for now.

Show fix

Generate an Ed25519 keypair, publish the public key as a JWK in a root-level "keys" array (the canonical field since spec PR #566; "signing_keys" is legacy). Rotate annually; keep "kid" stable across rotations of the same key.

{
  "keys": [
    {
      "kty": "OKP",
      "crv": "Ed25519",
      "x": "<base64url-encoded-public-key>",
      "kid": "key-2026-04",
      "alg": "EdDSA"
    }
  ],
  "ucp": { ... }
}

UCP_MISSING_SIGNING_KEYS

Full Check Breakdown

Every signal we evaluate, grouped by category.

Functional probes ran Sep 21, 2026. Transport and URL resolution rows may be stale. Run a fresh check to re-probe.

Agent Discovery8/8 passed

Can AI agents find your store and its UCP manifest?

HTTPSCore

Manifest served over a secure connection.

Manifest URL uses https://

Why it matters
Agents reject non-HTTPS endpoints outright. Signed payloads over HTTP are meaningless because the channel itself is tamperable.
UCP manifest reachableCore

Manifest fetched OK from /.well-known/ucp.

HTTP 200

Why it matters
Agents start every session by fetching this URL. If it 404s or times out, the store is invisible to agent commerce.
AI bot accessCore

robots.txt allows agent crawlers to fetch the manifest.

robots.txt allows /.well-known/ucp

Why it matters
Agents respect robots.txt. Even a published manifest gets ignored if the file is disallowed for known agent user-agents.
llms.txtExperimental

Hand-written brief at /llms.txt for AI agents.

Found at /llms.txt

Why it matters
Emerging convention (analogous to robots.txt). Recommendation/discovery agents read it for brand context, return policy, and crawl preferences.
sitemap.xmlCore

XML sitemap published at /sitemap.xml.

Found at /sitemap.xml

Why it matters
Tells agents which pages are canonical and how often they change. Without it, agents fall back to following internal links.
Open Graph tagsCore

OG meta tags on the homepage.

og:title and og:type/url present

Why it matters
OG tags drive how your store unfurls in agent surfaces, Slack, iMessage, and ChatGPT shares.
Organization schema (JSON-LD)Core

Schema.org Organization (or OnlineStore) JSON-LD on homepage.

Organization-typed JSON-LD detected

Why it matters
Gives agents a structured representation of your brand identity — used to verify you are who your manifest claims you are.
Mobile viewport metaCore

Viewport meta tag for mobile rendering.

<meta name="viewport"> present

Why it matters
Mobile agent sessions render in browser sandboxes that respect this. Without it, screenshots taken by agents are unreadable.

UCP Conformance4/5 passed

Does your manifest meet the published spec?

Manifest passes schema validationCore

Manifest structure conforms to the published UCP spec.

No structural errors

Why it matters
Strict UCP agents reject manifests with structural errors. The error code in the diagnostic shows which field failed.
Protocol version present and well-formedCore

ucp.version follows YYYY-MM-DD format.

Version: 2026-08-25

Why it matters
UCP versions are dates, not semver. Agents pick the closest matching schema based on this string.
Signing keys publishedCore

Root-level keys array (canonical since 2026-07-12; legacy signing_keys also accepted) for response verification.

No signing_keys at root (common for managed/redirect-checkout stores)

Why it matters
Required for tokenized payment flows in v2026-04-08+. Stores using checkout-link redirects (e.g. WooCommerce native) often skip this safely.
No validation warningsCore

Manifest passes structural and field-level rules.

No outstanding validation issues

Why it matters
Each warning is a strict-spec deviation — the recommendations section above lists them with copy-code fixes.
Spec & schema URLs resolve (25)Core

Resolves the 25 spec/schema URLs declared across the manifest to confirm agents can fetch each one.

All 25 URLs resolved.

Why it matters
Spec and schema URLs let agents validate request/response shapes before sending. Broken URLs degrade runtime validation to "best effort" and cause strict agents to refuse the capability entirely.

Capability Coverage5/5 passed

What operations can agents actually perform?

Capabilities declaredCore

Number of agent-readable capabilities under ucp.capabilities.

5 capabilities detected

Why it matters
Capabilities tell agents what operations to attempt. More coverage = more sessions complete end-to-end without falling back to scraping.
Checkout capabilityCore

Store declares a checkout-namespaced capability.

dev.ucp.shopping.checkout detected

Why it matters
Without a checkout capability, agents can browse but can't complete a purchase end-to-end.
Transports declaredInterop

Service transports (REST/MCP/A2A/Embedded) declared on services.

MCP, EMBEDDED

Why it matters
Transports tell agents how to actually call your endpoints. MCP and REST are the most widely supported today.
Payment handlersCore

Tokenized payment handlers registered for in-conversation checkout.

3 handlers registered

Why it matters
Tokenized payment lets agents complete purchases without redirecting the buyer to a hosted checkout. Empty by design is valid for WooCommerce-style native checkouts.
MCP transport reachableInterop

Live reachability check against https://vessi-footwear.myshopify.com/api/ucp/mcp.

tools/list returned a JSON-RPC response in 425ms

Why it matters
A declared transport that does not respond means agents will hit a dead end the moment they try to use the capability — even if the manifest itself looks perfect.

/llms.txt content

The plain-text brief this store publishes to AI agents. Captured on the most recent check.

4.9 KB8383ccbdb7249446

# Vessi
> Vessi makes 100% waterproof footwear using patented Dyma-tex™ knit technology. Lightweight, vegan, PFAS-free, and breathable — designed to keep your feet dry in rain, slush, and light snow without sacrificing style or comfort.
## Collections
### Women's
- [Women's Waterproof Shoes](https://vessi.com/collections/women): Full range of women's waterproof sneakers, boots, and everyday shoes
- [Women's Everyday](https://vessi.com/collections/everyday): Versatile waterproof shoes for daily wear
- [Women's Weekend](https://vessi.com/collections/the-weekend-collection): Casual weekend styles built for comfort and weather protection
- [Women's Active](https://vessi.com/collections/active): Performance waterproof shoes for outdoor activities and fitness
- [Women's Work](https://vessi.com/collections/work): Professional waterproof shoes suitable for the office
- [Women's Travel](https://vessi.com/collections/travel): Lightweight, packable waterproof shoes ideal for travel
- [Women's City](https://vessi.com/collections/city): Urban waterproof sneakers for city life
### Men's
- [Men's Waterproof Shoes](https://vessi.com/collections/men): Full range of men's waterproof sneakers, boots, and everyday shoes
- [Men's Everyday](https://vessi.com/collections/everyday): Versatile waterproof shoes for daily wear
- [Men's Weekend](https://vessi.com/collections/the-weekend-collection): Casual weekend styles built for comfort and weather protection
- [Men's Active](https://vessi.com/collections/active): Performance waterproof shoes for outdoor activities and fitness
- [Men's Work](https://vessi.com/collections/work): Professional waterproof shoes suitable for the office
- [Men's Travel](https://vessi.com/collections/travel): Lightweight, packable waterproof shoes ideal for travel
- [Men's City](https://vessi.com/collections/city): Urban waterproof sneakers for city life
### Stormburst
- [Stormburst Collection](https://vessi.com/collections/stormburst-collection): Stormburst high and low top waterproof shoes
### Sale
- [Sale](https://vessi.com/collections/sale): Discounted waterproof shoes and accessories
### Accessories & Apparel
- [Accessories](https://vessi.com/collections/accessories): Waterproof accessories including socks, insoles, and laces
- [Apparel](https://vessi.com/collections/apparel): Vessi branded apparel
## Pages
### About
- [Our Story](https://vessi.com/pages/our-story): Brand story and founding
- [About Us](https://vessi.com/pages/about-us): Company information and brand values
- [Innovation](https://vessi.com/pages/innovation): Dyma-tex™ waterproof technology explained
- [Sustainability](https://vessi.com/pages/sustainability): Environmental impact commitment
### Support
- [Help Centre](https://vessi.com/pages/help-centre): FAQ and sizing guide
- [Warranty](https://vessi.com/pages/warranty): 365-day waterproof guarantee
- [Shoe Cleaning Guide](https://vessi.com/pages/cleaning-shoes): How to clean and care for your Vessi shoes
- [Returns & Exchanges](https://vessi.com/pages/returnsandexchanges): Return and exchange policy
- [Store Locator](https://vessi.com/pages/store-locator): Find Vessi retail locations
- [Contact](https://vessi.com/pages/contact): Customer service and support
## Blog
- [The Forecast](https://vessi.com/blogs/the-forecast): Styling guides, shoe care tips, product updates, and waterproof footwear advice
## Technology
Vessi's patented Dyma-tex™ knit is a single-layer waterproof membrane woven directly into the shoe upper. Unlike traditional waterproof shoes that use bulky rubber or Gore-Tex liners, Dyma-tex™ keeps the shoe lightweight (as low as 200g per shoe) and breathable while maintaining 100% waterproof protection. Every Vessi shoe is PFAS-free and fully vegan.
## FAQ
- **Are Vessi shoes waterproof?** Yes. Every Vessi shoe uses patented Dyma-tex technology for 100% waterproof protection in rain, slush, and light snow.
- **Are Vessi shoes vegan?** Yes. All Vessi footwear is made with 100% vegan materials — no leather, suede, wool, or animal-derived glues.
- **Are Vessi shoes PFAS-free?** Yes. Vessi uses no per- and polyfluoroalkyl substances (PFAS) in its waterproofing process.
- **Can you machine wash Vessi shoes?** Only the Weekend Classic style is machine washable (cold, gentle cycle, air dry). All other styles should be hand-cleaned.
- **Where is Vessi based?** Vessi was founded in Vancouver, Canada.
- **Do Vessi shoes run true to size?** Generally yes. Most customers find Vessi shoes true to size. Those between sizes or with wider feet may prefer to size up.
- **Does Vessi offer free shipping?** Vessi offers free shipping on orders over a minimum threshold.
- **What is Vessi's waterproof guarantee?** Vessi backs every pair with a 365-day waterproof guarantee. If your shoes leak within the first year, Vessi will replace them.
- **Can I return or exchange my Vessi shoes?** Yes. See the [Returns & Exchanges page](https://vessi.com/pages/returnsandexchanges) for full policy details including timelines and conditions.

View source ↗

Capabilities Detected

UCP capabilities supported by this endpoint
Cart ✓ Bound	2026-08-25
Order Management ✓ Bound	2026-08-25
Checkout ✓ Bound	2026-08-25
Discount Extension ✓ Bound	2026-08-25
Fulfillment Extension ✓ Bound	2026-08-25
Permalink ✓ Bound	2026-08-25
Identity Linking ✓ Bound	2026-08-25
Catalog Lookup ✓ Bound	2026-08-25
Catalog Search ✓ Bound	2026-08-25
Dev Shopify Catalog Extension ✓ Bound	2026-08-25

Technical Vitals

Technical details for this UCP endpoint
UCP Status	Verified
Endpoint	https://vessi.com/.well-known/ucp
HTTP Status	200
UCP Version	2026-08-25
Transports	MCP, EMBEDDED
Last Observed	2026-10-01T19:20:14+00:00
Last Full Index	Oct 1, 2026 7:20 PM UTC

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