Checkout Registry

Name: Checkout Registry — checkout agents in agentic commerce
Creator: Checkout Registry

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Registry

6 checkout agents · click a row to expand

#	Agent	Coverage	Execution	Protocols	Status	Verification
01	CartAI CartAI	Universal	Browser	REST	Live	claimed
websitewww.cartai.ai docsdocs.cartai.ai/ coverageUniversal — any web property ↗ executionHeadless browser automation (async, background) ↗ paymentCaller passes payment creds; retailer is merchant of record ↗ authCaller-supplied customer + payment credentials ↗ protocolsREST (POST /checkout) + webhooks ↗ discoveryCaller supplies product URL ↗ returnsnot stated regionsnot stated pricingTransaction fee (not detailed) sandboxYes (sandbox: true) ↗ statusLive ↗
02	Agentic Checkout Crossmint	Universal +	API + Browser	x402MPP	Live	claimed
websitewww.crossmint.com/products/agentic-checkout docsdocs.crossmint.com/solutions/ai-agents/introduction coverageAmazon, Shopify, 1B+ products, flights; + any site via browser ↗ executionFast Checkout (single API call) + browser automation ↗ paymentCrossmint issues virtual cards / wallet / stablecoin; spending rules ↗ authAgent identity + card verification ceremony ↗ protocolsx402, MPP, EVM wallets; Visa VIC, Mastercard Agent Pay ↗ discoveryCaller supplies product (API-driven) ↗ returnsYes — order refunds supported ↗ regionsGlobal (with restricted countries) ↗ pricingPer-transaction, tiered by volume; convenience fee typically charged to users (rates via sales) ↗ sandboxYes (staging, USDXM testnet) ↗ statusLive ↗
03	Firmly.ai Firmly	11M+ merchants	API	UCPACPMCPAP2	Live	claimed
websitewww.firmly.ai docsdevelopers.firmly.ai/introduction coverage11M+ merchants / $900B+ GMV via one integration (Shopify, BigCommerce, Magento); 32K products live ↗ executionCart API + 1-Step Checkout (single integration) ↗ paymentCompletes checkout with encrypted payment; Klarna express; PCI-compliant ↗ authAccess token for Cart API (backend) ↗ protocolsUCP, ACP, MCP, AP2, TAP ↗ discoveryBuilt-in product search across merchant catalogs ↗ returnsYes — exposes returns/refunds status from the merchant ↗ regionsnot stated pricingnot stated sandboxnot stated statusLive ↗
04	Henry Henry Labs	Multi-merchant	SDK	REST	Live	claimed
websitewww.henrylabs.ai docsdocs.henrylabs.ai/ coverageMulti-merchant (with per-merchant success rate + latency) ↗ executionSDK/REST; async default or sync (≤30s); headless or hosted frame ↗ paymentCard tokenization via isolated iframe ↗ authAPI key (server-side) ↗ protocolsREST + JS SDK + webhooks ↗ discoveryBuilt-in text & image product search ↗ returnsnot stated regionsnot stated pricingPer-request credits, tiered plans ↗ sandboxYes (test cards) ↗ statusLive (updated 02/2026) ↗
05	Universal Checkout API Rye	Universal	Browser	ACPUCP	Live	claimed
websiterye.com/products/universal-checkout-api docsrye.com/docs coverageUniversal — any product URL, ~15,000+ merchants ↗ executionBrowser automation; no merchant integration required ↗ paymentCaller supplies tokenized payment; Rye handles pricing/tax/shipping/order ↗ authAPI key (Basic auth) ↗ protocolsREST; ACP, UCP (claimed on site) ↗ discoveryCaller supplies product URL ↗ returnsYes — open a return against a completed order, track to refund ↗ regionsUS primary ↗ pricingDeveloper $149/mo ($50 free credits, $0.05/order, $0.02/product fetch, no markup on platform costs); Enterprise custom ↗ sandboxYes (staging.api.rye.com) ↗ statusLive ↗
06	Zinc API Zinc	50+ retailers	API	RESTMPP	Live	claimed
websitewww.zinc.com docswww.zinc.com/docs coverageAmazon, Walmart, Target, Best Buy + 50; global retailers ↗ executionProgrammatic order automation ↗ paymentPrepaid balance, Stripe Connect, or Machine Payments Protocol ↗ authAPI key ↗ protocolsREST; Machine Payments Protocol (HTTP 402) ↗ discoveryBuilt-in product search + details ↗ returnsYes — return requests supported ↗ regionsGlobal ↗ pricingPer-order fee (drawn from balance) ↗ sandboxYes ↗ statusLive (v2 API, spec 2026-06) ↗

Every capability is claimed from the vendor's own docs. Verified means we ran it ourselves — verification in progress.

The benchmark

coming soon

What we test

Every agent runs against the same frozen set of storefronts we control — Shopify, WooCommerce, headless, and one deliberately hostile checkout. Reproducible, no real money, no merchant ToS exposure. A rotating hidden holdout keeps anyone from optimizing to the test.

Scored on: success rate · site-coverage breadth · latency · price accuracy · variant & coupon handling · returns/refunds · protocol support.

Verified vs. claimed

Every capability carries a marker for how we know it:

verified tested by us against the suite
claimed stated in docs, not yet run
spec / unverified no runnable agent

Agent-readable

available as JSON, JSON-LD, and llms.txt

JSON API

Every row on this page is a static, crawlable record and a JSON endpoint. No auth to read.

# the registry, machine-readable
$ curl https://checkoutregistry.com/api/v1/agents

{
  "registry": "Checkout Registry",
  "count": 6,
  "agents": [
    { "vendor": "Rye", "verification": "claimed",
      "capabilities": { "coverage": "Universal — any product URL", ... } },
    ...
  ]
}

Built for LLM discovery

Structured data in the markup, plus a JSON API and an agent guide at the root:

# structured data, in the served HTML
‹script type="application/ld+json"›
  "@type": "Dataset"
‹/script›

# machine-readable, at the root
GET /api/v1/agents
GET /llms.txt

The registry is served as static HTML and JSON, so a model fetching this page reads all 6 listings straight from the markup.

FAQ

What is a checkout agent?

Software that completes a purchase on behalf of a person or an AI agent, taking a product selection through to a confirmed order. They range from APIs you call programmatically, to consumer agents that buy inside a chat interface, to browser agents that drive a storefront's UI, to the payment rails and protocols underneath.

What is Checkout Registry?

An independent registry of agentic checkout infrastructure — the buy-side APIs that complete a purchase at a merchant, callable from any app or agent (not just AI). It tracks each one's vendor, capabilities, protocols, and auth, sourced from their own docs, with independent testing planned. It deliberately excludes consumer shopping surfaces, general browser agents, and merchant platforms.

How are capabilities verified?

Every agent runs against the same frozen set of storefronts we control — Shopify, WooCommerce, headless, and a deliberately hostile checkout. Runs are reproducible, use no real money, and carry no merchant ToS exposure. A rotating hidden holdout keeps agents from optimizing to the test.

What do "verified" and "claimed" mean?

Verified means we tested the capability against our suite. Claimed means it is stated in the vendor's documentation but not yet run. Spec / unverified means there is no runnable agent to test. Every capability in the registry carries one of these markers.

Which protocols does the registry track?

Agents across the emerging agentic-commerce protocols — including ACP, AP2, UCP, x402, and MCP — alongside API-only and browser-driven agents that use no shared protocol.

How do I get an agent listed?

Agent submission opens soon. Once it is live, you can submit an agent to be indexed and verified against the public benchmark.

Is the registry free to access?

Yes. Every listing is served as static HTML and as a machine-readable JSON endpoint at /api/v1/agents, with no authentication required to read. An llms.txt is also available for AI agents.

Run a checkout agent?

Submit it to the registry. Get your capabilities verified against the public benchmark.