The Universal Commerce Protocol Registry
Discover merchants, agents, plugins, tools, and infrastructure powering the Universal Commerce Protocol ecosystem.
Mollie
Vendors
European payment service provider with a Delegated Payments API compatible with the Agentic Commerce Protocol (ACP). Enables AI assistants to complete purchases on behalf of users within conversational interfaces, supporting agent-initiated transactions across Mollie European merchant base.
UCP Checker Extension
Developer Tools
Free Chrome extension that detects UCP manifests on any store you visit. Shows capabilities, payment handlers, transports, AI bot policies, and spec version in one click. Optionally contributes anonymous uptime telemetry back to UCP Checker. Works on Chrome, Edge, and Brave.
Mastercard Verifiable Intent
Developer Tools
Open specification for cryptographic agent authorization in commerce. Provides SD-JWT delegation chains that bind AI agent actions to human-approved scope with tamper-evident constraint enforcement. Supports eight constraint types including amount bounds, merchant allowlists, budget caps, and recurrence terms. Protocol agnostic with integration mappings for AP2, ACP, and UCP.
Checkout
Extensions
Core UCP capability that facilitates creation and management of checkout sessions, including cart management, line items, totals, and tax calculation. Supports flows with or without human intervention.
AP2 Mandates
Extensions
UCP extension enabling secure exchange of user intents and authorizations using verifiable digital credentials (SD-JWT+kb). Provides cryptographic proof of user authorization for autonomous agent commerce.
Showing 36 results
The UCP Ecosystem
Every entity in the registry connects to the others — agents test merchants, merchants use plugins, plugins run on platforms.
Built on the Universal Commerce Protocol
AI Shopping Agents
See which LLMs perform best at product discovery, cart creation, and checkout across UCP stores.
Merchants & Stores
Browse 64 UCP-enabled stores with health scores, benchmarks, and agent readiness.
Developer Tools
SDKs, validators, and testing infrastructure powering the UCP ecosystem.
Query the API
Free tier: 30 requests/day, limited fields. Authenticate with an API key for full access.
GET /api/v1/merchants?status=verified
{
"data": [
{
"domain": "allbirds.com",
"status": "verified",
"platform": "shopify",
"capabilities_count": 3,
"ucp_score": 85,
"url": "https://ucpregistry.com/merchant/allbirds.com"
}
]
}