Developer Tools

Mastercard Verifiable Intent

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Security

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.

UCP Checker Extension

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Browser Extension

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.

UCP Conformance Tests

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Validator

Official conformance test suite for validating UCP protocol compliance. Run automated checks against any UCP endpoint to verify spec adherence.

UCP JavaScript SDK

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Library

The official JavaScript/TypeScript SDK for UCP. Build UCP clients and MCP transport integrations with full type definitions.

UCP Playground

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Developer Tools

Open testing and benchmarking environment for UCP-enabled AI agent commerce. Benchmark 11 AI models shopping real stores via MCP, REST, and ECP transports. Compare Claude, GPT, Gemini, Grok, DeepSeek, and Llama checkout rates, run multi-turn evaluations, share session replays, audit store UCP compliance, and debug integrations with full protocol visibility.

UCP Python SDK

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Library

The official Python library for UCP with Pydantic models. Build UCP clients and servers in Python with type-safe request/response handling.

UCP Samples

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Examples

Official sample implementations and examples for the Universal Commerce Protocol. Reference code for building UCP endpoints across different platforms and languages.

UCP Schema

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Schema

Official JSON schema definitions for UCP protocol messages and payloads. Use for validation, code generation, and IDE support.

UCP Specification

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Specification

The official Universal Commerce Protocol specification repository. Defines the protocol standard, endpoint structure, capability declarations, and transport mechanisms.

UCPChecker

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Developer Tools

UCP Checker crawls .well-known/ucp manifests to verify whether merchants are agent-ready for agentic commerce. It provides real-time verification with public status pages, embeddable badges, a browser extension, and a full MCP server with 10 tools including cross-store product search, cart building, and checkout. AI agents can discover verified stores, browse catalogs, compare products, and complete purchases across any UCP-enabled merchant.

WooCommerce UCP Adapter

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Plugin

WordPress plugin providing REST API endpoints for Universal Commerce Protocol integration with WooCommerce stores. Enables secure, standardized API communication for AI agent commerce.