UCP JavaScript SDK

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

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.

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.