UCP Specification
EcosystemVerifiedFeaturedThe official Universal Commerce Protocol specification repository maintained by the UCP organization.
This is an open-source developer tool for building UCP integrations. View on GitHub →
The main UCP specification repository contains the protocol definition, service schemas, and documentation for the Universal Commerce Protocol. This is the canonical source of truth for how UCP works.
Why This Matters for UCP
The UCP specification is the foundation of the entire ecosystem, defining how merchants, agents, and payment handlers interoperate.
UCP Capabilities
UCP Endpoint
Ecosystem — Endpoint not yet publicly available
Integration Example
// The UCP spec defines the /.well-known/ucp manifest format:
// {
// "ucp": {
// "version": "2026-01-23",
// "services": { "dev.ucp.shopping": [...] },
// "capabilities": { "dev.ucp.shopping.checkout": [...] },
// "payment_handlers": { "com.google.pay": [...] }
// }
// }Category
Developer ToolsUCP Status
EcosystemTags
Pricing
free
Related Guides
Reviews
★★★★★4.5 (4 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
K. Park
Backend Developer · Feb 18, 2026
The best developer tool in this category. TypeScript types are correct and complete. Error messages actually tell you what went wrong.
E. Garcia
Senior Engineer · Jan 30, 2026
Solid tool. The test suite coverage is excellent. I found one edge case in the payment token validation that the maintainers fixed within 48 hours.
M. Fischer
DevTools Engineer · Mar 8, 2026
Integrated in an afternoon. The discovery endpoint just worked. The CLI flags are well-designed — composable, no magic defaults.
Y. Okonkwo
API Engineer · Feb 25, 2026
Good tool for UCP conformance testing. Runs fast and the output is easy to parse in CI. Would like a JSON output mode — currently only text.
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