# Underdog UCP Commerce MCP API

**Canonical:** https://apis.io/apis/underdog/underdog-ucp-commerce/  
**Provider:** Underdog — https://apis.io/providers/underdog/  
**Base URL:** https://underdog.shop/api/ucp/mcp  
**Documentation:** https://underdog.shop/agents.md

Underdog UCP Commerce MCP API is one of 4 APIs that [Underdog](https://apis.io/providers/underdog/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include MCP, Agentic Commerce, Universal Commerce Protocol, Checkout, and Catalog. The published artifact set on APIs.io includes API documentation.

The Universal Commerce Protocol (UCP) shopping service Underdog serves from its own domain. A remote MCP endpoint that answers tools/list anonymously with 13 tools covering catalog search and lookup, cart create/read/update/cancel, checkout create/read/update/complete/cancel, and order lookup. complete_checkout requires an idempotency-key and buyer approval. Merchant profile and supported protocol versions are published at https://underdog.shop/.well-known/ucp.

## Machine-readable artifacts (5)

- **MCPServer** — https://raw.githubusercontent.com/api-evangelist/underdog/refs/heads/main/mcp/underdog-mcp.yml
- **ToolCrosswalk** — https://raw.githubusercontent.com/api-evangelist/underdog/refs/heads/main/mcp/underdog-tool-crosswalk.yml
- **Documentation** — https://underdog.shop/agents.md
- **Specification** — https://ucp.dev/2026-04-08/specification/overview/
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/underdog/refs/heads/main/apis.yml

## Other Underdog APIs (3)

- [Underdog Storefront GraphQL API](https://apis.io/apis/underdog/underdog-storefront-graphql/)
- [Underdog Storefront Policy MCP API](https://apis.io/apis/underdog/underdog-storefront-mcp/)
- [Underdog Storefront JSON Endpoints](https://apis.io/apis/underdog/underdog-storefront-json/)

## Tags

MCP, Agentic Commerce, Universal Commerce Protocol, Checkout, Catalog

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/underdog/underdog-ucp-commerce/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/underdog/.