Outer

Outer UCP Shopping (MCP)

The Universal Commerce Protocol shopping service Outer's storefront exposes over MCP, advertised in the merchant profile at https://liveouter.com/.well-known/ucp. It carries the dev.ucp.shopping service with catalog search and lookup, cart, checkout, fulfillment, discount and order capabilities, plus Google Pay, Shopify Card and Shop Pay payment handlers. tools/list is not anonymous: the endpoint answers HTTP 422 invalid_profile_url until the calling agent supplies a resolvable UCP agent profile URI, so live tool input schemas require a registered agent identity. The tool names recorded in mcp/outer-mcp.yml are the ones Outer publishes in its own /llms.txt.

GitHub

Documentation

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Authentication
https://raw.githubusercontent.com/api-evangelist/outer/refs/heads/main/authentication/outer-authentication.yml

Other Resources

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MCPServer
https://raw.githubusercontent.com/api-evangelist/outer/refs/heads/main/mcp/outer-mcp.yml
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LLMsTxt
https://raw.githubusercontent.com/api-evangelist/outer/refs/heads/main/llms/outer-llms.txt
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OAuthScopes
https://raw.githubusercontent.com/api-evangelist/outer/refs/heads/main/scopes/outer-scopes.yml
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APIsJSON
https://raw.githubusercontent.com/api-evangelist/outer/refs/heads/main/apis.yml

API entry from apis.yml

apis.yml Raw ↑ 
aid: outer:ucp-shopping
name: Outer UCP Shopping (MCP)
description: 'The Universal Commerce Protocol shopping service Outer''s storefront exposes over MCP, advertised
  in the merchant profile at https://liveouter.com/.well-known/ucp. It carries the dev.ucp.shopping service
  with catalog search and lookup, cart, checkout, fulfillment, discount and order capabilities, plus Google
  Pay, Shopify Card and Shop Pay payment handlers. tools/list is not anonymous: the endpoint answers HTTP
  422 invalid_profile_url until the calling agent supplies a resolvable UCP agent profile URI, so live
  tool input schemas require a registered agent identity. The tool names recorded in mcp/outer-mcp.yml
  are the ones Outer publishes in its own /llms.txt.'
humanURL: https://liveouter.com/llms.txt
baseURL: https://liveouter.com/api/ucp/mcp
tags:
- Agentic Commerce
- MCP
- Universal Commerce Protocol
- E-Commerce
properties:
- type: MCPServer
  url: mcp/outer-mcp.yml
- type: LLMsTxt
  url: llms/outer-llms.txt
- type: Authentication
  url: authentication/outer-authentication.yml
- type: OAuthScopes
  url: scopes/outer-scopes.yml