MCP servers · UCP — Universal Commerce Protocol · MCP server + skill
Connect Claude Code to UCP — Universal Commerce Protocol
One line gives Claude Code your UCP — Universal Commerce Protocol account as tools: 3 endpoints, list offers, create checkout, get download link, called with your own connection. No key in the prompt, a receipt for every call, revoke Claude Code's access alone any time.
Three steps
- Create a free 0n3 account and connect UCP — Universal Commerce Protocol. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into Claude Code. The terminal agent. One command, then every connection you hold is a tool in your shell. The skill file teaches it how 0n3 works.
- Ask Claude Code: whoami. Then: "List offers in UCP — Universal Commerce Protocol".
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"
The line above carries a placeholder; 0n3.app/install mints a real key named for Claude Code and fills it in.
What Claude Code can then do in UCP — Universal Commerce Protocol
List offers · List all active products, downloads, and plans1
List offers
GET /api/commerce/offersCreate checkout · Generate a Stripe Checkout session for a product slug1
Create a checkout
POST /api/commerce/checkoutGet download link · Verify entitlement and return a signed download URL1
Get a download link
GET /api/commerce/downloadList purchases · List the user's completed purchases0
List the user's completed purchases
UCP — Universal Commerce Protocol in other AI clients
Claude (desktop & claude.ai) + UCP — Universal Commerce ProtocolconnectorChatGPT + UCP — Universal Commerce Protocolconnector · GPT actionCodex CLI + UCP — Universal Commerce ProtocolMCP serverGemini CLI + UCP — Universal Commerce ProtocolMCP serverCursor + UCP — Universal Commerce ProtocolMCP serverVS Code (Copilot) + UCP — Universal Commerce ProtocolMCP serverWindsurf + UCP — Universal Commerce ProtocolMCP server