MCP servers · .0n App Marketplace · MCP server
Connect Codex CLI to .0n App Marketplace
One line gives Codex CLI your .0n App Marketplace account as tools: 5 endpoints, list apps, install app, checkout app, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.
Three steps
- Create a free 0n3 account and connect .0n App Marketplace. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
- Ask Codex CLI: whoami. Then: "List apps in .0n App Marketplace".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"
Add it to your shell profile so Codex finds it next time.
The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.
What Codex CLI can then do in .0n App Marketplace
List apps · Browse the unified catalog (UCP products + apps)2
List apps
GET /api/widgets/marketplace/catalogList installed
GET /api/marketplace/my-appsInstall app · Install a free app for the current location1
Install app
POST /api/widgets/marketplace/installCheckout app · Stripe checkout for a paid app1
Checkout app
POST /api/widgets/marketplace/checkoutExecute app · Execute an installed .0n app1
Run an app
POST /api/marketplace/execute/{appId}List installed · List apps installed on the current location0
List apps installed on the current location
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