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The Catalog MCP (also called the Commerce MCP) is a hosted MCP server that drops the Nevermined Catalog and Router straight into the tools an AI assistant already has. Point any MCP host — Claude, ChatGPT, Cursor, a generic MCP client — at it, and your agent can discover paid services in the Nevermined Catalog and pay for them through the Router, all from a budget you cap. No code, no per-vendor signup: the server holds no funds and stores no state, and every payment draws on the caller’s own spend-capped Delegation.
This is the buyer side, packaged as MCP tools. If you instead want to put a paywall on your own MCP server so its tools get paid, that’s the seller side — see MCP Integration. The Docs MCP is a third, unrelated server that streams this documentation into your IDE.
The full guide lives in the MCP section: Catalog MCP Overview. It covers how to import the server into any harness, Claude or ChatGPT; authentication; the walkthrough quickstart; and the complete tool surface — with a reference page per tool. This page is the short introduction and the video.

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See it in action

Claude, ChatGPT and a LangSmith Fleet agent each buy real services from a $5 budget approved once — recorded on live, with real money.

One-assistant walkthroughs, each showing that product’s configuration in full: Claude · ChatGPT · LangSmith Fleet.

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How it fits: discover, then pay

Discover

list_categories, search_services, and get_service read the Catalog — public, no key. Your agent finds a service and reads its protocol, endpoint, and price.

Pay

pay_service hands the call to the Router, which reads the merchant’s 402, pays it from your Delegation, enforces the cap, and relays the vendor’s response. route_by_intent does both steps in one call.
Your agent never holds a private key, never learns a payment protocol, and never needs an account with the service it just paid. The Router, not the agent, speaks each rail — see How the Router works.

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Get started

Import & authenticate

Instant-setup commands for Claude Code, Cursor, Continue and Claude Desktop, plus the OAuth path for Claude and ChatGPT.

Connect from your assistant

Claude, ChatGPT and LangSmith Fleet, step by step — approve a spending cap once, no API key.

Quickstart (API key)

Connect a host, run a discovery call, then a paid call — end to end.

Every tool, documented

A reference page per tool — arguments, returns, refusals, and a curl to test it.

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Not this MCP

Nevermined ships three MCP servers. Make sure you want this one:

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Next

Catalog MCP Overview (full guide)

Import, auth, quickstart, and the complete tool reference.

Using the Catalog from a harness

The code-free playbook for driving discovery and payment from your agent.

Router: pay

Delegations, the spending cap, the rails, and every refusal code.

Payment ledger

Read back everything your agents have spent, across every protocol.