mcp.nexlab.net is a marketplace and billing gateway for Model Context Protocol servers. Twenty-three of them run inside a single process and answer on one URL, so an agent gets 200 tools from one connection and one credential instead of twenty-three installations.

Why it exists

The servers were previously reachable only through a third-party marketplace that took a revenue share, imposed a cold start of about ten seconds on every first call, answered 500 where it meant 401, 402 or 404, and silently invalidated active subscriptions whenever a price changed. All of that is avoidable by owning the edge.

What an agent actually gets

• One aggregate endpoint. /mcp serves every server a key can reach, with tools namespaced server__tool. Individual servers stay addressable at /mcp/<slug>.
• OAuth 2.1, properly. Dynamic client registration, PKCE, and RFC 9728 protected-resource metadata. A client that meets a 401 discovers the authorisation server and onboards itself — no shared secret to hand out.
• Errors an agent can act on. 401 for a missing key, 402 for an exhausted quota, 403 for no subscription, 404 for an unknown server, never a blanket 500.
• Two ways to pay. A monthly allowance per server, or a per-call price billed against a prepaid balance held in integer micro-currency. Overspending is opted into, never inherited — an agent in a retry loop cannot quietly drain a balance.
• Reachable over Tor, as a hidden service, for callers who need it.

What the servers cover

Connecting

Any MCP client that speaks Streamable HTTP. Point it at the aggregate endpoint and let it authenticate:

https://mcp.nexlab.net/mcp

A free allowance is granted automatically on the first call, so an agent can try a server before anyone decides to pay for it.

Pricing

€9, €19 or €29 a month per server depending on its size, or metered per call against a prepaid balance. Card, PayPal, Bitcoin, Ethereum and Solana.

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