Quick answer: Smithery and Powerduck both touch MCP hosting, but from opposite directions. Smithery is a registry and gateway: a large catalog of community and third-party servers, one-click connection, and managed OAuth and credentials. Powerduck is a generator: it compiles your OpenAPI contract into a runnable MCP server, shows which operation produced each tool, and hosts that server next to your documentation. Use a registry when you want to discover and connect to someone else's service; use a generator when the service is yours and the tools must stay in sync with the contract.
This page compares the two honestly, including the limits and the lock-in, and links to the focused guides. Start with the table, then read the sections that match whether you are consuming a service or publishing your own.
The two at a glance
| Capability | Smithery | Powerduck |
|---|---|---|
| Primary role | MCP registry + gateway | MCP server generator + host |
| Where tools come from | Community / vendor catalog | Compiled from your OpenAPI file |
| Tool-to-operation provenance | Depends on the author | Every tool traces to an operation and schema |
| Managed OAuth / credentials | Yes, core feature | Local transports; Hub hosting |
| API documentation | Not the focus | Hosted from the same spec |
| Free tier | Hobby, limited namespaces, per-call tier | Desktop and Hub hosting free within plan limits |
| Works with local files | Cloud-oriented | Yes, local-first, no account |
| Best for | Discovering and connecting services | Publishing your API as correct, synced tools |
A registry answers a different question
When you need your agent to talk to GitHub, Linear, or a database, a registry is the fastest path: search, connect, authorize once, and the gateway handles credentials and sessions. That is a real and well-solved problem. But it does not help when the API you need to expose is the one you are building. There is no catalog entry for your own backend, and there should not be — its tools change every time your contract changes. That is the distinction drawn in generate an MCP server from OpenAPI vs pulling one from a registry, and the workflow tradeoffs are in an MCP registry vs a local-first MCP workflow.
Provenance is the difference between tools and a black box
When a server is generated from your spec, you can see exactly which OpenAPI operation, operationId, and schema produced each tool, and — just as important — which operations were skipped because their metadata was incomplete. Missing metadata is surfaced instead of silently producing a weak tool. A catalog server is opaque by comparison: you trust the author. Why this matters for a service you own is in OpenAPI MCP provenance and why skipped tools matter.
OAuth, hosting, and where the free tier runs out
Smithery's managed OAuth and credential handling are the reason to use it for third-party services, and the free Hobby tier is limited in namespaces and metered per call. Powerduck keeps the work local-first and hosts docs and MCP together on the Hub within plan limits, so the documentation and the tools are never out of sync. The side-by-side on free limits is in free MCP hosting limits compared, and the auth tradeoffs are in MCP server OAuth: Smithery vs Powerduck.
Publishing your own server without a registry
You do not need a registry to expose your own API. Keep the spec in your repo, generate the server, and run it over a local stdio or HTTP transport for development, or host it for remote agents. The steps are in how to publish an MCP server without a registry, and the choice between running it yourself and sitting behind a gateway is in self-hosted MCP vs a Smithery gateway.
Where to go next
Powerduck is the local-first way to turn your own OpenAPI contract into correct, hosted agent tools; a registry remains the right tool for connecting to everyone else's. See it on the Powerduck homepage. For the wider picture, read the MCP server guide and the OpenAPI guide.
Frequently asked questions
Should I publish my own API on Smithery or generate it with Powerduck?
If the tools must stay in sync with a contract you actively change, generate them with Powerduck. You can still list a generated server in a registry later for discovery; the two are not mutually exclusive.
Does Powerduck manage OAuth like Smithery?
Powerduck focuses on local transports and Hub hosting rather than a third-party credential gateway. For connecting to third-party services that need managed OAuth, a gateway such as Smithery is the better fit.
Is the free tier enough to host a production MCP server?
It depends on call volume and namespaces. Both platforms meter or limit the free tier; check the current limits against your expected traffic before relying on either for production.
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