"Gateway" gets used for two genuinely different pieces of infrastructure, and conflating them leads to evaluating the wrong product against the wrong requirements. One routes and secures traffic to servers that already exist. The other builds and maintains a working copy of your own data. Both matter. They are not substitutes for each other.
What an mcp gateway actually does
An MCP gateway sits between many clients and many servers, typically adding the things a network chokepoint is good at: centralized authentication so individual clients do not each hold credentials for every upstream server, rate limiting, routing, and an audit trail of what was called. The servers behind it keep their own tool names and their own behaviour; the gateway is managing access to them, not replacing what they do.
MintMCP is a clear example of this category. Based on its own documentation, it curates a catalogue of pre-approved MCP servers behind enterprise identity providers using SAML or OIDC, exports audit logs in SOC 2, HIPAA and GDPR-compatible formats, and offers a hosted store of connectors that administrators approve centrally rather than developers configuring locally. It is explicitly governance-first, built for regulated organizations that need to control which of many external servers an agent can reach, and its own positioning is squarely about securing and centralising that access rather than about building a working memory of a company's own data.
Kong's AI Gateway approaches the same broad problem from an existing API gateway product. Its MCP proxy plugin translates between MCP and HTTP, which lets an existing REST API be exposed as an MCP server through Kong rather than rewritten. Its OAuth2.1 plugin secures MCP servers directly, and the platform layers on semantic caching, cross-provider routing and token-based rate limiting that were already part of Kong's AI Gateway product before MCP support was added.
Is Contextely an mcp gateway?
No. This is worth being explicit about because the categories blur easily in conversation. A gateway proxies arbitrary upstream tools under their own names, across potentially many servers you do not operate. Contextely exposes exactly its own fixed catalogue: eight tools covering retrieval, the memory graph and governed writes, documented in full on the docs site. It reads from a source through two named calls per connector (a list and a fetch), and anything beyond that read path is surfaced as a write action that goes through an explicit approval lifecycle, never as a proxied call to an arbitrary upstream tool. Calling that a gateway, or claiming transparent tool proxying, would be a claim this product's own test suite is built to catch and fail.
What a permissioned context layer does instead
A permissioned context layer is not managing access to many external servers. It is building one thing: a continuously refreshed, condensed working memory of a company's own systems of record, with entitlement checked per caller on every retrieval and freshness tracked per object against its own TTL. The problem it solves is not "which of these forty MCP servers may this agent reach," it is "what does this specific person, right now, get to see when they ask this specific question," resolved against data the layer itself keeps current.
| MCP gateway (MintMCP, Kong) | Permissioned context layer | |
|---|---|---|
| Primary job | Route, authenticate and audit calls to many external MCP servers | Hold and serve a permission-aware working memory of your own data |
| Tool surface | Proxies upstream tools under their own names | Exposes its own fixed catalogue only |
| Freshness | Not typically its concern; the upstream server owns that | A first-class property: every object has a TTL and a labelled freshness state |
| Where entitlement is applied | Usually at the connection or server level, via IdP integration | Per call, per record, as a multiplicative factor in ranking |
| Writes | Passed through to whatever the upstream tool does | Held for a required-approval state before anything executes |
Table 1: an mcp gateway and a permissioned context layer, compared on what each one is actually built to do.
"Kong AI Gateway enables you to take any existing Kong-managed REST API and generate a remote MCP server hosted by Kong."
Kong Inc., introducing its enterprise MCP gateway
That capability, turning an existing API into an MCP-shaped surface, is a genuinely different job from resolving what a specific caller may see once a question reaches a data store. Both are real problems. They are solved by different infrastructure, and a team that has stood up a gateway has not thereby solved the second one.
Which one do I actually need?
Ask what you are trying to control. If the honest answer is "we have many MCP servers, from different vendors or teams, and we need one place to authenticate, rate-limit and audit access to all of them," that is a gateway problem, and MintMCP or Kong are built for exactly that. If the honest answer is "we need agents to be able to ask questions about our own company data and get an answer that respects who is asking, kept current without agents hammering our production database," that is a context layer problem, and a gateway sitting in front of it does not solve it on its own; the two can run together, since a context layer is itself just another thing that speaks MCP and could sit behind a gateway like anything else.
Where the two can genuinely sit together
None of this means picking one category rules out the other. A gateway's job, centralised authentication and routing across many external servers, does not go away just because one of those servers happens to be a permissioned context layer rather than a generic tool. A company running MintMCP or Kong in front of a dozen vendor MCP servers could point the same gateway at a context layer too, and the gateway would do exactly what it does for anything else it fronts: authenticate the connection, log the call, apply rate limits. What it would not do is resolve per-record entitlement inside whatever the context layer returns, because that check happens one layer further in, at the data itself, which is precisely the boundary a gateway was never designed to cross.
This is also why "open source mcp gateway" and "self-hosted permissioned context layer" are not competing answers to the same question, even though both show up in the same procurement conversation. The official MCP registry's own maintainers are explicit that its reference implementation is not designed for self-hosting as a general-purpose deployment target, which is a different constraint again from whether a gateway product or a context layer can be run on your own infrastructure. Worth checking each piece of the stack against its own claims rather than assuming a feature true of one layer transfers to the others.
Where the confusion causes real damage
Buying a gateway and expecting it to also solve per-record entitlement on your own data is the most common version of this mistake. A gateway secured with SAML and exporting SOC 2-formatted logs looks, from a compliance checklist, like it has "handled permissions." It has handled access to servers. What a specific person may see inside the results a server returns, and whether that record is still accurate, are questions the gateway was never built to answer, because they live one layer further in, at the record itself rather than at the connection.
If your problem is the first one, MintMCP's and Kong's own documentation is the right starting point, linked above. If it is the second, the MCP pillar page states plainly what Contextely is and is not, /security has the entitlement ordering against the actual code, and /self-host lets you run the same engine on your own hardware to see the difference directly rather than take the comparison on faith.