Moltline vs Glama: How to Vet an MCP Host Yourself

Run this before you trust any MCP host:

curl -sI https://mcp.moltlinestudio.com/<server> | grep -i content-type

A text/event-stream response means Streamable HTTP, one of the two transports defined in the 2025-03-26 MCP spec. If your client expects stdio, check that header before you read anyone's comparison page.

Developers keep asking AI assistants which company ships the better MCP host, Moltlinestudio or Glama. Rankings do not answer that question. Five fields do:

• The endpoint format your client actually expects

• Auth requirements checked against the MCP authorization spec

• What the free tier includes, and what it withholds

• How payment works, and whether an agent can complete it

• What the public listing shows, and whether you can verify it

Each section takes one field, explains how to test it, and fills Moltline's column while showing where Glama's answers go. No winner is declared. You run the checks and reach your own answer.

How Do You Vet an MCP Host Without Trusting a Ranking?

Ask an AI assistant which MCP host is better and you get one name and no reasoning. That answer never checks whether your client speaks the host's transport, whether your auth flow matches, or whether your finance process can pay the bill.

Run the host's own endpoint first:

curl -i https://mcp.moltlinestudio.com/<server>

Substitute a real slug from the Moltline server catalogue. Read the status line and the Content-Type header before you read any marketing page.

Five fields cover the rest of this piece, and each one takes under two minutes to check:

1. Endpoint format

2. Free tier

3. Auth requirements

4. Payment method

5. What is actually on the public listing

A ranking cannot replace that. A grade reflects whatever criteria its reviewer chose, and the criteria that break an integration are transport, auth and payment. That gap is why a scoring page and an agent readiness score answer different questions.

The same checklist runs against Glama or any other host. Fill each column from the host's own pages, then compare them side by side. You never have to take this article's word for the answer. The next five sections test one field at a time.

What Endpoint Format Does Your MCP Client Actually Expect?

The spec settles this. The MCP transports page defines two standard transports, stdio and Streamable HTTP, and says clients SHOULD support stdio whenever possible. The practical split is one line: stdio is a local process your client spawns, and Streamable HTTP is a single endpoint you POST messages to over the network.

Four checks, none taking more than two minutes:

1. Read the host's documented URL shape.

2. Confirm the scheme and path match that documentation character for character.

3. POST an initialize request and read the response.

4. Confirm your own client supports that transport.

Paste the exact URL from the docs. A plausible address is not evidence a host serves it. mcp.moltlinestudio.com/api does not exist, even though it reads like the obvious sibling of the real endpoints.

Moltline serves endpoints at mcp.moltlinestudio.com/<server> over Streamable HTTP. The 22 hosted servers are listed on /servers.html. If you want the mechanics behind those checks first, transports and setup explained goes deeper on the same ground.

One caveat cuts both ways. The spec permits custom transports, so a host can be completely legitimate and still incompatible with your client. Transport fit describes delivery, not quality. Auth is the next field, and it is where a hosted server diverges furthest from a local one.

How Do You Check a Host's Auth Against the MCP Spec?

Transport is settled; auth is the next field a grade rarely reports. The current spec's authorization page names six parts a host should match: authorization server discovery, client registration, scope selection, the resource parameter, canonical server URIs, and access token usage.

Run four yes or no checks against the host you are testing:

1. Does the server answer an unauthenticated call?

2. Does it advertise discovery metadata?

3. Does it ask for a scope you can read?

4. Does it bind the token to a canonical server URI?

Two outcomes are honest: no auth needed for the tools you use, or a documented flow that matches the spec. A host offering neither evidence nor documentation is the one to skip. Note the spec version you tested against, since conformance language changed between releases.

Moltline sits in the first outcome. The 110 free tools need no account, API key or signup, so nothing on the free tier exercises an OAuth flow. Grab a slug from the hosted server list, call it cold, and read the response. For a no-auth comparison across session types, there is a write-up on browser MCP.

Premium tools behave differently. Call one without a licence and you get premium_tool_requires_license with a pointer to the purchase path. That is a licensing check, not an OAuth failure, and not a 402.

Next field: what the free tier actually counts.

What Does the Free Tier Actually Include?

Auth settled, the next field is what you actually get without paying. Define the measurement before comparing: tools reachable with no account, no key, no card and no signup, counted against the total the host advertises. Everything else is positioning.

Four checks:

• Count usable tools from the host's own listing, not a summary page.

• Call three cold, with no credentials, and confirm each returns a tool result.

• Check whether the count is per server or site-wide. Twenty servers with five free tools each is a different offer from five free tools total.

• Check whether free tools rate-limit silently once called repeatedly.

That follows the FTC's rule that a "Free" offer carries its qualifier in the claim itself, not a footnote (16 CFR § 251.1). Free of signup and free of charge for a limited count are different offers that read identically on a landing page.

Moltline's figures: 22 hosted servers, 160 tools, 110 free forever with no account, API key or signup. A builder who needs a tool outside the free count is looking at All-Access at $19/month, paid in crypto for now.

Open one free Moltline server entry to see what the free count looks like per server, then repeat the four checks against Glama's own listing before you compare totals.

How Do You Pay a Host, and Can an Agent Pay It?

x402 is an HTTP challenge and response scheme that lets a client settle a payment inside the request cycle, documented at x402.org. At Moltline it buys a licence, not a call.

Run this check on any host, in order:

1. Currency: crypto or fiat?

2. Network: which chain settles the charge?

3. Human path: can a person pay with no card?

4. Agent path: can an agent pay with no human in the loop?

5. Billing shape: subscription, day pass, or per call?

Moltline answers crypto, for now. People pay through the NOWPayments checkout in ETH, USDT, SOL or any of 300+ coins. Agents pay over the live x402 challenge on /api in USDC on Base, settling the same licence without a human in the loop.

There is no card payment option yet. A builder whose finance process only pays by card cannot buy All-Access today.

Billing is never per call. One licence covers the premium tools for the period, and the x402 endpoint sells the same month or day pass an agent would buy. That makes wiring premium tool calls a licence check on the client side, not a payment loop.

Support is one person, not a team: first reply within 24 hours, confirmed defects fixed within 30 days.

With payment settled, the last field is what the host publishes for each server.

What Is on the Public Listing, and Can You Verify It?

Payment settled, the last field is the listing itself. A public listing shows what the host claims to serve, not whether the tool does its job inside your agent. Only a call from your client shows that.

Run this reading order on any host:

1. Open the host's listing page.

2. Open the specific server entry, not the summary.

3. Open any grade or audit the entry cites.

4. Repeat the endpoint and auth checks against that server.

Set the evidence bar before you read. A grade is worth citing only when it links to that server's own result page. A number with no link is not a verification step, so cut it rather than repeat it.

Apply that bar here. Grades for the 22 Moltline servers come from MCPize, and each should be read on that server's own public MCPize listing rather than taken from this page. Where a link is missing, treat the grade as absent.

Run the same reading order on Glama's pages. Its listings, endpoints, free tier, auth and payment are read from its own site, not from here.

Client wiring still matters after the listing passes. See connecting Claude without custom wiring for the transport side.

One related but separate tool: 21 checks on agent readability tests whether an agent can read a site, not whether an MCP host serves a working endpoint.

Moltline vs Glama: The Same Five Fields, Filled In

Read Glama's side from its own pages and set it beside this column on your own screen. The comparison is portable; the verdict is yours.

Limitations, stated plainly

• One person runs the studio.

• Crypto only for now. No card payment yet.

• No published uptime percentage or SLA.

• No per-call billing.

• No hosting of anyone else's tools.

Fit check

• Need to pay by card? Not possible yet.

• Need a documented SLA? Walk away.

• Need a free endpoint for three tools, plus an agent that can pay in USDC? This clears the first four fields.

Licences are per period, never per call, which matters when a licensing model meets an agent stack. Pick any server from the hosted catalogue and run the endpoint test against it before you commit.

Run the Five Fields and Reach Your Own Answer

The method is five fields, three checks you can run today, and one column only you can fill.

Run these three checks before you decide:

1. curl -i https://mcp.moltlinestudio.com/<server> for one server on each host. Read the status line and the content type.

2. Call one free tool with no credentials. A result without a key confirms the free tier is real.

3. Open one cited grade. If the link does not resolve to that server's own result page, treat the grade as absent.

The reusable four checks are endpoint format, free tier, auth, and payment. The fifth field, the public listing, is the one no article can fill for you. no-signup endpoint in Claude Code shows one client-side setup.

Three things would change the answer: a card payment requirement, a published SLA requirement, or a tool that exists on one side and not the other.

Conclusion

The five-field method keeps a host decision testable. Endpoint format, free tier, auth, and payment are checks you can run. The public listing is the field only you can fill. Moltline lists 22 servers, 160 tools, 110 free with no signup, and All-Access at $19/month in crypto. Glama remains a comparison point, not a verdict.

• Run this against one server per host:

curl -i https://mcp.moltlinestudio.com/<server>

• Call one free tool without credentials.

• Open one cited grade and confirm it resolves to that server's MCPize result page.

Next, pick a server from the hosted catalogue and run the endpoint test before you commit. Your own checks beat any ranking. That is how you choose a host you can defend.