Paid MCP Server Template
A production-ready template for building monetized MCP servers that require per-call payments via the Mainlayer infrastructure. It provides a structured payment gate that ensures AI agents pay for tool usage before accessing server logic or data.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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mainlayer
Source: Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
axios Vulnerable to Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`
axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge
Axios: Header Injection via Prototype Pollution
Allocation of Resources Without Limits or Throttling in Axios
Axios: Regular Expression Denial of Service (ReDoS) via Cookie Name Injection
MAINLAYER_API_KEYRESOURCE_ID_ANALYZE_CODERESOURCE_ID_GENERATE_IMAGE_PROMPTRESOURCE_ID_SEARCH_WEBRESOURCE_ID_SUMMARIZE_URLRESOURCE_ID_WEATHERTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
10/10 tools missing one or more hints — analyze_code (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); hello (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_time (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +7 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Secrets stay with their owner
2 secrets sent to a request target we could not resolve (MAINLAYER_API_KEY → dynamic, MAINLAYER_API_KEY → dynamic) — often a configured endpoint, not necessarily third-party
Audit where credentials are sent. A NOTION_TOKEN should only reach api.notion.com — never a third-party host.
Production dependencies are patched
0 critical, 10 high severity in production deps — axios@1.14.0 (high), axios@1.14.0 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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