paypay-mcp (mrslbt/paypay-mcp) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.

Back to MCP Trust Indexm8ven
C
Emerging
74/100
9 days ago

paypay-mcp

MCP server for the PayPay Open Payment API. Create QR codes, check payments, refunds, and cancellations. Tools documented in English and Japanese.

→ mrslbt/paypay-mcp· listed on github_topic

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

⚡ Live Monitored: not connected

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Who stands behind it

mrslbt

Source: github_topic · also listed on Glama

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// key findings
🚨
Known vulnerabilities in dependencies: 1 critical
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
🔐
You'll be asked for 1 credential: MCP_AUTH_TOKEN
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// known CVEs in dependencies1 critical

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

criticalvitest@2.1.9GHSA-5xrq-8626-4rwp

When Vitest UI server is listening, arbitrary file can be read and executed

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
🔐 secretMCP_AUTH_TOKENMCP_HTTP_HOST no Bind address. Default 127.0.0.1. Public binds require .
configMCP_HTTP_ALLOWED_ORIGINSno Comma-separated CORS allowlist. Default: none.
configMCP_HTTP_HOSTno Bind address. Default 127.0.0.1. Public binds require MCP_AUTH_TOKEN.
configMCP_HTTP_PORTno Port when MCP_TRANSPORT=http. Default 3000.
configMCP_TRANSPORTno stdio (default) or http
configPAYPAY_ENABLE_CANCELScancel_payment Cancel a payment when its state is unclear (timeout or error). Disabled unless =true.
configPAYPAY_ENABLE_REFUNDSrefund_payment Full or partial refund. Disabled unless =true.
configPAYPAY_ENVno sandbox (default) or production
// quality suggestions

Tool 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

6/6 tools missing one or more hints — cancel_payment (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create_qr_code (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); delete_qr_code (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +3 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.

Dev dependencies

1 critical/high in dev-only deps (does not ship to users)

Upgrade dev dependencies when convenient.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/mrslbt-paypay-mcp-1kz6ln)](https://m8ven.ai/mcp/mrslbt-paypay-mcp-1kz6ln)
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commit: 36eea75e72ec18232ec60de335641e0f2bb0f7fa
code hash: 2730086d733d8527b4e5c84edde5c25fc6fe471a5184faafaf7030d870c744d4
verified: 8/19/2026, 11:18:58 AM
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