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Directory / 402lounge

402lounge

Q: Is 402lounge MCP server safe?

QAmcp's test on 5 Nov 2026: None of the hidden-instruction wordings we know were found in its 55 tool descriptions. 0 of its 55 tools are labeled read-only; the others may change or send things. Overall it scored 77/100 on 5 Nov 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by 402lounge.com · https://mcp.402lounge.com/mcp

Receipts, invoices and a payTo register for AI agents that pay with x402 (USDC on Base).

55 tools✓ no account neededPricing: on their site

See pricing →Visit website

77 /100

PASS · WITH NOTES

Partial: 8 of 11 checks · 5 Nov 2026

Test it now for current results

At a glance

Runs where: On their server. What you send to it goes to them.
What you need: Nothing: it answered without a login
Tools: 55 tools
Its own safety labels: 0 read-only, 55 with no label
Memory it takes: About 14,500 tokens of your AI's memory, just for its tool descriptions

Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 5 Nov 2026.

Is 402lounge MCP server safe?

None of the hidden-instruction wordings we know were found in its 55 tool descriptions.
0 of its 55 tools are labeled read-only; the others may change or send things.
Overall it scored 77/100 on 5 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What this test does not check

Its source code and packages.
What a tool quietly does behind the scenes, such as writing a file or calling another service.
Instructions hidden inside live tool answers. We only look for those in tool descriptions.
Hidden instructions worded in a way our list doesn't know yet.
Tools that could change something. Those are read, never run.

What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection

Known security advisories

It lists no public code, so there is nothing to look up in GitHub Security Advisories or OSV.dev. QAmcp tests how a server behaves. It does not scan source code.

What it can do

55 tools, in the server's own words.

lounge.requirements

Rules, prices, the current terms and the exact sentences you will sign.

lounge.terms

Versions, hashes and links of the terms and the privacy notice.

lounge.signup

Free.

lounge.me

Who you are (agent and role), your company with its agents, people and level, its wallets, your apps, terms state and pending notices.

lounge.agent.update

Your name inside the company, 1 to 40 characters, unique in the company.

lounge.wallet.add

The new wallet proves itself: first call returns a challenge for it, second call with wallet_proof {message, signature} adds it.

lounge.wallet.remove

Your own wallets (admins: any wallet of the company).

lounge.wallet.primary

The wallet you sign in with.

lounge.wallet.list

All wallets of your company, each with the agent that operates it.

lounge.session

create: a new lg_ token (needs a signature or an existing token).

lounge.apps

Which clients this agent has used.

lounge.notices

Terms changes, moderation decisions, deletion and security notes, for you and for your company.

lounge.dashboard.link

A one-time browser link (10 minutes) into your company's dashboard, signed in as you, for the human behind you.

lounge.account.export

Everything 402lounge keeps about you as an agent off chain, as JSON.

lounge.account.delete

Schedules your deletion as an agent in 7 days.

receipts.record

Call this after every x402 payment: the transaction hash from the PAYMENT-RESPONSE header plus the URL you paid.

receipts.list

Receipts of your company for one month (default: the current month, Europe/Berlin), newest first, each with the agent that paid.

receipts.get

A single receipt of your company by id or transaction hash.

register.lookup

Wallet in, seller out: the listing that owns a payTo address, its verification level, its paid endpoints and the last health check.

company.get

Legal data, VAT status, tier and level, what is missing for the next tier, its agents with this month's spending, its people and your role.

company.update

Admins only.

company.vat_check

Asks VIES again and updates the tier.

company.email

Where documents and notices go.

company.invite

Admins only.

and 31 more

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Every tool is described
39 warnings
- !lounge.terms: Inputs with no description: accept
- !lounge.signup: Inputs with no description: accept
- !lounge.agent.update: Inputs with no description: name
- !lounge.wallet.add: Inputs with no description: address, provider, wallet_proof
- !lounge.wallet.remove: Inputs with no description: address
- !lounge.wallet.primary: Inputs with no description: address
- !lounge.wallet.list: Inputs with no description: mine
- !lounge.session: Inputs with no description: action, session_id
- and 31 more
note
!
Tools are labeled safe or dangerous
5 warnings
- !55 of 55 tools have no safety label (read-only or dangerous): lounge.requirements, lounge.terms, lounge.signup, lounge.me, lounge.agent.update, lounge.wallet.add, lounge.wallet.remove, lounge.wallet.primary, lounge.wallet.list, lounge.sessi
- !lounge.wallet.remove: Name sounds like it deletes something, but it is not labeled dangerous
- !lounge.account.delete: Name sounds like it deletes something, but it is not labeled dangerous
- !company.agent.remove: Name sounds like it deletes something, but it is not labeled dangerous
- !company.close: Its description says "and deletes", but it is not labeled dangerous. Worth double-checking the label, since AI apps trust it.
note
!
Follows MCP best practices (not scored yet)
3 tips (not scored)
- !55 tools not labeled read-only don't say whether running them twice is safe (idempotentHint): lounge.requirements, lounge.terms, lounge.signup, lounge.me, lounge.agent.update, lounge.wallet.add and 49 more
- !55 tools don't say whether they reach outside services like the web (openWorldHint): lounge.requirements, lounge.terms, lounge.signup, lounge.me, lounge.agent.update, lounge.wallet.add and 49 more
- !The tool list is about 62 KB (roughly 15k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
note
✓
ConnectsConnected in 1.1 s
pass
✓
Lists its toolsFound 55 tools
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Fast enough
All good
- ✓Connecting took 1.1 s
- ✓Listing tools took 64 ms
pass
–
Tools work with good inputs
Not tested
- –lounge.requirements: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.terms: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.signup: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.me: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.agent.update: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.wallet.add: Not run: no safety label (if you own this server, test again in owner mode)
- –lounge.wallet.remove: Not run: name sounds like it deletes something
- –lounge.wallet.primary: Not run: no safety label (if you own this server, test again in owner mode)
- and 32 more
not tested
–
Bad inputs give a clean errorNot tested
not tested
–
Tools work togetherNo safe tool returned data to start a chain from, so chains were not tested (not counted either way)
not tested
–
No secrets leakedNo error messages to check
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://mcp.402lounge.com/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-402lounge-mcp.svg)](https://qamcp.dev/s/com-402lounge-mcp.html)

Score over time

5 Nov 202677

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use 402lounge, signed in with GitHub, one per person. Reviews never change the score.

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