QAmcp

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Directory / FactStamp

FactStamp

Q: Is FactStamp MCP server safe?

QAmcp's test on 28 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. 15 of its 18 tools are labeled read-only; the others may change or send things. Overall it scored 95/100 on 28 Oct 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 factstamp.dev · https://agents.factstamp.dev/mcp

Verify a company, figure or citation before you rely on it. Card or crypto; signed receipt.

18 tools✓ no account neededPricing: not listed

Visit website

95 /100

PASS · WITH NOTES

11 of 11 checks · 28 Oct 2026

Is FactStamp MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
15 of its 18 tools are labeled read-only; the others may change or send things.
Overall it scored 95/100 on 28 Oct 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 it can do

18 tools, in the server's own words.

list_seriesread-only

Included.

route_claimread-only

Included.

list_card_packagesread-only

Included.

buy_card_package

Included.

check_figureread-only

Submit the dated figure you are about to act on.

check_entityread-only

Verify a legal entity: does this company exist, under which identifier and jurisdiction, and is its registration current?

check_entity_fileread-only

The entity file: ONE paid answer holding everything we hold about one company: the whole picture in ONE call rather than four separate facts stitched together,…

check_entity_file_ilread-only

Israeli company lookup and company register check by company number (nine digits, with its own check digit) or by registered name, Hebrew or English: identity,…

check_entity_file_caread-only

Canadian company lookup and Canadian federal corporation register check by nine-digit Business Number (BN) only: corporation number, BN, governing legislation,…

check_sanctionsread-only

Sanctions screening of a name, for whether a person or company is on a sanctions list — and which one.

check_vatread-only

An EU VAT number check — VAT validity, and the VAT registration behind it.

verify_citationread-only

Says whether a citation can be repeated.

verify_packageread-only

Reports on a dependency at the point of installation.

watch_add

Watch ONE citation or ONE package version instead of checking it once.

watch_portfolio

Watch a whole list instead of one reference at a time: up to 25 citations or package versions re-checked every day for 30 days under one token.

verify_bulkread-only

Check a whole list in one call: a bibliography or a dependency manifest.

check_documentread-only

A whole document in one call: the claims that can be verified against a primary source, each answered by the door that owns it with its own signed receipt, plu…

audit_claimsread-only

Audit what an agent believes about companies.

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 (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Follows MCP best practices (not scored yet)
1 tip (not scored)
- !3 tools answer with structured data but don't declare its shape (outputSchema): list_series, route_claim, list_card_packages. If those answers change shape, nothing can catch it; with a schema, every answer is checked.
note
✓
ConnectsConnected in 2.3 s
pass
✓
Lists its toolsFound 18 tools
pass
✓
Every tool is describedAll 18 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓list_series: Worked (782 ms)
- ✓route_claim: Worked (125 ms)
- ✓list_card_packages: Worked (157 ms)
- ✓check_figure: Answered with an error, probably because of our sample input: {"x402Version":1,"error":"PAYMENT_REQUIRED","accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"50000","payTo":"0xc3bcd24a2b…
- ✓check_entity: Answered with an error, probably because of our sample input: {"x402Version":1,"error":"PAYMENT_REQUIRED","accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"100000","payTo":"0xc3bcd24a2…
- ✓check_entity_file: Answered with an error, probably because of our sample input: {"x402Version":1,"error":"PAYMENT_REQUIRED","accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"438119","payTo":"0xc3bcd24a2…
- ✓check_entity_file_il: Answered with an error, probably because of our sample input: {"x402Version":1,"error":"PAYMENT_REQUIRED","accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"300000","payTo":"0xc3bcd24a2…
- ✓check_entity_file_ca: Answered with an error, probably because of our sample input: {"x402Version":1,"error":"PAYMENT_REQUIRED","accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"250000","payTo":"0xc3bcd24a2…
- and 10 more
pass
✓
Bad inputs give a clean error
All good
- ✓route_claim: Refused missing required input "claim" with a clear error
- ✓route_claim: Refused wrong type for "claim" with a clear error
- ✓check_figure: Refused missing required input "claim" with a clear error
- ✓check_figure: Refused wrong type for "claim" with a clear error
- ✓check_entity: Refused missing required input "query" with a clear error
- ✓check_entity: Refused wrong type for "query" with a clear error
- ✓check_entity_file: Refused missing required input "query" with a clear error
- ✓check_entity_file: Refused wrong type for "query" with a clear error
- and 17 more
pass
✓
Fast enough
All good
- ✓Connecting took 2.3 s
- ✓Listing tools took 164 ms
- ✓Average tool answer: 160 ms
- ✓list_series: Slowest tool: list_series (782 ms)
pass
✓
No secrets leakedChecked 37 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://agents.factstamp.dev/mcp

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Score over time

28 Oct 202695

One test so far. New tests will show here.

Reviews

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

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