FactStamp bronze

agents.factstamp.dev

“Paid verification for agents: cited, dated answers about a company, a figure or a citation, each with an Ed25519 receipt that verifies offline.

a2a https://agents.factstamp.dev/mcp talk to it https://agents.factstamp.dev/.well-known/agent-card.json its card

Checked 10h ago pushNotifications, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Google Trust Services domain-validated
Valid until 8 Jan 2027 as of our check on 15 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.

Key ECDSA P-256, signed ECDSA-SHA256, issued via WE1 under GTS Root R4 — classical, as every publicly trusted certificate is today.

Names on this certificate (3)

factstamp.dev, agents.factstamp.dev, *.agents.factstamp.dev.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 15 Nov 2026. What this means
DANE / TLSA: Not verified (TLSA query returned RCodeNameError)
Discovery: Well-known document
This host also publishes an ARD catalog (/.well-known/ai-catalog.json) declaring 3 resources. The catalog's entries are the publisher's claims, not something agenttru.st verified.
AI use policy: Search: yesAI input: yesAI training: no

What this site's robots.txt says about how AI may use its content. Recorded as the operator wrote it, not enforced — these are preferences about use, not access, and agenttru.st only reads the agent's own discovery documents.
AI-facing documents: Publishes /llms.txt — “FactStamp” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 10 Oct 2026

View verification details

Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 10h ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of agents.factstamp.dev controls every word below.

check_entity

FactStamp company verification: whether a legal entity exists, is registered, and under which identifier. Reads GLEIF, US SEC EDGAR, the Australian Business Register (ABN, ACN, GST, status) and an ASIC search by ACN or ABN. Relevant wherever a company is named in a contract or filing: an Australian company check, a company register check, an ABN lookup, or an ABN, ACN, LEI or CIK for a company known only by name. Returns found, ambiguous, not_found or unknown, cited with its retrieval time.

check_entity_file

FactStamp company verification, company lookup and company register check across the company registers, for one company in full at the point of signing, onboarding or due diligence: an Australian company check and ABN lookup by company number or name (ACN, ABN, LEI or CIK). Identity, standing, registered office, SIC, filings, a six-list sanctions screen, and ownership where the registers publish it. Reads GLEIF, Companies House, the ABR, ASIC and Corporations Canada. Not a KYB provider.

check_figure

FactStamp fact check: a dated figure or statistic checked against the publisher's own series (Australian primary sources, e.g. the Reserve Bank of Australia), returning verified, stale, contradicted or unknown with the as-of date. Relevant wherever a number is going onto a page, deck, model or decision. Anything outside coverage returns unknown rather than a guess.

verify_citation

FactStamp citation check: says whether a citation can be repeated. Give a DOI, an arXiv ID or a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted, read from Crossref and arXiv. A title absent from both returns not_found, and a near title match is never reported as verified. Cited to the source record with its retrieval time. Verdicts: verified, ambiguous, retracted, not_found, unknown.

verify_package

FactStamp package check: reports on a dependency at the point of installation. Give a package and, optionally, a version with its ecosystem (npm, PyPI, crates.io); the answer says whether that exact version exists, whether it is yanked or deprecated, and every advisory OSV lists against it. A version never published returns not_found with the real versions nearest to it. Verdicts: verified, advisory, yanked, not_found, unknown.

audit_claims

For an agent that needs its own beliefs checked: POST /audit with claims and it answers claim by claim as supported, contradicted, stale or not_checkable, each with the register's own value, its own date and a citation, plus one receipt over the batch. Refutation, not retrieval: nothing is inferred and not_checkable is never agreement. field is a name from the published vocabulary. US$0.20 a claim with a US$0.20 floor, counted from the body before payment.

check_document

FactStamp document check: for a document that quotes figures, names companies or cites papers, post the text and every checkable claim comes back verified against dated primary sources (the publisher's series, the company registers, Crossref, arXiv), as one signed bundle with a per-claim receipt and licence. Claims we cannot answer are named, never charged; the preview comes with the call. Verdicts: verified, stale, contradicted, unknown. Prose, not a list: a bare bibliography belongs to /bulk.

watch_add

FactStamp watch: a standing re-check of ONE citation or package version, for an answer that must stay true rather than true once: daily re-checks for 30 days against Crossref, arXiv, npm, PyPI, crates.io and OSV. US$0.50 the month, 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change gets its own signed receipt. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).

watch_portfolio

Watch a whole list at once, when a bibliography or a dependency manifest has to stay true: up to 25 citations or package versions re-checked every day for 30 days under one token. US$5 a portfolio — 20 cents a reference, under a cent a check. Every reference is answered and signed on purchase, and each real change gets its own signed receipt. Nothing is sent when nothing changed. A single subject on its own is /watch. Pay per call here, or redeem a prepaid pack code (100 credits).

verify_bulk

FactStamp bulk check: for a whole bibliography or dependency manifest in one round trip, read from Crossref, arXiv, npm, PyPI, crates.io and OSV: up to 12 items at a flat US$0.12, 1 cent an item against 2 cents for the same lookups one at a time. Every item is answered by the same door as a single call, so the verdicts cannot disagree. A list, not prose: a whole document belongs to /document. Pay per call here, or redeem a pack code (one answer-pack credit per three items, up to 25 items).

check_sanctions

FactStamp sanctions screening: a name checked against OFAC SDN and Non-SDN, the UN consolidated list, the EU Financial Sanctions File, the UK Sanctions List and Australia's DFAT list. Relevant before transacting with a party, and wherever a sanctions check must be evidenced. Returns listed, mismatch, not_found or unknown, with the matched entry's reference and list dates. A near name is never the same party; a list not consulted is named as not consulted. Not advice, not a legal determination.

check_vat

FactStamp VAT check: EU VAT validity and the VAT registration behind a VAT number, read from the official VIES service (European Commission), keyless. Relevant wherever a VAT number is relied on or cited. Returns valid, invalid or unknown (an outage is never reported as invalid) with the member state, the register's own request date, and the trader identity only where that member state discloses it. GB is out of scope after Brexit; XI (Northern Ireland) is covered. Not tax advice.

agent_card

An agent card for one business or agent: a signed JSON card naming what it is, its endpoint, its capabilities and its contact, with a provenance block stating nothing was checked against a register and naming every register not consulted. Use it when a directory or buying agent has no card to read. Published at a stable URL, signed with the receipt key. One card, US$0.50. Not a credential.

check_entity_file_il

FactStamp Israeli company file: a company lookup and register check by company number (nine digits, with its check digit) or registered name, when signing, onboarding or paying a counterparty, read live from the Registrar of Companies on data.gov.il. Seven sections: identity, type, status, purpose, incorporation date, government-company flag, last annual-report year, registered address. No officers or shareholders as people; no financials. Returns found, ambiguous, not_found or unknown.

check_entity_file_ca

FactStamp Canadian company file: a company lookup and federal corporation register check by nine-digit Business Number (BN), when signing, onboarding or paying a counterparty, read live from Corporations Canada. Six sections: corporation number, BN, governing legislation, every registered name, status, registered address, the minimum and maximum NUMBER of directors rather than their names, and annual returns. Keyed by BN, so a name alone cannot reach it. Returns found, not_found or unknown.

list_series

List what this engine covers

route_claim

Route a claim to a series (no verdict)

agenttru.st compared this card's skill list with every other listing's: 1 other listing declares an identical one, ignoring case, spacing and each card's own hostname. See all 2. That says the cards' text is the same, not who runs them.

What its catalog declares

From the ARD catalog this host publishes at /.well-known/ai-catalog.json. The operator controls every entry; agenttru.st verified that the catalog exists and parses, and nothing about what the entries say.

FactStamp

mcp-server-card

Paid verification for agents: cited, dated answers about a company, a figure or a citation, each with an Ed25519-signed receipt that verifies offline. Streamable HTTP, paid per call over x402 or from a prepaid pack. Two tools are included.

https://agents.factstamp.dev/.well-known/mcp/server-card.json

FactStamp HTTP API

vnd.oai.openapi

The same doors as the MCP tools, as plain HTTP: POST /check, /entity, /citation, /package and the rest, with the unpaid surfaces (/health, /series.json, /samples) marked as needing no payment in the document itself.

https://agents.factstamp.dev/openapi.json

FactStamp discovery card

agent-card

The agent card served at the A2A well-known path: what this service is, what it answers and what it charges. A generic agent card, not an A2A Agent Card — this host speaks MCP over HTTP and implements NO A2A JSON-RPC endpoint, which the card itself states in machine-readable form (transports.a2a and a2a_endpoint are null).

https://agents.factstamp.dev/.well-known/agent-card.json

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: Alpine AI — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.4
Auth schemes: pack_code x402
Card completeness: a2a.proto v1.0 requires eight top-level fields. This card omits:
supportedInterfaces

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

View all card details

Capabilities: pushNotifications streaming
Agent card: https://agents.factstamp.dev/.well-known/agent-card.json

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