The FactStamp MCP server,
connected in one click.
Paid verification for agents: cited, dated answers with a signed receipt that verifies offline. Connect the official FactStamp MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add FactStamp to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http factstamp https://factstamp.agentrails.workers.dev/mcpRun in your terminal, then restart Claude Code.
FactStamp · https://factstamp.agentrails.workers.dev/mcp
What your AI can do with FactStamp
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “list_series”: Free. What this engine covers, the publisher and as-of date behind each series, and the no-guess rule.”
“Use “route_claim”: Free. Shows which series a claim would be routed to, the value and date extracted, and the signals behind the score. Returns NO verdict — pa.”
“Use “check_figure”: Submit the dated figure you are about to act on. Returns verified, stale, contradicted or unknown, cited to the publisher's own series with.”
“Use “check_entity”: Verify a legal entity: does this company exist, under which identifier and jurisdiction, and is its registration current? Cited to open prim.”
How secure is the FactStamp MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how FactStamp holds up.
Security grade A
gate scanned 10 tools on Oct 1, 2026 for prompt injection and risky tool definitions — nothing to flag.
- lowwatch_add: User-supplied webhook could exfiltrate verification data
- lowwatch_portfolio: User-supplied webhook could exfiltrate bulk verification data
Official endpoint
Operated by FactStamp (workers.dev) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If FactStamp adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick FactStamp
Choose FactStamp in the gate directory. No sign-in needed.
Use it anywhere
FactStamp's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools FactStamp exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
list_series — Free. What this engine covers, the publisher and as-of date behind each series, and the no-guess rule.
route_claim — Free. Shows which series a claim would be routed to, the value and date extracted, and the signals behind the score. Returns NO verdict — pa
check_figure — Submit the dated figure you are about to act on. Returns verified, stale, contradicted or unknown, cited to the publisher's own series with
check_entity — Verify a legal entity: does this company exist, under which identifier and jurisdiction, and is its registration current? Cited to open prim
verify_citation — Check a citation before you repeat it. Submit a DOI, an arXiv ID or a paper title: returns whether it exists, what it is (title, authors, ye
verify_package — Check a dependency before you install it. Submit a package and version plus its ecosystem: returns whether that exact version exists, whethe
watch_add — Watch a citation or a package version instead of checking it once. Send kind ('citation' or 'package') and the subject (a DOI, an arXiv ID o
verify_bulk — Check a whole list in one call: a bibliography or a dependency manifest. Send items[] of {tool, input} or the citations[]/packages[] shortha
+ 2 more tools once connected
Who runs the FactStamp MCP server?
The FactStamp MCP server at a glance
https://factstamp.agentrails.workers.dev/mcpQuestions, answered
Is there an official FactStamp MCP server?
Yes — FactStamp operates its own remote MCP server at factstamp.agentrails.workers.dev. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect FactStamp to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick FactStamp in the directory. No account or sign-in is needed. From then on, FactStamp's tools are available in every client you've connected to gate.
Do I need to host anything?
No. FactStamp runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the FactStamp MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect FactStamp in minutes. No credit card required.
Connect more than just FactStamp
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up FactStamp in: Claude · Claude Code · ChatGPT · Cursor · VS Code