Sanctions and vendor checks in Claude

Add Pyxmark as a custom connector in claude.ai or Claude Desktop, or with one command in Claude Code, and Claude can screen a company or person against the OFAC, UN, EU and UK sanctions lists for you.

Server address (Streamable HTTP, no sign in or key):

https://mcp.pyxmark.com/mcp

Pyxmark is a hosted MCP server, so there’s nothing to install and no key to paste. Free use is 25 lookups a day per IP address, and every tool call counts as one.

claude.ai and Claude Desktop

Customize → Connectors → + Add → Add custom connector. Name it Pyxmark, paste the URL and click Continue. Review the authentication settings and click Continue, choose No sign in, then finish by clicking Add.

To use it in a chat, click the + button on the lower left, then Connectors, and switch Pyxmark on for that conversation.

Free plans allow one custom connector. On Team and Enterprise an owner adds it first under Organization settings → Connectors, and then each member connects it from Customize → Connectors.

Claude Desktop uses the same connector, because remote connectors are set up through your Claude account. Steps checked against Anthropic’s custom connector guide.

Claude Code

Run this in a terminal:

claude mcp add --transport http pyxmark https://mcp.pyxmark.com/mcp

By default the server is added for you in the current project only. To confirm it connected, run claude mcp list, or type /mcp inside Claude Code.

Scopes and other options are in the Claude Code MCP docs.

Ask it

First check the connection: ask “List the Pyxmark tools” and Claude should show the read-only tools listed in the tool reference. Then ask “Is Microsoft Corporation on any sanctions list?” It should come back with no match.

For a real vendor, try:

Run a due diligence report on Acme Corp, acme.com, Delaware.

Claude calls due_diligence_report and gets back one report:

A sanctions screen across the OFAC SDN and Consolidated, UN, EU and UK lists. Each potential match has a score, its list entry ID and a link to the official source.
The company’s SEC record and risk filings, if it files with the SEC.
The domain’s registration date, its MX, SPF and DMARC records, and its first Wayback Machine snapshot.
A link to the state business registry search.
A clear, review or hold verdict with the reasons.

You can see a full example on the OFAC sanctions MCP page. To have Claude run it before every supplier payment, paste this project instruction.

Limits

Results are informational, not a compliance determination or legal advice.
Names are matched fuzzily, so some potential matches will be other people or companies with similar names. Check each one against the linked official entry before you act.
SAM.gov federal exclusions aren’t synced yet, so each report links to a SAM.gov search instead.
Pyxmark isn’t for consumer screening (credit, jobs, housing, insurance or tenancy).

How matching, verdicts and list refreshes work: sources, method and limits.

Using another assistant? Steps for ChatGPT, Cursor, Grok and more are on connect Pyxmark to your AI agent.