Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP Server

by workers-sdnscreen-sdn-screen-x402 Your server? Claim it

answering

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL is answering right now. Last checked 3 min ago. It exposes 6 tools.

$0.01/call via x402: OFAC wallet screen, DNS, email auth, domain age, email verify, URL unshorten.

Uptime history 6 days of history

6 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

219 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 12 October 2026. No other catalogue keeps this.

12 Oct 3 tools appeared email_mx_verify, url_unshorten, whois_domain_age

12 Oct a tool changed version

Nothing serious here today

Today is the operative word: we check Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add agent-preflight --transport http https://sdn-screen-x402.sdnscreen.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "agent-preflight": {
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.agent-preflight]
url = "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "agent-preflight": {
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "agent-preflight": {
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

email_auth_check

Checks a domain's email authentication: parses SPF (+all, ?all, multiple records, over 10 DNS lookups), DMARC (p, sp, pct, rua), DKIM keys (your selector or 15 common ones) and MX, then returns an A-F grade, 0-100 score and coded issues (spf_missing, dmarc_p_none, ...). Use when an agent must judge if a domain can be spoofed, debug deliverability, or vet a sender/vendor domain. $0.01 USDC on Base. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

email_mx_verify

Checks an email address without sending mail or opening SMTP: syntax, domain exists, MX records (or RFC 5321 A/AAAA fallback), RFC 7505 null MX, MX host resolves, disposable-domain list (~9.9k domains), role account (info@, support@) and free provider. Verdict deliverable_domain, risky, undeliverable or unknown. Cannot prove the mailbox itself exists. Use when an agent validates a signup, lead or contact email before using it. $0.01 USDC. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

dns

dns_lookup

Resolves live DNS records for any domain or hostname via 1.1.1.1: A, AAAA, CNAME, MX, NS, TXT, SOA and CAA in one call (type=ALL), or a single type incl. SRV, PTR, DS, DNSKEY, HTTPS. Clean JSON with TTLs, NXDOMAIN flag and DNSSEC-authenticated bit. A URL or email address is reduced to its host. Use when an agent needs to verify a domain, find mail servers or nameservers, or read TXT/SPF records. $0.01 USDC on Base. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

ofac

ofac_wallet_screen

Screens a crypto wallet address (EVM, BTC, TRON, SOL, XMR and every other chain OFAC lists) against all Digital Currency Addresses on the US Treasury OFAC SDN list. Returns sanctioned true/false, verdict block/no_match, SDN entity name, sdnType, programs and the list publish date. Use when an agent is about to send funds to, pay, or accept funds from an unfamiliar wallet. $0.01 USDC on Base. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

url

url_unshorten

Follows a URL's HTTP redirects hop by hop (max 10, page bodies never read) and returns the final URL, status, the full chain and heuristic safety flags: shortener_used, cross_domain_redirect, https_downgrade, ip_address_host, punycode_host, userinfo_in_url, high_abuse_tld, credential_keyword_after_redirect, loops. Risk low/medium/high. Use before an agent clicks, fetches or forwards an unfamiliar or shortened link. Not a malware-reputation lookup. $0.01 USDC. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

whois

whois_domain_age

Looks up a domain in its registry's RDAP server (the ICANN successor to WHOIS, found via the IANA bootstrap): registration date, age in days/years, newlyRegistered (<30 days), expiry, last change, registrar name + IANA ID, EPP status, nameservers and DNSSEC. No personal contact data. Use when an agent must judge if a domain, sender or vendor is brand-new (a phishing/fraud signal). Unsupported TLDs return 400, uncharged. $0.01 USDC. Paid tool: call it once to get the x402 PaymentRequired object, then retry with params._meta["x402/payment"].

Endpoints

URL	Transport	State	Latency	Checked
https://sdn-screen-x402.sdnscreen.workers.dev/mcp	streamable-http	answering	55 ms	3 min ago

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Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL — questions

Answers built from our own checks of this server.

What can Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL do?

It exposes 6 tools, read directly from the server on our last check. Among them: dns_lookup, email_auth_check, email_mx_verify, ofac_wallet_screen, url_unshorten, whois_domain_age. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 219 ms. The bar chart above shows every period we have measured.

How do I connect Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL need an API key?

No. Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL?

It answers our handshake in 219 ms on average, which is faster than 57% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.