# Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL (remote · sdn-screen-x402.sdnscreen.workers.dev)

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

- Trust score: 68/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `sdn-screen-x402.sdnscreen.workers.dev`: 68/100 (this document), [markdown](https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402.md), [page](https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402)

## Channel facts

- Endpoint: `https://sdn-screen-x402.sdnscreen.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.3.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1293 tokens (~215/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server?

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL is a hosted endpoint at https://sdn-screen-x402.sdnscreen.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http dev-workers-sdnscreen-sdn-screen-x402-agent-pref 'https://sdn-screen-x402.sdnscreen.workers.dev/mcp'
```

### Cursor

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

### VS Code

```json
{
  "servers": {
    "dev-workers-sdnscreen-sdn-screen-x402-agent-pref": {
      "type": "http",
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}
```

### Codex

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

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-workers-sdnscreen-sdn-screen-x402-agent-pref": {
      "type": "remote",
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-workers-sdnscreen-sdn-screen-x402-agent-pref --url 'https://sdn-screen-x402.sdnscreen.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-workers-sdnscreen-sdn-screen-x402-agent-pref:
    url: "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-workers-sdnscreen-sdn-screen-x402-agent-pref": {
      "Transport": "http",
      "Url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-workers-sdnscreen-sdn-screen-x402-agent-pref -t streamable-http -u 'https://sdn-screen-x402.sdnscreen.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-workers-sdnscreen-sdn-screen-x402-agent-pref": {
      "type": "http",
      "url": "https://sdn-screen-x402.sdnscreen.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-18 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-13 (score 66, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 65)

First indexed and scored.

## MCP tools (6)

### `ofac_wallet_screen` (~177 tokens)

OFAC SDN 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"].

Input parameters:

- `address` (string, required): Wallet address. EVM 0x... (case-insensitive), BTC 1.../3.../bc1..., TRON T..., Solana base58, etc.

### `dns_lookup` (~229 tokens)

DNS Records 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"].

Input parameters:

- `name` (string, required): Domain or hostname, e.g. example.com. A full URL or email address is accepted and reduced to its host. Alias: domain.
- `type` (string): ALL (default: A, AAAA, CNAME, MX, NS, TXT, SOA, CAA) or one record type.

### `email_auth_check` (~239 tokens)

Email Auth Check (SPF/DMARC/DKIM)

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"].

Input parameters:

- `domain` (string, required): Email domain, e.g. example.com. A URL or email address is reduced to its domain.
- `selector` (string): Optional DKIM selector to check authoritatively (in addition to the common list: google, selector1, selector2, default, k1, k2, s1, s2, dkim, mail, mandrill, pm, zoho, protonmail, fm1).

### `whois_domain_age` (~180 tokens)

Domain Age & Registrar (RDAP)

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"].

Input parameters:

- `domain` (string, required): Domain, e.g. example.com. A URL, hostname or email address is reduced to its registrable domain. Alias: name.

### `email_mx_verify` (~162 tokens)

Email Address Verify (MX, no SMTP)

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"].

Input parameters:

- `email` (string, required): Email address to check, e.g. someone@example.com

### `url_unshorten` (~179 tokens)

URL Unshorten & Redirect Check

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"].

Input parameters:

- `url` (string, required): http(s) URL to expand. A bare host gets https:// added. Private/loopback hosts are refused.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402#diagnostics

## Score history

- 2026-10-18: 68
- 2026-10-17: 67
- 2026-10-16: 67
- 2026-10-15: 66
- 2026-10-14: 66
- 2026-10-13: 66
- 2026-10-12: 65

## Common questions

### What is the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server?

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL is an MCP server listed in the public MCP registry as dev.workers.sdnscreen.sdn-screen-x402/agent-preflight. $0.01/call via x402: OFAC wallet screen, DNS, email auth, domain age, email verify, URL unshorten. This page covers its hosted endpoint (https://sdn-screen-x402.sdnscreen.workers.dev/mcp).

### Is the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server safe to use?

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server expose?

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL exposes 6 tools: ofac_wallet_screen, dns_lookup, email_auth_check, whois_domain_age, email_mx_verify, url_unshorten. Their descriptions and schemas cost roughly 1,166 tokens of context every time the server is loaded.

### Does the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server require authentication?

No. We connected to Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL MCP server still maintained?

Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://sdn-screen-x402.sdnscreen.workers.dev/mcp
- Website: https://sdn-screen-x402.sdnscreen.workers.dev/llms.txt
- Changelog RSS feed: https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402.json
- HTML version of this page: https://verifymcp.io/servers/dev-workers-sdnscreen-sdn-screen-x402-agent-preflight/sdn-screen-x402