Web & domain tools

si.fourzerotwoPublished by fourzerotwo.siOfficial publisherv1.0.1Updated Oct 24, 2026

Read any public page as markdown, link previews, URL safety, page audits, domain availability and…

The publisher's own server: fourzerotwo

VerifiedStreamable HTTPWeb executableWeb Search & Scraping Developer Tools Security & Monitoring

Server details

Identifier: si.fourzerotwo/web
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Oct 11, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to fourzerotwo.si, which also runs its endpoint. That identifies the publisher; it does not make the server's tools safe.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

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Overview

AI-generated overview

A remote MCP server for web and domain lookups: page reading, link previews, URL safety, SEO audits, domain/DNS/IP data and format validators.

What you can do: Read public web pages as clean markdown and pull link previews, feeds and sitemaps from a URL. Check a URL for redirects, TLS, domain age and lookalike tricks, and audit pages for SEO issues, robots rules and links. Look up domain availability, registration facts, DNS records, email authentication and abuse contacts. Resolve IP geolocation, ASN and network ownership, singly or in batches. Validate IMEI, VIN, IBAN, UK phone and postcode, and email addresses.
When to use it: Useful when an assistant needs live web and domain intelligence in one place: researching a site, checking whether a link is safe, auditing SEO, investigating a domain or IP, or validating identifiers and contact details.
Requirements: Remote streamable HTTP endpoint; no local install. An optional free X-API-Key header raises the daily free allowance from 100 to 500 calls. Beyond the free allowance, calls are paid per use in USDC via x402.

Before you install

Calls beyond the free allowance cost USDC per request, so usage can spend money. The X-API-Key header is a credential and should be kept private. Lookups send the queried URLs, domains, IPs and identifiers to a third-party service. Tools are read-only lookups but may reveal information about targets you query.

Installation

In SourceWeft

Open Web & domain tools in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/si.fourzerotwo%2Fweb/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "web-domain-tools": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/web"
    }
  }
}

Tools

domains__availability

Domains & DNS: Domain availability

Registered or available, straight from the TLD registry. A few free samples a day, then $0.002 USDC per call via x402.

Parametersdomainrequired

domains__facts

Domains & DNS: Domain registration facts

Registrar, created, expiry, age, status codes, nameservers and DNSSEC. A few free samples a day, then $0.002 USDC per call via x402.

Parametersdomainrequired

domains__dns

Domains & DNS: DNS records

A, AAAA, MX, NS, TXT, CNAME and CAA records (or one type). A few free samples a day, then $0.001 USDC per call via x402.

Parameterstypedomainrequired

domains__ip-owner

Domains & DNS: IP owner

Network, organisation, range, country and abuse email for an IP, from the regional internet registry. A few free samples a day, then $0.002 USDC per call via x402.

Parametersiprequired

domains__dmca-agent

Domains & DNS: DMCA agent

Published DMCA / abuse contact (email or form) for a major platform, host, CDN or registrar. A few free samples a day, then $0.002 USDC per call via x402.

Parametersdomainrequired

domains__abuse-contacts

Domains & DNS: Where to report a site

Everyone to send an abuse or takedown report to for a site: platform agent, hosting network (+ abuse email, CDN flag) and registrar. A few free samples a day, then $0.005 USDC per call via x402.

Parametersdomainrequired

domains__email-auth

Domains & DNS: Email authentication check

MX, SPF and DMARC for a domain, the mail provider, issues found and a grade. A few free samples a day, then $0.003 USDC per call via x402.

Parametersdomainrequired

domains__ideas

Domains & DNS: Domain name ideas

Rule-based domain candidates for a keyword: exact, stopword-free, hyphenated, prefixed and suffixed, across chosen TLDs, with a trademark flag. Free within the daily allowance, then $0.002 USDC per call via x402.

Parameterstldskeywordrequiredprefixessuffixestrademarks

ip-geolocation__lookup

IP Geolocation & ASN: IP lookup

Country, continent, EU membership, network block, ASN, organisation and hosting flag for one IP. Free within the daily allowance, then $0.001 USDC per call via x402.

Parametersiprequired

ip-geolocation__country

IP Geolocation & ASN: IP to country

Country and continent for one IP. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersiprequired

ip-geolocation__asn

IP Geolocation & ASN: IP to network owner

ASN, organisation and hosting flag for one IP. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersiprequired

ip-geolocation__batch

IP Geolocation & ASN: Batch lookup

Full lookup for up to 100 IPs in one call. A few free samples a day, then $0.02 USDC per call via x402.

Parametersipsrequired

seo__robots-check

SEO Tools: robots.txt check

Whether a crawler (Googlebot, GPTBot, ClaudeBot…) may fetch a URL, the rule that decided it, and declared sitemaps. A few free samples a day, then $0.002 USDC per call via x402.

Parametersurlrequireduser_agent

seo__page-audit

SEO Tools: On-page SEO audit

Title, meta, H1, canonical, noindex, hreflang, structured data, OG tags, word count, links, alt text, issues and a score. A few free samples a day, then $0.005 USDC per call via x402.

Parametersurlrequired

seo__links

SEO Tools: Extract links

Internal and external links on a page with anchor text and nofollow flags. A few free samples a day, then $0.003 USDC per call via x402.

Parametersurlrequired

seo__keyword-intent

SEO Tools: Keyword intent

Classify a search keyword as transactional, commercial, navigational or informational. A few free samples a day, then $0.0005 USDC per call via x402.

Parameterskeywordrequired

validators__imei

Validators: IMEI check digit

Validate an IMEI (length + Luhn) and split TAC, serial and check digit. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersimeirequired

validators__vin

Validators: VIN check

VIN format, check digit, WMI and model-year candidates. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersvinrequired

validators__iban

Validators: IBAN check

IBAN mod-97 checksum and country length; UK sort code extracted. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersibanrequired

validators__uk-phone

Validators: UK phone number

Classify a UK number (mobile, landline, freephone, premium…) and format as E.164. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parametersnumberrequired

validators__uk-postcode

Validators: UK postcode format

Validate and normalise UK postcode format; split outward/inward codes. Free within the daily allowance, then $0.0005 USDC per call via x402.

Parameterspostcoderequired

validators__email

Validators: Email check

Email syntax, whether the domain accepts mail, disposable and role-account flags. Free within the daily allowance, then $0.001 USDC per call via x402.

Parametersemailrequired

web__read

Web Reader: Read a page as markdown

Main content of a public web page as clean markdown, with title, byline, published date, canonical URL, language, word count and links. A few free samples a day, then $0.003 USDC per call via x402.

Parametersurlrequired

web__unfurl

Web Reader: Link preview (unfurl)

Open Graph and Twitter card data, favicon, theme colour, JSON-LD types, RSS/Atom feeds and sitemaps for a URL. Free within the daily allowance, then $0.002 USDC per call via x402.

Parametersurlrequired

web__url-safety

Web Reader: URL safety check

Warning signs for a URL: redirect chain and final destination, TLS certificate, domain age, punycode and brand-lookalike tricks, bare IPs, and security-header grade. Free within the daily allowance, then $0.003 USDC per call via x402.

Parametersurlrequired

Version history

v1.0.1LatestOct 11, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 daysRequired25 pts
Auth declaredRequired10 pts
Tools listedRequired15 pts
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.
LicenseNot applicable
A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.