Northline WebKit
Pay-per-call web tools for agents: URL to markdown, metadata, links, DNS, email/domain checks, RDAP.
Should I use this
Quality & Safety
Findings (1)
- LOWTool 'webkit_catalog' suggests web access but openWorldHint=falsein webkit_catalog
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"webkit": {
"url": "https://northline-webkit.northline-c86.workers.dev/mcp"
}
}
}Remote endpoints
https://northline-webkit.northline-c86.workers.dev/mcpstreamable-httpWhat it can do
Tool inventory
Tools (10)
🟢webkit_catalog
Free. Lists every WebKit tool with its price, required inputs and an example, plus how x402 payment works. Call this first.
Input Schema
{
"type": "object",
"properties": {}
}🟢url_to_markdown(url, maxChars)
Fetch any public web page and return clean, readable Markdown (main content only: no scripts, nav or footer) plus title, word count and final URL. Ideal for feeding pages to an LLM. Costs $0.003 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL (scheme optional)",
"minLength": 3
},
"maxChars": {
"type": "string",
"description": "Max markdown characters (1000-50000, default 20000)"
}
},
"required": [
"url"
]
}🟢url_metadata(url)
Link preview and SEO metadata for any URL: title, description, canonical, language, Open Graph and Twitter card, favicon, RSS/Atom feeds and JSON-LD types, after following redirects. Costs $0.002 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL (scheme optional)",
"minLength": 3
}
},
"required": [
"url"
]
}🟢url_links(url, external)
Every unique outgoing link on a web page (absolute URLs, anchor text, internal vs external), up to 500. Use it to crawl a site or find related pages. Costs $0.002 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL (scheme optional)",
"minLength": 3
},
"external": {
"type": "string",
"enum": [
"only",
"exclude"
],
"description": "Filter to only or exclude external links"
}
},
"required": [
"url"
]
}🟢url_check(url)
Is this URL up? HTTP status, full redirect chain, final URL, response time, content type, server/CDN and a security-headers grade (HSTS, CSP, X-Frame-Options...). Costs $0.001 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL (scheme optional)",
"minLength": 3
}
},
"required": [
"url"
]
}🟢dns_lookup(domain, type)
DNS records for a domain over DNS-over-HTTPS: A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV, PTR or HTTPS, with TTLs and DNSSEC validation flag. Costs $0.001 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain name, e.g. example.com",
"minLength": 3
},
"type": {
"type": "string",
"enum": [
"A",
"AAAA",
"CNAME",
"MX",
"TXT",
"NS",
"SOA",
"CAA",
"SRV",
"PTR",
"HTTPS"
],
"default": "A"
}
},
"required": [
"domain"
]
}🟢email_domain_check(email)
Check an email address or domain before you send: syntax, MX servers, accepts mail?, disposable or free provider, mail provider (Google, Microsoft...), SPF and DMARC policy, with risk flags. Costs $0.002 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"email": {
"type": "string",
"description": "Email address or bare domain"
}
},
"required": [
"email"
]
}🟢domain_whois(domain)
WHOIS for a domain via official RDAP: registered?, registrar, creation/expiry dates, domain age in days, status codes, nameservers, DNSSEC and abuse contact. Spot newly registered (phishing) domains. Costs $0.002 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain name, e.g. example.com",
"minLength": 3
}
},
"required": [
"domain"
]
}🟢robots_check(url, userAgent)
May I crawl this URL? Parses robots.txt and answers allowed true/false for your user agent and path, the matching rule, sitemaps, and whether 14 AI crawlers (GPTBot, ClaudeBot, PerplexityBot...) are allowed. Costs $0.001 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL (scheme optional)",
"minLength": 3
},
"userAgent": {
"type": "string",
"default": "*"
}
},
"required": [
"url"
]
}🟢domain_report(domain)
One-call domain due diligence: RDAP registration (age, registrar, expiry), DNS (A/AAAA/NS/CAA, DNSSEC), email setup (MX/SPF/DMARC), HTTPS reachability with security-headers grade, and risk flags such as newly_registered_lt_30d. Costs $0.005 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain name, e.g. example.com",
"minLength": 3
}
},
"required": [
"domain"
]
}Community
Evidence