LayerCall

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com.layercall/trust-apiv1.0.0 Domain verified

Score an IP, email, phone, domain or device for fraud in one call, with the signals behind it.

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Call this server's tools from your browser. Nothing to install.

https://www.layercall.com/api/mcp

Authorization (required)

Bearer <your LayerCall API key>. Free key at https://www.layercall.com/get-key — 1,000 lookups a month, no card.

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

lookup_phone

Validate a phone number worldwide against its national numbering plan. Returns E.164, country, line type (mobile/fixed/VoIP/toll-free/premium) and a risk score. Works globally, not US-only.

phonestring, required

Number in international form (+14155552671) or national form with country set

countrystring

ISO 3166-1 alpha-2, required only for national-format numbers

strictnessinteger

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

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Tools (7)

lookup_phone

Validate a phone number worldwide against its national numbering plan. Returns E.164, country, line type (mobile/fixed/VoIP/toll-free/premium) and a risk score. Works globally, not US-only.

Argument	Type	Description
phone*	string	Number in international form (+14155552671) or national form with country set
country	string	ISO 3166-1 alpha-2, required only for national-format numbers
strictness	integer

Input schema (JSON)

{
  "type": "object",
  "required": [
    "phone"
  ],
  "properties": {
    "phone": {
      "type": "string",
      "description": "Number in international form (+14155552671) or national form with country set"
    },
    "country": {
      "type": "string",
      "description": "ISO 3166-1 alpha-2, required only for national-format numbers"
    },
    "strictness": {
      "type": "integer",
      "maximum": 3,
      "minimum": 0
    }
  }
}

score_device

Judge a browser fingerprint from /fp.js: headless detection, automation frameworks (Selenium, Puppeteer, Playwright), timezone-versus-IP mismatch and repeat-device history. Note the ceiling honestly — the declared signals it relies on are the first thing stealth tooling patches, so a clean result is weaker evidence than a dirty one.

Argument	Type	Description
ip	string	Visitor IP, so timezone-vs-country can be checked
device_id*	string	Hex fingerprint from /fp.js

Input schema (JSON)

{
  "type": "object",
  "required": [
    "device_id"
  ],
  "properties": {
    "ip": {
      "type": "string",
      "description": "Visitor IP, so timezone-vs-country can be checked"
    },
    "device_id": {
      "type": "string",
      "description": "Hex fingerprint from /fp.js"
    }
  }
}

score_domain

Profile a domain: registration date from RDAP, registrar, MX/SPF/DMARC configuration, disposable-mail and risky-TLD detection. newly_registered is null when the age genuinely could not be determined — treat that as unknown, not as 'established'.

Argument	Type	Description
domain*	string	Bare domain, e.g. example.com

Input schema (JSON)

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Bare domain, e.g. example.com"
    }
  }
}

score_ip

Risk-score an IPv4 or IPv6 address. Detects commercial VPNs (naming the provider where its own published list confirms it), proxies, Tor exit nodes and datacenter hosting, and returns geolocation, ASN and a 0-100 risk score with an allow/review/block verdict.

Argument	Type	Description
ip*	string	IPv4 or IPv6 address, e.g. 8.8.8.8
strictness	integer	0 lenient, 1 balanced (default), 2 strict, 3 paranoid. Moves the verdict thresholds only; the score is unchanged.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "ip"
  ],
  "properties": {
    "ip": {
      "type": "string",
      "description": "IPv4 or IPv6 address, e.g. 8.8.8.8"
    },
    "strictness": {
      "type": "integer",
      "maximum": 3,
      "minimum": 0,
      "description": "0 lenient, 1 balanced (default), 2 strict, 3 paranoid. Moves the verdict thresholds only; the score is unchanged."
    }
  }
}

score_user

Score an entire signup in one call — any combination of IP, email, phone and domain — returning a single weighted risk score, a verdict, and the top contributing signals. A hard block on any component is never averaged away. This is the tool to use when judging a person rather than a value. Costs one lookup PER COMPONENT supplied, not one per call, so four identifiers cost four; the response reports the exact figure as billable_lookups, and cached components are refunded.

Argument	Type	Description
ip	string
email	string
phone	string
strictness	integer
phone_country	string	ISO 3166-1 alpha-2 for national-format numbers

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "ip": {
      "type": "string"
    },
    "email": {
      "type": "string"
    },
    "phone": {
      "type": "string"
    },
    "strictness": {
      "type": "integer",
      "maximum": 3,
      "minimum": 0
    },
    "phone_country": {
      "type": "string",
      "description": "ISO 3166-1 alpha-2 for national-format numbers"
    }
  }
}

verify_agent

Cryptographically verify a Web Bot Auth signature (RFC 9421) — proof of WHICH agent is calling, not a guess from the user-agent. Returns verified true/false plus the agent's identity and declared purpose. This is the only check here that proves rather than infers, so it carries no score and no verdict: a verified assistant acting for a real user is usually welcome, a verified scraper usually is not, and that policy is the caller's. Pass the request the agent made to YOU — the signature covers its method, authority and path.

Argument	Type	Description
url*	string	Absolute URL the agent requested from you
method	string	HTTP method, default GET
headers*	object	Request headers, including signature, signature-input and signature-agent

Input schema (JSON)

{
  "type": "object",
  "required": [
    "url",
    "headers"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "Absolute URL the agent requested from you"
    },
    "method": {
      "type": "string",
      "description": "HTTP method, default GET"
    },
    "headers": {
      "type": "object",
      "description": "Request headers, including signature, signature-input and signature-agent"
    }
  }
}

verify_email

Check an email for syntax, MX records, disposable/throwaway providers, role accounts (info@, admin@), homograph lookalikes and domain age. Returns a 0-100 risk score and an allow/review/block verdict.

Argument	Type	Description
email*	string	Full email address
strictness	integer

Input schema (JSON)

{
  "type": "object",
  "required": [
    "email"
  ],
  "properties": {
    "email": {
      "type": "string",
      "description": "Full email address"
    },
    "strictness": {
      "type": "integer",
      "maximum": 3,
      "minimum": 0
    }
  }
}