x402 Format Checker

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com.crewofthecaptain/format-checkerv1.3.0 Domain verified

IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base

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https://validate.crewofthecaptain.com/mcp

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

list_types Read-only

List the available checks, price, network and payment details (free). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.

This tool takes no arguments.

Tools (7)

list_types

List the available checks, price, network and payment details (free). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {}
}

validate_email

Email address syntax (dot-atom local part, LDH domain; no DNS). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. [email protected]

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. [email protected]"
    }
  }
}

validate_eu_vat

EU VAT number: per-country format (offline, no VIES); PL also NIP checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. PL5260250274

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. PL5260250274"
    }
  }
}

validate_iban

IBAN: country length + ISO 13616 mod-97 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. PL61109010140000071219812874

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. PL61109010140000071219812874"
    }
  }
}

validate_pl_nip

Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. 5260250274

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. 5260250274"
    }
  }
}

validate_pl_pesel

Polish PESEL: checksum + encoded birth date and sex. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. 44051401359

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. 44051401359"
    }
  }
}

validate_pl_regon

Polish REGON: 9 or 14 digits + mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Returns {type, valid, normalized, reason}; the input is never echoed or stored and personal identifiers are masked.

read-only

Argument	Type	Description
value*	string	String to check, e.g. 123456785

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "maxLength": 512,
      "minLength": 1,
      "description": "String to check, e.g. 123456785"
    }
  }
}