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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "format-checker": {
      "type": "http",
      "url": "https://validate.crewofthecaptain.com/mcp"
    }
  }
}

claude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcp

[mcp_servers.format-checker]
url = "https://validate.crewofthecaptain.com/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "format-checker": {
      "type": "remote",
      "url": "https://validate.crewofthecaptain.com/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "format-checker": {
      "type": "http",
      "url": "https://validate.crewofthecaptain.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=format-checker&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vdmFsaWRhdGUuY3Jld29mdGhlY2FwdGFpbi5jb20vbWNwIn0%3D"
}

{
  "servers": {
    "format-checker": {
      "type": "http",
      "url": "https://validate.crewofthecaptain.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "format-checker": {
      "httpUrl": "https://validate.crewofthecaptain.com/mcp"
    }
  }
}

extensions:
  "format-checker":
    enabled: true
    name: "format-checker"
    type: streamable_http
    uri: "https://validate.crewofthecaptain.com/mcp"
    timeout: 300

Quality 89 / 100good

protocol88 · weight 25

pass
protocol.modernsupports 2026-07-28 (server/discover)
pass
protocol.statelessanswers without a session
pass
protocol.transportstreamable HTTP
warn
protocol.list_ttltools/list declares ttlMs 0, so clients re-fetch it on every use

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene86 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations7 of 7 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: validate_email (destructiveHint); list_types (destructiveHint, idempotentHint); validate_iban (destructiveHint); …
pass
tools.token_costabout 879 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

7 tools, about 879 tokens to load them all · tool set 24ac4654b7cf · checked 2026-10-20 05:45 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 83 / 100

no-repository

provenance55

liveness100

freshness100

hygiene80

+dns-namespace +website +reachable +uptime-100% +updated-9d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://validate.crewofthecaptain.com/mcp` streamable-http	none	yes	100%	352 ms	2026-07-28	2026-10-20

Tools (7)

`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.
`validate_email`read-only	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.
`validate_eu_vat`read-only	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.
`validate_iban`read-only	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.
`validate_pl_nip`read-only	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.
`validate_pl_pesel`read-only	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.
`validate_pl_regon`read-only	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.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "com.crewofthecaptain/format-checker",
  "title": "x402 Format Checker",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://validate.crewofthecaptain.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "1.3.0",
  "websiteUrl": "https://validate.crewofthecaptain.com/",
  "description": "IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base"
}