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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "tools": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/tools",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

claude mcp add --transport http tools https://fourzerotwo.si/mcp/v/tools --header "X-API-Key: ${X_API_KEY}"

[mcp_servers.tools]
url = "https://fourzerotwo.si/mcp/v/tools"
env_http_headers = { "X-API-Key" = "X_API_KEY" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tools": {
      "type": "remote",
      "url": "https://fourzerotwo.si/mcp/v/tools",
      "enabled": true,
      "headers": {
        "X-API-Key": "{env:X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "tools": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/tools",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=tools&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vZm91cnplcm90d28uc2kvbWNwL3YvdG9vbHMiLCJoZWFkZXJzIjp7IlgtQVBJLUtleSI6IiR7WF9BUElfS0VZfSJ9fQ%3D%3D"
}

{
  "servers": {
    "tools": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/tools",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "tools": {
      "httpUrl": "https://fourzerotwo.si/mcp/v/tools",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

extensions:
  "tools":
    enabled: true
    name: "tools"
    type: streamable_http
    uri: "https://fourzerotwo.si/mcp/v/tools"
    headers:
      "X-API-Key": "${X_API_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${X_API_KEY}. The registry never accepts secret values.

Quality 91 / 100strong

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

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 hygiene100 · 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.annotations18 of 18 tools declare readOnlyHint or destructiveHint
pass
tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
pass
tools.token_costabout 2,126 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

18 tools, about 2,126 tokens to load them all · tool set 51afd0c6f28c · checked 2026-10-19 23:18 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 82 / 100

no-repository

provenance55

liveness98

freshness100

hygiene80

+dns-namespace +website +reachable +uptime-94% +updated-8d-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://fourzerotwo.si/mcp/v/tools` streamable-http	none	yes	94%	621 ms	2025-11-25	2026-10-19

Tools (18)

`calculators__currency-convert`read-only	Convert between ~30 currencies at the ECB reference rate for today or any date in the last 90 days. Free within the daily allowance, then $0.001 USDC per call via x402.
`calculators__postcode-distance`read-only	Straight-line distance (km and miles) and compass bearing between two UK postcodes. Free within the daily allowance, then $0.002 USDC per call via x402.
`calculators__uk-business-days`read-only	Is a date a UK business day; add or subtract N business days; count business days between dates. Uses official bank holidays per nation. Free within the daily allowance, then $0.001 USDC per call via x402.
`holidays__check`read-only	Is a date a public holiday or business day in a country; add N business days; next business day. Free within the daily allowance, then $0.001 USDC per call via x402.
`holidays__countries`read-only	Every country and regional provider supported. Free within the daily allowance, then $0.0005 USDC per call via x402.
`holidays__year`read-only	Official public holidays for a country (or region provider, e.g. Germany/Bavaria) in a year. Free within the daily allowance, then $0.001 USDC per call via x402.
`time__business-days`read-only	Count business days between two dates, or add business days to a date, skipping weekends and the country's public holidays. Free within the daily allowance, then $0.001 USDC per call via x402.
`time__convert`read-only	Convert a wall-clock time from one IANA zone to another; says when it is ambiguous (clocks go back) or never happens (clocks go forward). Free within the daily allowance, then $0.001 USDC per call via x402.
`time__now`read-only	Local time, UTC, offset, abbreviation, DST flag, weekday and ISO week for a zone. Free within the daily allowance, then $0.001 USDC per call via x402.
`time__signed`read-only	Server UTC time and a request id. The cheapest paid endpoint: use it to test an x402 payment end to end. Costs $0.001 USDC per call via x402.
`time__zone-info`read-only	Offset, abbreviation and DST at a moment, plus the next clock change, for an IANA zone. Free within the daily allowance, then $0.001 USDC per call via x402.
`uk-bank-holidays__all`read-only	Every published UK bank holiday by division. Free within the daily allowance, then $0.001 USDC per call via x402.
`uk-bank-holidays__england-and-wales`read-only	Bank holidays in England and Wales. Free within the daily allowance, then $0.001 USDC per call via x402.
`uk-bank-holidays__northern-ireland`read-only	Bank holidays in Northern Ireland. Free within the daily allowance, then $0.001 USDC per call via x402.
`uk-bank-holidays__scotland`read-only	Bank holidays in Scotland. Free within the daily allowance, then $0.001 USDC per call via x402.
`vat__calculate`read-only	Net to gross or gross to net at a given rate, or at a country's standard rate. Free within the daily allowance, then $0.001 USDC per call via x402.
`vat__rates`read-only	Standard, reduced and super-reduced VAT rates for one country or all of EU27 + UK, with the date they were checked. Free within the daily allowance, then $0.001 USDC per call via x402.
`vat__validate-format`read-only	Country format and check digit for UK (GB/XI) and EU VAT numbers. Does not confirm registration. Free within the daily allowance, then $0.001 USDC per call via x402.

Schemas: list_tools.

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Official server.json

{
  "name": "si.fourzerotwo/tools",
  "title": "Everyday agent tools",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://fourzerotwo.si/mcp/v/tools",
      "type": "streamable-http",
      "headers": [
        {
          "name": "X-API-Key",
          "isSecret": true,
          "description": "Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day)"
        }
      ]
    }
  ],
  "version": "1.0.1",
  "websiteUrl": "https://fourzerotwo.si",
  "description": "Time zones and world business days, VAT rates and maths, currency conversion, UK business days…"
}