Time zones and world business days, VAT rates and maths, currency conversion, UK business days…
Connect Remote server
claude mcp add --transport http tools https://fourzerotwo.si/mcp/v/tools --header "X-API-Key: <X_API_KEY>"
{
"mcpServers": {
"tools": {
"url": "https://fourzerotwo.si/mcp/v/tools",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}
{
"servers": {
"tools": {
"type": "http",
"url": "https://fourzerotwo.si/mcp/v/tools",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://fourzerotwo.si/mcp/v/tools
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 18 found in our last check
calculators__uk-business-daysIs 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.
calculators__postcode-distanceStraight-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__currency-convertConvert 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.
time__convertConvert 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__nowLocal 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__zone-infoOffset, 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.
time__business-daysCount 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__signedServer 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.
uk-bank-holidays__allEvery published UK bank holiday by division. Free within the daily allowance, then $0.001 USDC per call via x402.
uk-bank-holidays__england-and-walesBank holidays in England and Wales. Free within the daily allowance, then $0.001 USDC per call via x402.
uk-bank-holidays__scotlandBank holidays in Scotland. Free within the daily allowance, then $0.001 USDC per call via x402.
uk-bank-holidays__northern-irelandBank holidays in Northern Ireland. Free within the daily allowance, then $0.001 USDC per call via x402.
vat__ratesStandard, 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__calculateNet 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__validate-formatCountry 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.
holidays__yearOfficial 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.
holidays__checkIs 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__countriesEvery country and regional provider supported. Free within the daily allowance, then $0.0005 USDC per call via x402.
Headers
| Name | Description |
|---|---|
X-API-KeyOptional, secret | Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day) |
Details
| Endpoint | https://fourzerotwo.si/mcp/v/tools (Streamable HTTP) |
| First published | 11 Oct 2026 |
| Last updated | 11 Oct 2026 |
| Registry name | si.fourzerotwo/tools |
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