Time Zones & Business Days
Computed from the IANA tz database (public domain) and published holiday rules. No upstream calls.
- cost
- Free tier 4 of 5 free
- after that
- from $0.001 / call · card or USDC
- endpoints
- 5
No signup needed over MCP: 50 free calls a day, or 500 with a free key.
Business days (any country) Free
Count business days between two dates, or add business days to a date, skipping weekends and the country's public holidays.
- cost
- Free then $0.001 / call
- MCP tool
- time__business-days
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/time/business-days
| Param | Type | Description |
|---|---|---|
| country | string | ISO country code |
| from | string | Start date YYYY-MM-DD |
| to? | string | End date YYYY-MM-DD (count mode) |
| days? | integer | Business days to add (add mode; negative goes back) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/time/business-days?country=DE&from=2026-12-18" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/time/business-days?country=DE&from=2026-12-18"
by fourzerotwo
Report this endpoint
Convert a local time between zones Free
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).
- cost
- Free then $0.001 / call
- MCP tool
- time__convert
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/time/convert
| Param | Type | Description |
|---|---|---|
| time | string | Local time YYYY-MM-DDTHH:MM[:SS], no offset |
| from | string | IANA zone of that time |
| to | string | IANA zone to convert to |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/time/convert?time=2026-10-25T01%3A30&from=Europe%2FLondon&to=America%2FNew_York" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/time/convert?time=2026-10-25T01%3A30&from=Europe%2FLondon&to=America%2FNew_York"
by fourzerotwo
Report this endpoint
Current time in a zone Free
Local time, UTC, offset, abbreviation, DST flag, weekday and ISO week for a zone.
- cost
- Free then $0.001 / call
- MCP tool
- time__now
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/time/now
| Param | Type | Description |
|---|---|---|
| zone? | string | IANA zone (default UTC) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/time/now" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/time/now"
by fourzerotwo
Report this endpoint
Paid test call
Server UTC time and a request id. The cheapest paid endpoint: use it to test an x402 payment end to end.
- cost
- $0.001 / call card or USDC
- MCP tool
- time__signed
- method
- GET
$0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/time/signed
# returns 402 with the price; pay with USDC (x402) or a key with card credit
curl -i "https://fourzerotwo.si/v1/time/signed"
curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/time/signed"
by fourzerotwo
Report this endpoint
Time zone facts Free
Offset, abbreviation and DST at a moment, plus the next clock change, for an IANA zone.
- cost
- Free then $0.001 / call
- MCP tool
- time__zone-info
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/time/zone-info
| Param | Type | Description |
|---|---|---|
| zone | string | IANA zone |
| at? | string | Date/time to evaluate (default now) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/time/zone-info?zone=Australia%2FSydney" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/time/zone-info?zone=Australia%2FSydney"
by fourzerotwo
Report this endpoint
IANA Time Zone Database (public domain); holiday rules via Yasumi (MIT).