isDayOff()
isdayoff.ru
A REST API that returns whether a given date is a working, non-working, or short day for Russia, CIS countries, the USA and others.
The isDayOff() API terms not fully documented by the vendor. Verified 2026-07-12 with per-field source links.
Base URL
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no sourceAuth
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no sourceFree tier
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no sourcePricing model
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no sourceRate limits
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no sourceOpenAPI spec
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no sourceMCP server
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