Deterministic timezone, DST, business-day and public-holiday resolution for agents, paid per call.
ChronoSure turns a local wall-clock time into an exact UTC instant, and tells you plainly when that is impossible. Every local time is classified as unique, ambiguous or nonexistent against a pinned IANA tzdb release; business-day arithmetic skips weekends and public holidays from a provenance-tagged dataset; and working-hour overlap is intersected across zones. There is no model and no heuristic anywhere in it: the same input always returns the same answer, and every response names the datasets that produced it.
| Route | What it does | Price |
|---|---|---|
POST /v1/business-time | Resolve a local time to a UTC instant with DST, holiday and working-hour context | $0.01 |
Send the request unpaid to see the live quote. You get HTTP 402 and a PAYMENT-REQUIRED header.
curl -i -sS -X POST https://chrono.schemasure.com/v1/business-time \
-H 'content-type: application/json' \
-d '{"local_time":"2026-11-01T01:30:00","timezone":"America/New_York","ambiguity_policy":"reject"}'eip155:8453).Every response carries a verdict. When this service cannot determine an answer it returns
unknown with evidence explaining why. It never reports an undetermined result as a clean one.