apimark APIs coming soon
We're building focused, reliable APIs for jobs that are surprisingly easy to get wrong. Each will have a free tier, clear limits and honest pricing. Interested in one? Let us know, because demand decides what ships first.
Proration API
Correct mid-cycle upgrade, downgrade and credit amounts across billing rules.
Webhook Verify API
Verify Stripe, GitHub, Shopify and Slack webhook signatures, then store and replay failed deliveries.
LLM JSON Guard
Validate AI output against a JSON Schema, repair malformed JSON and return precise errors.
Cron API
Explain cron expressions, compute the next runs and convert time zones.
Business Days API
Public holidays for 100+ countries, adding working days and SLA deadlines.
Recurrence (RRULE) API
Expand recurring-event rules with time zones and daylight-saving handling, and detect conflicts.
Chargeable Weight API
Volumetric versus actual weight with carrier divisors, rounding and multi-box totals.
Carton Packing API
3D bin packing that picks the fewest boxes and reports how full each one is.
Unit Parse API
Parse "2½ cups" or "5'11\"" into numbers and units, with conversions.