Energy Cost API
Electricity cost maths as an API, computed locally and deterministically and entirely currency-agnostic. The cost endpoint works out an appliance's energy use and running cost from its power (watts or kilowatts), the hours used per day and a per-kilowatt-hour tariff — returning the kilowatt-hours and the cost per day, week, month and year, with an optional quantity of identical devices. The compare endpoint pits two appliances against each other: it computes each one's annual energy cost, the saving from the more efficient one, and — given the extra purchase price of the better model — the payback period in years and months. The convert endpoint relates watts, hours and kilowatt-hours: give any two and it returns the third, plus the cost at a tariff. Everything is computed locally and deterministically, so it is instant and private. Kilowatt-hours equal power in kilowatts times hours, and cost equals kilowatt-hours times the rate; months use 365/12 days. Ideal for energy-saving and smart-home apps, appliance comparison and retail tools, sustainability dashboards, and budgeting software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is energy-cost maths; for battery capacity and runtime use a battery API.
api.oanor.com/energycost-api
