Yuso offers an API that allows users to request hourly and quarter-hourly prices. To request quarter-hourly prices, the parameter agg (qh) must be used. For hourly prices, the parameter agg (h) must be used.
Nordpool also offers an API that allows any registered user to request Day Ahead prices for a region of their choice. From 1 October 2025, quarter-hourly prices will be available for this API.
You can find the API via this link on the Nordpool website. You need a token to activate the API, which you can find via this link.
Programming support can be found via this link.