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Norskekysten Ny-Ålesund Longyearbyen National
API for water level data which provides water level data, forecasts, tidal predictions, projected sea level changes and information about vertical levels/datums. 

Water level data, forecasts, tidal data, and vertical reference levels can be either data for a given station or modelled data adjusted to best fit a given location: 

Station data are the water level data observed at this location or the derived products from this observation, such as tidal predictions, vertical levels, or forecasts. Currently, no raw sensor data is available, just the derived time series based on these sensor data. Station data also includes statistics like the lowest/highest and mean values for each month and year.

For any other location, you get our best estimation of water levels, forecasts, tides, and vertical levels for the given position. These are model data, computed on the fly based on the station data, given a set of rules and parameters for adjusting the data to this location. The set of rules are based on polygons (tidal zones) with parameters and can be obtained from the API. (Currently the location data or levels do not include the polygon they are valid for.)
API for water level and tides