The HTTP API returns (a JSON representation of) a Monte Carlo simulation object — according to a single schema regardless of whether the input was given in spreadsheet or Probly format.
Every simulation has a unique URL, which can be shared with others. Please don't rely on this for critical work, as old URLs may break or disappear from time to time.
The 'Dag' in 'Dagger' stands for directed acyclic graph. The 'ger' is of indeterminate meaning.