All API responses that include fields with date and time use UTC time standard e.g.: released_at.
Monetary amounts as well as other decimal types which require exact precision (e.g. exchange rates) are encoded as strings. They use a decimal point as a separator (e.g. 123.45).
Monetary amounts support a precision of up to 2 decimal digits (valid: 123, 123.45; invalid: 123.456).