Is the FIPE value what I'll actually get for selling my car?
Not necessarily: the table measures the average negotiated price for that model and year on the market, a starting point for negotiation, not an appraisal of your specific car, which can be worth more or less depending on condition, mileage, and history.
Why does the same FIPE code show a different price every month?
Because the table is republished monthly by Fundação Instituto de Pesquisas Econômicas from market research, and the referenceMonth field changes with every edition, even when the vehicle's code stays the same.
What does the digit after the hyphen in a FIPE code mean?
It's a check digit the table appends to the 6-digit sequential code for the brand, model, and year combination; it doesn't indicate the vehicle type, since cars and motorcycles both use varied digits in that position.
Why do I have to pick brand and model before seeing the year?
Because the lookup follows a cascade: each level (type, brand, model, year) depends on the previous choice to filter the next set of options, until it reaches the reference price for the exact vehicle selected.