How is this guessing made?
For each market we take the last declared ank and its cut digit (the digit 5 away: 1↔6, 2↔7 …), then add the anks that came most often in that market's recent chart. Jodis are pairs of those anks; one panna is picked for each ank.
Is this a fix number?
No. Nobody can know a matka result before it is declared. This guessing is free, for fun, and changes every day. Never pay for a fix or leak number.
When does the guessing change?
Once a day, after midnight IST. It stays the same all day, however many times you refresh.