Reliability for changing figures comes down to three things: a direct official source, a visible last-reviewed date, and never presenting an old figure as permanently valid.
If a rate, limit, fee, or price varies by bank, Banky makes that clear and directs the reader to the official source instead of inventing one fixed number.
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.