The ATP now ensures a Guaranteed Base Earnings system for the top 250-ranked singles players each season. The ATP will make up the difference if a player’s prize money falls below the set thresholds. For the 2024 season, the guaranteed amounts are as follows: £300,000 for the Top 100, £150,000 for ranks 101-175, and £75,000 for ranks 176-250.
https://www.perfect-tennis.com/prize-money