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Cash (also called money, especially prior to Bloons TD 4) is the main currency in the Bloons TD series and some spinoffs when playing a map. It is primarily used to buy towers and upgrades. Cash can be obtained through various means, but is usually gained by popping Bloons.
Starting cash is the amount of cash a player starts a game with. In most Bloons TD games, the player starts with $650, though some game modes alter this. In Bloons Monkey City, the player starts with $350, which increases by $100 per City Level gained, up to a maximum of $4,250.
In most games other than Bloons TD Battles and Bloons TD Battles 2, each layer of Bloon popped grants the player cash. This amount typically starts at $1 per layer, but starting in Bloons Tower Defense 3 Bloons popped in later rounds may grant less cash than usual.
Some towers and Heroes can also grant the player extra cash from popping Bloons; prior to Bloons TD 6 this is limited to the Monkey Town and Bloon Trap upgrades, but Bloons TD 6 also contains several other examples including the Pirate Lord's MOAB Takedown ability, the Bounty Hunter's Marked to Pop ability, and the Alchemist'sLead to Gold and Rubber to Gold upgrades. Lastly, Obyn Greenfoot's Wall of Trees ability can grant extra cash, functioning very similar to Bloon Traps. Benjamin's Bloon Trojan and Syphon Funding abilities can also grant extra cash, though these can instead lose cash if not used carefully.
In Bloons TD Battles and Bloons TD Battles 2, cash is not normally gained by popping Bloons or at the end of each round. Instead, cash is gained at fixed intervals based on the player's income, which can be modified by using Bloon sends.
Income per round: $90 per bloon (level 1+), $140 per bloon (level 2+), $250 per bloon (level 8+), $1000 per bloon (level 11+), $2500 per bloon (level 15+), $5000 per bloon (level 17+)
Bank Hack: +5% income (level 5+), +12% income (level 9+) for Monkey Banks
Skimming: $1 per bloon (level 6+), $2 per bloon (level 12+)