Every character on Jiǎoluò Shūwū read as cai in any tone — 2 readings total across the four tones. Pick the tone you mean.
If you have the sound cai but not the character, here are the 2 characters read this way: 才 (cái, talent, ability, only-then, not until), 菜 (cài, vegetable, dish, cuisine). They split across 2 tones, so the tone is what separates them.