After his last startup, Framed Data, was acquired by Square, Thomson Nguyen began exploring new ideas. While an entrepreneur-in-residence at Kleiner Perkins, Nguyen interviewed hundreds of small business owners and realized that many pay hundreds of dollars in fees to maintain a business checking account. “Most small businesses are low margin, high cash flow, so they don’t have $4,000 just laying around,” Nguyen told TechCrunch. “We found in our analysis that micro-SMBs actually end up paying on average $450 in overdraft fees a year.” Nguyen’s new startup Hatch recently launched…