A Series B funding round has provided $57 million to startup Brex, which has created a Visa corporate card product to be used by other venture-funded startups. Brex uses bank and investor data, supplemented by review of spending pattern and daily information feeds regarding cash on hand, to create what it calls a dynamic credit limit—one that changes daily based on the startup’s bank account balance. While working with startups is inherently risky, there is a predictability of spending patterns among members of this group, which helps with risk management. The Visa card, which is iss...