BufferBox HD Trade Services Instacart Keychain Logistics Swapbox Octopart Upverter CircuitHub CircuitLab Clerky Wevorce Lawdingo Watsi Prizeo Amicus FarmLogs With each successive round, Y Combinator frequently funds new markets of startups that solve existing problems for other YC companies and the greater startup ecosystem.  I’ve recently been able to identify sixteen such companies in five [...]