Prosus, a global technology investor, is in talks to acquire a 5% stake in the Indian cab-hailing platform, Rapido.The deal is expected to be a fully secondary transaction at a flat valuation of $1 billion.Rapido's early investors, including AdvantEdge and angel investors, are looking to sell part of their stake.Prosus has started the due diligence process, and a 5% stake would translate to an investment of approximately $50 million.