JPMorgan Chase on Friday agreed to purchase healthcare payments and billing processor InstaMed for over $500m, the bank’s biggest acquisition since the height of the financial crisis, according to a person with knowledge of the matter. The purchase follows a resurgence of dealmaking by the likes of Goldman Sachs, Morgan Stanley and BB&T and marks JPMorgan’s biggest takeover since it bought investment bank Bear Stearns and the retail banking assets of Washington Mutual in 2008. JPMorgan already processes more than $6tn of payments a day.