JPMorgan Chase & Co. says it's the first dealer to give clients sophisticated outside analysis of their currency trades, betting they will like what they see and become repeat customers.

The bank has teamed with a London startup called BestX to inspect JPMorgan's algorithms, giving outside confirmation they're functioning as intended. The world's second-largest currency trader says the independent, third-party analysis will be available to customers on Feb. 1.

Trading titans are rolling out new ways to dissect and analyze trading as they compete for a bigger slice of the $5.1 trillion-a-day currency market. The services, typically known as transaction cost analysis, come amid mounting regulatory pressure on asset managers to prove they're not overcharged by brokers. It also highlights how devilishly difficult it can be to determine fair pricing in the relatively opaque currency market.