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

The bank has teamed with a London startup called BestX toinspect JPMorgan's algorithms, giving outside confirmation they'refunctioning as intended. The world's second-largest currency tradersays the independent, third-party analysis will be available tocustomers on Feb. 1.

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