Citigroup Inc., which has elected to remain in the background in business-to-business Web marketplaces, will offer payment and settlement services to users of Oracle Corp.'s OracleExchange.com.

The strategy at some other big banks is to form marketplaces - usually for corporate customers - that provide a full range of deal negotiating services in addition to payment capabilities. But Citi says it has decided to draw on its core strengths instead.

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