SACRAMENTO, Calif. - InsWeb Corp. has countersued eHealthInsurance Services Inc., which provided health care information on a Web site they had shared.

The lawsuit, announced last Thursday, came about a month after eHealthInsurance of Sunnyvale, Calif., sued InsWeb, alleging that it had failed to perform its obligations. At that time eHealthInsurance terminated a two-year agreement, signed last April, that had made it the cobranded site's exclusive provider of individual health, small-group health, and Medicare supplement insurance quotes.

As a result of that agreement, InsWeb said, it had stopped operating its own online health insurance marketplace.

In a press release, InsWeb denied allegations that it breached an online-distribution agreement with eHealthInsurance; the countersuit requests compensation for damage allegedly caused by eHealthInsurance's "early and improper termination of their agreement."

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