Guardian Analytics, a Los Altos, Calif company focused on helping financial institutions prevent online fraud, said it has raised $4.5 million in a second round of financing.

Foundation Capital led the investment, and follows the firm’s earlier $1.25 million seed investment in the two-year old company.

The company provides banks, credit unions and brokerages with analytics of online user behavior to detect fraud threats, and advises them how to respond.

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