Abstract: Online retailers may operate one or more services configured to detect requests generated by automated agents. A CAPTCHA may be transmitted in response to requests generated by automated agents. The CAPTCHAs may include queries requesting market data corresponding to items offered for sale on an electronic commerce website operated by the online retailer. The response to the queries may be stored by one or more services of the online retailer and used as market data for the electronic commerce website. The market data may be used to notify customers about one or more items offered for sale on the electronic commerce website.

Abstract: Online retailers may operate one or more services configured to detect request generated by automated agents. A security check may be generate and transmitted in response to requests generated by automated agents. The security checks may be transmitted to a second device registered with the online retailer. The second device may transmit the completed security check to the online retailer for verification before the online retailer processes the request.