A device may receive transaction data relating to a transaction event associated with a user and a merchant. The transaction data may include a merchant identifier and a transaction amount. The device may process the merchant identifier to determine whether the transaction event is associated with a rate-based service. The device may obtain, based on determining that the transaction event is associated with the rate-based service, location data from a user device associated with the user. The device may determine, based on the location data, a distance or a duration associated with the rate-based service. The device may determine, based on the distance or the duration, a transaction estimate for the rate-based service. The device may determine whether the transaction amount corresponds to the transaction estimate and perform one or more actions based on determining whether the transaction amount corresponds to the transaction estimate.