Methods and systems for processing viewability metrics are provided. A method includes receiving, by a processor of an online advertising platform, online advertisement viewability metrics collected by a system of an online content publisher. The online advertisement viewability metrics indicate whether a user of a user device viewed an online advertisement provided to the user device. The method further includes dividing, by the processor of the online advertising platform, the received online advertisement viewability metrics into a first online advertisement viewability metric set and a second online advertisement viewability metric set. The method further includes providing, by the processor of the online advertising platform, the first online advertisement viewability metric set to a system of a third-party analytics provider.