There are provided systems and methods for automated data tokenization through networked sensors. A network of data sensors may detect that a user is likely to engage in electronic transaction processing with a merchant device, for example, based on an action performed by the user and/or with a user device. One or more of the sensors may connect with the user's device and retrieve financial data from the device and/or data necessary to issue a token to the device for transaction processing. The sensor may perform a background process to issue the token to the device, and once onboarded, may store the token to the user's device and/or the merchant device that the user is likely to interact with for transaction processing. The token may be limited in use by location and/or amount, or may be used to fully onboard the user with the token service provider.