Even better: Mandate them to upload the data to some government system and let them provide a central API, transparency reports, ... Germany did this for gas s

Even better: Mandate them to upload the data to some government system and let them provide a central API, transparency reports, ... Germany did this for gas stations: > Since 31 August 2013 companies which operate public petrol stations or have the power to set their prices are obliged to report price changes for the most commonly used types of fuel, Super E5, Super E10 and Diesel "in real time" to the Market Transparency Unit for Fuels. https://www.bundeskartellamt.de/EN/Economicsectors/MineralOil/MTU-Fuels/mtufuels_node.html https://www.bundeskartellamt.de/EN/Economicsectors/MineralOi...