Guinndex is a data project and crowdsourced platform that uses AI to collect and analyze the prices of pints of Guinness across Ireland. Founded by AI engineer Matt Cortland, the initiative aims to fill a data gap left by the Central Statistics Office and provide transparency to consumers and potentially help normalize pint prices. The project utilizes an AI voice agent named Rachel to call pubs and gather pricing information, which is then made publicly available on guinndex.ai. The platform also encourages user contributions to expand the dataset.