Tech Entrepreneur Uses AI ‘Agent’ to Drive Down Guinness Prices in Ireland
A high-tech approach to pub culture is yielding tangible economic results across Ireland. Matt Cortland, a 37-year-old startup founder, has launched the “Guinndex,” a crowdsourced, AI-powered price index that is credited with pushing the cost of a pint of stout downward in bars nationwide. The project, which uses an AI agent named “Rachel,” has brought much-needed transparency to a market that had lacked official data for over a decade.
The initiative began in early March 2026 after Cortland expressed frustration over paying €7.80—approximately $8.93—for a single pint of Guinness in Dublin. Seeking context, he turned to Ireland’s Central Statistics Office, only to discover that the government agency had ceased tracking the price of a pint in 2011. Determined to fill the data vacuum, Cortland spent just €200 to build and deploy Rachel, an AI caller modeled after the winner of the UK reality show The Traitors, Rachel Duffy.
Using Anthropic’s Claude AI for voice integration and data analytics, Rachel successfully queried 3,000 pubs across the island during the busy St. Patrick’s Day weekend. Of those calls, 2,052 were connected, with over 1,000 bartenders inadvertently revealing their price points to the software. The recorded data shows a stark variance: while the national average hovers near €6.01, prices in tourist-heavy districts like Dublin’s Temple Bar can reach as high as €10.
Key milestones of the Guinndex project include:
- Increased Transparency: The public-facing database at guinndex.ai allows for crowdsourced updates to ensure pricing remains accurate.
- Market Correction: Following the public release of the index, numerous pubs have slashed prices that previously exceeded €7 down to €6 or lower.
- Positive Industry Reception: Many bartenders, unaware they were speaking to an AI, responded with hospitality, with some even offering to comp a drink for patrons struggling with the cost.
The human element of the experiment has been particularly notable. In one instance, a pub owner in Kilkenny reportedly dropped his price by €0.40 after learning of the index. “Listen, they’re normally €6.20, but if you can’t afford one, we’ll buy you one. We’ll look after you,” one Irish bartender told the AI.
“I was like, ‘Well, can I just call every pub in Ireland and conversationally ask them with AI?’ I pulled the thread, and I just kept pulling the thread, and here we are,”
— Matt Cortland, Startup Founder
Cortland emphasizes that his project is not an attack on business owners, but rather a tool for consumer awareness. “If you’re charging €11 for a pint of Guinness, that’s fair enough,” Cortland said. “But people should know that information.”
Looking ahead, the entrepreneur plans to scale the technology. He is already exploring ways to apply the same AI-driven transparency model to other consumer sectors, such as the rising cost of pizza in New York City or the complex pricing structures of prescription drugs in the United States.
