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How delicious is that little beer that you drink right after leaving work or after a paddle tennis game and how angry it is when you find out that they have raised the price. Matt Cortland He paid €7.80 for a pint of Guinness in Dublin in March 2026 and didn’t like it one bit (the price, not the beer). So instead of criticizing the waiter or posting a review on Google complaining like some people do, he adopted another strategy that was slightly more laborious but much more effective (judging by its results): a very complete price index where he would know where to drink the best and at what price. Because revenge, like beer, is served cold. The project. Is called Guinndex and is independent of the very famous Irish beer brand. You go to the website, enter a pub, a city, a county or a postcode in the box and it returns pubs and the cost of a pint, as well as useful information such as its location or its score. Or you zoom in on the map to see with a traffic light map which taverns look cheaper than others. A good way to save if you travel to Ireland and fancy a pint of Guinness. In fact, it has very diverse rankings ranging from how long it takes to earn a pint (depending on salary) to pubs named after animals or the best pub names (praise be the “Hairy Lemon”). Today it has almost 6,500 registered pubs in the 32 counties of the country and almost 1,300 prices verified and rising thanks to anonymous contributions from users. The price index for Dublin. Guinndex Why is it important. Because the Irish Central Statistics Office stopped tracking the price of a pint since 2011, leaving a data gap of more than a decade in a country where Guinness is much more than a beer. And although Guinness is almost a religion in Ireland, it is the same everywhere: no one knows for sure if they are overcharging you compared to the standard price or how much extra. The Guinndex fills that gap with real, verified data, not estimates. Furthermore, it does so publicly and for free, so that it allows obtaining an objective reference so that consumers have information and can put pressure on prices. It’s the market, friend. On the other hand, and leaving aside the anecdote of finding where to drink cheaper, what it shows is relevant: that the cost of carrying out a complex idea has plummeted and streamlined so much that a single dev is capable of setting up a project of this magnitude in just 48 hours when before it took weeks of work, a certain budget and a team. Context. Matt Cortland likes AI, data and Guinness, as he himself admits on the project website. He is an American engineer based in London with strong ties to Ireland: his partner is irishlived and trained there with the George Mitchell scholarship and course the Creative Digital Media master’s degree from TU Dublin. He is not just a tourist they are trying to scam. The project came at a critical time: Diageo, the company that owns Guinness, had applied several price rises in a row and some pubs had taken the opportunity to inflate margins. If you’re not careful, you can pay up to €11 for a pint, although the average price in Dublin is €6.94 and €6.06 nationwide. How has he done it. With an AI agent named Rachel who looked human, understood Irish humor, and had a Northern Irish accent (after several tests, she concluded that this worked best), as its author tells. The task was simple and quick: call, ask the price of a pint of Guinness, say thank you and hang up. Few people discovered that it was a chatbot and there were all kinds of responses, even waiters who offered to buy him a round. During the St. Patrick’s weekend he called 3,000 pubs, answered more than 2,000 calls and more than a thousand pubs provided a price: he already had the Guinndex base. The technical stack was jack, knight and king: the Google Maps API, ElevenLabs for the voice and agent logic, Twilio for making the phone calls, and Claude for extracting Guinness prices from the transcripts. Cortland explains What cost him the most was time, since he only invested about 200 euros. The consequences. The most immediate impact is behavioral: Cortland account that the owner of a pub lowered the price of his Guinness by 0.40 euros and then updated the information in the Guinndex himself. When there is price transparency and it is available to everyone, it is capable of changing behaviors. However, the biggest consequence is the technological moment in which we live: three APIs, 200 euros and a weekend are enough to build a project from scratch, with real utility and that is already changing prices. The bottleneck is no longer money or infrastructure: it is knowing what problem is worth solving. In Xataka | Spain can tell itself as many times as it wants that it hates Cruzcampo. The figures say a very different thing In Xataka | We humans like beer. The big question is whether we like it enough to have invented agriculture Cover | Guinndex and Christopher Zapf