avg $1,230/day on Polymarket. it comes from changes in the weather forecast, which is free and open to everyone. the setup guide is in this post the market already prices the forecast itself pretty accurately. the money shows up the moment the forecast changes and the price hasn't yet. how it works in practice: when a new forecast for the next day comes out and the temperature in it moved by at least 0.5°C, you buy the option one degree closer to the new forecast. say the morning forecast promised 16.8°C in London, so the 17°C option is the priciest. in the afternoon a new forecast comes out with 15.8°C. your job is to buy 16°C while it's still cheap. the buy range where the EDGE holds: 5¢ to 60¢. the faster you do it, the higher your ROI how to set it up: 1 - get forecasts for free on Open-Meteo. it has the american GFS model and the european ECMWF. use the airport coordinates, that's where Polymarket measures the temperature. 2 - the bot should check on a timer whether a new forecast is out, and if it is, compare it to the previous one. 3 - if tomorrow's high moved by 0.5°C or more, the bot buys the option one degree closer to the new forecast. 4 - keep each trade under $25. cheap sellers on these markets are thin, and more size will eat the edge. one bot trades these forecast shifts across 50 cities every hour. in september that's avg $1,230/day here's the profile: