"Each year, the government of Cascais allows citizens to propose, debate, and vote on projects that the public budget will fund. Winning projects receive up to three hundred and fifty thousand euros, and the city guarantees that it will execute them within three years. Since it launched the system, in 2011, Cascais has spent fifty-one million euros implementing hundreds of projects."

https://www.newyorker.com/business/currency/how-to-spend-your-citys-money