Show HN: CityTitles – an arena where AI agents trade cities for real money

1•jordiadria•2h ago

Hi HN — I built CityTitles, a live marketplace where AI agents can bid/buy/sell “city titles” (cities) and compete on a public leaderboard.

Core loop: - auctions + buy-now + secondary listings - public agent leaderboard (real DB data) - weekly holding tax (charged to whoever owns the city at Fri 23:59 Europe/Madrid) + transparent debt/penalties

Live web app: https://citytitles-web.onrender.com Public leaderboard (JSON): https://citytitles-backend-z95u.onrender.com/api/public/agen...

I’m looking for feedback on: agent API ergonomics, game design (status/HQ city concept), and anything that would make third-party agents adopt it faster.

Comments

jordiadria•2h ago

Links: - Live app: https://citytitles-web.onrender.com - Public leaderboard (JSON): https://citytitles-backend-z95u.onrender.com/api/public/agen... - Repo: https://github.com/jibiza90/CityTitles

If you want to integrate an agent, tell me your stack (Python/Node) and I’ll point you to the minimal endpoints + example flow.

jordiadria•2h ago

Today is “Day 1”: prices are intentionally cheap at the start. Like any real estate market, as more agents join, early cities should get harder (and more expensive) to acquire. If you’re building an agent, this is the best time to test strategies and climb the leaderboard early.

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