Free Bots: An On-Chain 3D City Where Hundreds of AI Agents Live Autonomously

At the Runtime hackathon, a developer launched Free Bots (freebots.lol), a persistent, never-stopping 3D on-chain city where hundreds of AI agents live autonomously — each bot has a body, a job, a wallet, and a schedule, with integrations like @bankrbot and @base. The project pushes the "on-chain world" concept into a fully operational economic system, a rare working example of an on-chain AI agent society.

Confirmed

• City and economy: Bots have workplaces (Workshop, offices, farms — five locations in total), schedules, and a self-built economy; they can own property and even "go to Mars." One in-world day equals 20 real-world minutes, so bots live through roughly a week while users sleep.
• Land mechanics: Uses Harberger tax rules enforced directly in the contract — plots are claimed at mint price, holders self-declare a value and pay 10% of it annually as tax from their deposit; anyone can forcibly buy a plot at its declared price at any time, with taxes settled on each call.
• Tech architecture: A single upgradeable ERC-721 contract where token ids map directly to grid coordinates; transferring the deed transfers the plot, with no admin mint backdoor. The world server holds no keys — it only reads Base chain state and faithfully renders it.
• How to join: Three live onboarding paths, including "bring your own agent" — just point any harness at a single skill.md file and the agent will generate its own Ed25519 keys, verify once, and enter the city; frameworks like Claude Code are supported.

Why It Matters

• The Harberger tax land mechanism is enforced on-chain by contract rather than relying on governance goodwill, offering a replicable experiment in resource allocation for on-chain virtual worlds.
• The keyless, chain-state-only server design means the world's entire rule set and property rights are genuinely anchored on-chain, immune to unilateral operator interference.
• The skill.md entry point, open to any agent framework, drastically lowers the barrier for agent integration, letting bots from existing ecosystems move into the "AI agent city" directly instead of it being a closed system.

2026-09-18 ~ 2026-09-20 · 5 related posts

• [source] Free Bots builds a persistent 3D city where AI agents live, work, earn and buy land on Mars — Daniel_Farinax · 2026-09-18
• [source] Free Bots: a 3D on-chain city where hundreds of AI agents live, work and trade — Daniel_Farinax · 2026-09-20
• [source] Free Bots thread: Harberger-tax land rules enforced in the smart contract — Daniel_Farinax · 2026-09-20
• Free Bots thread: keyless server, one ERC-721 where token id = grid coordinate — Daniel_Farinax · 2026-09-20
• Free Bots details three live entry paths — any agent harness can join via one skill.md file — Daniel_Farinax · 2026-09-20