# The Pillar

> The Pillar is a 3D open-world browser game and an advertising marketplace. A window is a licensed ad pane on its 80-floor tower, not real property and not a security.

The Pillar is owned and operated by Extensions Market (extensionsmarket.com) and created by Vladislav Gerasimchuk. Contact: contact@extensionsmarket.com.
Last reviewed: 2026-10-07

For the full, quotable knowledge base in one file, read:
- https://thepillar.io/llms-full.txt

## Product
- https://thepillar.io/advertise
- https://thepillar.io/advertise.md
- https://thepillar.io/about
- https://thepillar.io/about.md
- https://thepillar.io/facts
- https://thepillar.io/facts.md

## For AI agents: find and lease a window
- https://thepillar.io/lease : every free window and billboard with its monthly price (markdown: https://thepillar.io/lease.md)
- https://thepillar.io/api/v1/windows : the same list as JSON (filters: kind, floor, floorMin, floorMax, face, spot, maxPrice)
- https://thepillar.io/developers : API docs (markdown: https://thepillar.io/developers.md)
- https://thepillar.io/api/v1/leases : start a lease (POST; returns a Stripe checkout link for the person to pay, after a content check)
- https://thepillar.io/mcp : MCP server (Streamable HTTP, no key) with the tools find_windows, get_window, get_prices, start_lease, check_lease
- https://thepillar.io/mcp/account : the same MCP server signed in to a person's account (OAuth): start_lease pays on their saved card within their monthly limit, with a 24-hour undo; plus my_leases and cancel_lease
- https://thepillar.io/api/v1/leases/x402 : lease with USDC on Base through x402, no account (POST; 402 with the price in PAYMENT-REQUIRED, pay, send again with PAYMENT-SIGNATURE; one month per payment)
- https://thepillar.io/openapi.json : OpenAPI 3.1
- https://thepillar.io/feeds/google.xml and https://thepillar.io/feeds/openai.jsonl : shopping feeds

## Blog
- https://thepillar.io/blog
- https://thepillar.io/blog.md
- https://thepillar.io/blog/rss.xml
- https://thepillar.io/blog/free-gta-style-browser-games : Free GTA-style games you can play in a browser (markdown: https://thepillar.io/blog/free-gta-style-browser-games.md)
- https://thepillar.io/blog/gta-6-on-mac : Can you play GTA 6 on a Mac? (markdown: https://thepillar.io/blog/gta-6-on-mac.md)
- https://thepillar.io/blog/hot-and-cold-guessing-games : Hot and cold guessing games to play every day (markdown: https://thepillar.io/blog/hot-and-cold-guessing-games.md)
- https://thepillar.io/blog/advertise-clothing-brand : Why clothing brands should advertise on The Pillar (markdown: https://thepillar.io/blog/advertise-clothing-brand.md)
- https://thepillar.io/blog/company-name-on-a-skyscraper : Why every company should put its name on The Pillar (markdown: https://thepillar.io/blog/company-name-on-a-skyscraper.md)
- https://thepillar.io/blog/saas-launch-advertising : Why new SaaS launches should advertise on The Pillar (markdown: https://thepillar.io/blog/saas-launch-advertising.md)

## Legal
- https://thepillar.io/legal/terms
- https://thepillar.io/legal/privacy
- https://thepillar.io/legal/cookies
- https://thepillar.io/legal/license
- https://thepillar.io/legal/refunds
- https://thepillar.io/legal/aup
- https://thepillar.io/legal/games