# Page Not Found

The URL `economy/characters/upgrades` does not exist.

You might be looking for one of these pages:
- [Characters](https://whitepaper.letmespeak.org/economy/characters.md)
- [Invites](https://whitepaper.letmespeak.org/economy/characters/invites.md)
- [Visa](https://whitepaper.letmespeak.org/economy/characters/visa.md)
- [Rarity and attributes](https://whitepaper.letmespeak.org/economy/characters/rarity-and-attributes.md)
- [Visual customization](https://whitepaper.letmespeak.org/economy/characters/visual-customization.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://whitepaper.letmespeak.org/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://whitepaper.letmespeak.org/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/economy/characters.md`)
- Use `Accept: text/markdown` header for content negotiation