> ## Documentation Index
> Fetch the complete documentation index at: https://docs.b3.fun/llms.txt
> Use this file to discover all available pages before exploring further.

# Architecting the onchain economy

B3OS, Labs, and Holdings form the operating loop behind B3 products, protocol infrastructure, and value accrual for $B3.

**[Start with B3OS](/protocol/b3os)**

B3 is increasingly centered around B3OS: the workflow operating system used to connect wallets, smart contracts, integrations, actions, triggers, and Caddie-assisted automation.

## Three engines, one loop

B3 is a system for shipping and scaling onchain products. B3OS powers the workflow layer, Labs ships products on top, and Holdings expands the ecosystem through strategic investments.

**[B3OS](/protocol/b3os)**

The onchain workflow engine for apps, services, wallets, smart contracts, and automations.
  **[Labs](https://b3.fun/labs)**

The product studio behind Bsmnt, HypeDuel, B3AR, XCade, AnySpend, Upside.Win, Parallel Sanctuary, B3PC, and more.
  **[Holdings](https://b3.fun/holdings)**

Strategic investments in high-growth, cash-flowing businesses that complement B3OS and the broader B3 economy.

B3 was built by a small team of former Coinbase leaders combining Web2 product discipline with onchain systems engineering.

## Build On B3

Use the B3 docs for protocol, SDK, and API foundations. Use each product docs site for app-specific implementation details.

**[B3OS Docs](https://docs.b3os.org)**

Workflows, actions, triggers, connectors, wallets, organizations, recipes, API routes, and Caddie.
  **[Protocol](/protocol/scaling)**

Chain setup, appchains, liquidity, tokenomics, staking, governance, and network operations.
  **[SDKs](/sdk/introduction)**

Global Accounts, CreateKit, BondKit, Game SDKs, auth, permissions, examples, and shortcuts.
  **[Data APIs](/data/api-reference)**

Indexed blockchain data and profile APIs with generated OpenAPI references.

## Product Docs

**[B3OS](https://docs.b3os.org)**

Build, run, and operate Caddie-assisted crypto-native workflows.
  **[AnySpend](https://docs.anyspend.com)**

Payments, checkout, cross-chain routing, x402, Order API, and Platform API.
  **[Basement](https://docs.basement.fun)**

Game developer launch guides and player support for accounts, wallets, rewards, and staking.

**[HypeDuel](https://docs.hypeduel.com)**

AI battle gameplay, betting mechanics, HYPES, ArenaCoins, and developer notes.
  **[Upside.win](https://docs.upside.win)**

Iframe game integration, frontend SDK setup, backend payout flow, and testing examples.
  **[All product docs](/products)**

See the full product docs directory and the split between B3 foundations and product-specific docs.