Foundation is modular by design, consisting of two primary layers working in unison.
Base Layer
USD' (USD Prime)
Backed by fiat stablecoins and RWAs. The shared liquidity layer.
Strategy Layer
PrimeUSD, ApolloUSD, OrdUSD
Yield strategies built on top of USD'.
USD' is the stable base asset of the Foundation ecosystem—the shared liquidity layer that all strategies are built upon.
Backing
Fiat stablecoins (USDC, USDT) and RWA tokens
Peg
Soft-pegged 1:1 to the US Dollar
Function
Shared liquidity layer for all strategy swaps
Standard
ERC20-compatible
When you move capital from one strategy to another, USD' is the internal settlement layer that enables instant swaps—without requiring external DEX trades or waiting for settlement.
The Core Accounting Engine
The Vault is the immutable ledger that holds all collateral backing USD' and maintains the master map of solvency.
Collateral Custody
Holds USDC, USDT, and RWA tokens that back USD'
Asset Isolation
Strategy contracts cannot access collateral directly
Virtual Settlement
Strategy swaps are ledger updates—no costly token transfers
Real-Time Solvency
Maintains global Asset ↔ Liability mapping at all times
Fiat Stablecoins: USDC, USDT, FRAX
RWA Tokens: Tokenized T-Bills, private credit
Strategy dollars like PrimeUSD, ApolloUSD, and OrdUSD are built on top of USD' as standardized ERC4626 Tokenized Vaults.
Deposit: Users deposit USD' to mint strategy shares
Deploy: The strategy deploys capital to external yield venues (Aave, Orderly, Acred)
Yield: Profits flow back and increase share value
Withdraw: Burn shares to receive USD' plus accrued yield
The ERC4626 standard ensures:
Composability — Strategies work across all DeFi protocols
Standardization — Consistent interface for deposits, withdrawals, and share accounting
Transparency — Share prices and total assets are always queryable on-chain
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