> For the complete documentation index, see [llms.txt](https://docs.ethosis.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ethosis.org/assets/usdg.md).

# USDG, the loan currency

Every Ethosis loan is denominated in **USDG**, the Paxos Global Dollar. That covers the principal, the interest, the fees and whatever a liquidation auction raises.

## The case for USDG

| Consideration                         | What it means for Ethosis                                                                                                                      |
| ------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| Issued natively                       | USDG is minted directly on Robinhood Chain, not bridged in, so no bridge sits in the settlement path.                                          |
| Already used for lending on the chain | The chain's first lending product, Robinhood Earn, runs on USDG through Morpho. The liquidity and integrations are therefore already in place. |
| Regulatory status                     | USDG is regulated under MiCA in the EU. For a protocol whose main market is the EEA that matters.                                              |
| Works with idle capital               | The whitelisted Morpho vault used for [idle capital](/protocol/idle-capital.md) holds USDG.                                                    |

## Other loan currencies

Because `loanToken` forms part of the market key, introducing a second loan currency means configuring a fresh, isolated market; existing loans are untouched. Two candidates exist:

* **USDe**, which is already on Robinhood Chain.
* **USDC over CCTP**, once there is confirmed bridged liquidity on the chain.

Three conditions have to hold before any new loan currency is added: bridged liquidity has been confirmed, the token's pause and blacklist behaviour has been reviewed, and an idle-capital vault for it exists. As with every other parameter, the addition passes through the timelock.

## Units and rounding

USDG has 6 decimals; Stock Tokens have 18. `PriceGate` returns a price expressed in loan-token base units per whole collateral token, and `LoanDesk` values collateral as `amount × price / 10^collateralDecimals`. LTV and interest calculations therefore stay in loan-token units throughout. The invariant suite verifies this arithmetic.


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