UMA — Announcing the Yield Dollar on renBTC

Clayton Roche
Sep 7, 2020 · 3 min read

With the launch of uUSDrBTC-OCT on UMA protocol it is now possible to leverage Bitcoin permissionlessly on the Ethereum network. You can mint renBTC from Bitcoin, then lock that renBTC into UMA. With this as collateral, you can mint uUSD, which can be used to purchase more renBTC and create a permissionless leveraged position.

Alternatively, you can farm by staking that uUSD you mint into the associated Balancer pool to yield farm three DeFi assets at once: $BAL, $REN, and $UMA.

uUSD Tokens

uUSD is a “yield dollar.” The yield dollar model is described here. The first iteration backed by ETH has resulted in over 10mm in minted yield dollars backed by ETH (yUSD). The name has been changed to “uUSD” both to avoid confusion with other products as well as to stake a claim on the u-prefix for UMA.

renBTC Collateral

renBTC was chosen in particular due to the fact that renBTC is the most popular and largest permissionless BTC-representing coin on the Ethereum blockchain. It is not being chosen at the exclusion of other possible BTC-representing coins in the future.

Permissionless Yield Farming with Bitcoin

Risk Labs and Ren will both offer farming rewards to users who contribute uUSDrBTC-OCT and USDC to the Balancer pool. The pool is whitelisted by Balancer, so farmers will receive all three assets: $REN, $UMA, and $BAL.

The pool will receive 10,000 UMA tokens per week, 25,000 REN tokens per week, and BAL tokens per Balancer’s calculations. Rewards are calculated every 256 blocks, so providing liquidity for even just a few hours will earn rewards. The APR depends on how much liquidity is provided over the entire week and is not possible to predict, only estimate. Each reward period is calculated and summed at 23:00 UTC every Monday. That week’s rewards will be airdropped approximately 24 hours after.

You can find the current APR for that moment by checking the yUSD Yield tab at It will run about 3 weeks and may possibly roll over into a new issuance.

Farming instructions

  1. Wrap your BTC into renBTC so that it is usable on the Ethereum blockchain. To mint renBTC from native Bitcoin, go to RenBridge. Or, you can purchase renBTC on an exchange.

Leverage Instructions

Follow steps 1–2 above, then use uUSD to purchase USDC in the balancer pool.

You can then swap your USDC for more renBTC, which will increase your exposure to the underlying asset of Bitcoin.


  • Be careful when adding only USDC to the balancer pool. This will auto-purchase uUSD, which could be trading at a premium in that moment and be a net loss for you.


Farming Guide
UMA’s Minting UI — Mint and manage your position
UMA Protocol calendar
Balancer Swap USDC <> uUSD
Balancer Add / Manage Liquidity

Appendix: UMA Token Details

  • ERC20 Short name: uUSDrBTC-OCT

UMA Project

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