Money Protocol is the opposite shape: you keep custody, you deposit Bitcoin into a smart contract on Rootstock, and you mint a USD-pegged stablecoin (BPD) against it. There is no interest, no fixed term, no admin key, and no team that can pause your vault. You repay whenever you want and walk away with your Bitcoin.

Here's what's actually happening under the hood, and why "0% interest" isn't a marketing trick.

The two shapes of borrowing

Most lending protocols charge interest because they're rented liquidity. Someone supplies USDC to a pool, you borrow it, and you pay the supplier (plus the protocol) a recurring rate. The rate is whatever the market sets — sometimes 3%, sometimes 25%. Pay or get liquidated. Roll over forever.

Overcollateralized minting is a different shape. You're not borrowing someone else's money. You're locking collateral and the protocol mints fresh stablecoins against it. No supplier to pay. No rate to float. The fee is a one-time charge baked into the BPD you receive, and after that you owe a fixed amount of BPD. Forever. No interest.

This is the Liquity model, adapted for Bitcoin via Rootstock. Money Protocol uses RBTC (1:1-backed Bitcoin on the Rootstock sidechain) as the collateral.

The five-step flow

1. Connect a self-custodial wallet (MetaMask works) configured for Rootstock mainnet.

2. Get RBTC — bridge BTC via PowPeg, or buy on a Rootstock-supporting exchange.

3. Open a vault at bitcoinstable.money. Deposit RBTC as collateral. Choose how much BPD to mint, subject to the 110% minimum collateral ratio.

4. Use the BPD. Spend it. Swap it on a Rootstock DEX. Hold it. Or deposit it into the stability pool to earn liquidation rewards.

5. Repay whenever. Return the BPD and reclaim your full RBTC collateral. There is no fixed term and no rollover risk.

Full walkthrough on the /borrow page at moneyprotocol.co/borrow.

Where the 0% holds up

The fairest pushback on "0% interest" is: nothing is free, what's the catch?

There is no catch. There is a one-time borrowing fee built into the minted BPD — small, transparent, paid upfront. After that, your debt sits at whatever you minted, indefinitely. No accruing rate. No surprise compounding. You only owe more if you choose to borrow more.

The economics work because Money Protocol isn't paying lenders. It's a closed monetary loop: BPD is created against locked collateral, redeemed against locked collateral, and burned when repaid. The system doesn't need a yield curve.

The trade-offs are real, but they're the trade-offs of any overcollateralized system. You can't borrow more than ~91% of your collateral value (the 110% CR is a hard floor). If RBTC drops sharply, undercollateralized vaults get liquidated by the stability pool. You absorb price risk, not counterparty risk.

What about counterparty risk in the protocol itself?

This is the second-most-asked question.

The protocol has no admin key. No team multisig that can pause vaults, freeze BPD, or seize collateral. No upgradeable contracts that can be redirected. The same code that ran on day one runs today. Liquidations are rule-based and triggered by anyone — the protocol pays a small gas-and-incentive premium to the liquidator.

This isn't an unusual setup in DeFi, but it is unusual against the alternatives most Bitcoin holders have used. There is no SBF-equivalent to fail here. The smart contracts can have bugs (that's why audits exist — ours is in the docs at docs.moneyprotocol.co), but there is no human discretion to abuse.

Who this is actually for

Three rough profiles.

• The holder who wants liquidity without selling. You think Bitcoin keeps appreciating. You don't want to lock in a taxable event. You need dollars. Mint BPD against a slice of your BTC, use the dollars, repay later, keep your sats.

• The holder who got burned by CeFi. You used Celsius or BlockFi for the same reason — passive yield, easy dollar liquidity — and lost it. You won't trust a custodian again. Money Protocol gives you the same primitive without anyone to trust.

• The stablecoin user who prefers non-custodial dollars. You hold USDC because dollars are useful, but you don't love Circle's freeze list, its banking exposure, or its regulatory surface area. BPD is backed by Bitcoin, not bank deposits.

What this blog will cover

Most posts here will be: how the protocol works, how to use specific features, the broader BitcoinFi landscape, and the case for non-custodial dollars backed by Bitcoin. Some posts will be opinionated. All of them will be honest about trade-offs.

If you want to start: open a vault at bitcoinstable.money, read the docs at docs.moneyprotocol.co, or walk through the borrow flow at moneyprotocol.co/borrow.