When you take a Bitcoin loan through Coinbase, it feels like borrowing from Coinbase. Under the hood, you are borrowing from a decentralized protocol called Morpho, with Coinbase acting as the friendly front door. Understanding that backend is the difference between thinking you have a Coinbase loan and knowing what you actually signed up for.
This is an independent explainer, not advice. Some details come from Morpho's documentation and reputable coverage; confirm specifics in the Coinbase app.
The short version
Coinbase does three things: it gives you the app, it converts your Bitcoin to Coinbase-wrapped Bitcoin (cbBTC) and custodies the underlying Bitcoin, and it routes you into a Morpho lending market on the Base network. Everything else, the lending, the rate, and the liquidation, happens on Morpho in smart contracts.
Who actually lends you the money
The USDC you borrow comes from other people. Lenders deposit USDC into a Morpho vault, and that capital funds your loan. The vault that funds Coinbase's market is curated by a third party, Steakhouse Financial, which selects the markets and sets risk parameters. Coinbase does not curate it and is not lending you its own balance sheet.
Who sets your rate
No human sets it. Morpho uses an algorithm called the AdaptiveCurveIRM that adjusts the rate based on how much of the available USDC is borrowed, targeting around 90 percent utilization. When borrowing demand is high, the rate drifts up; when it is low, it drifts down, and it updates roughly every block. That is the real reason your rate is variable with no ceiling: it is a market, not a posted price. For where fixed, centralized rates sit by contrast, see the BOB Bitcoin Loan Rate Index.
What it means for your risk
Routing through Morpho changes the risk picture in both directions:
- You remove single-company lending risk. You are not depending on Coinbase to stay solvent as a lender; the loan lives in audited smart contracts you can inspect on the Base block explorer.
- You add smart-contract and oracle risk. A bug or a manipulated price feed can cause losses no support desk will reverse.
- You still trust Coinbase's custody. cbBTC is backed by Bitcoin that Coinbase holds, so the custody question does not disappear, it moves.
This is the heart of why a Coinbase loan is really a DeFi loan. For the full picture, read our CeFi vs DeFi Bitcoin loans guide and our Coinbase loan review. If you would rather borrow from a company with fixed terms and a support line, compare the centralized options in our main comparison.