What Is Bitcoin DeFi (BTCfi)? How It Works in 2026

Bitcoin DeFi, often shortened to BTCfi, means using BTC in decentralized finance: lending it, borrowing against it, trading it in liquidity pools or earning a yield on it, all through smart contracts instead of a company. Bitcoin's own chain can't run those contracts, so almost all BTCfi happens on other chains with a token that represents BTC, or through protocols such as Babylon that use Bitcoin's scripting to lock coins in place.

This guide explains how BTCfi works, the main ways it is used in 2026, and the risks that come with each. Figures are from DefiLlama and protocol APIs on 2 November 2026.

How Bitcoin gets into DeFi

Bitcoin's scripting language can lock coins and require signatures, but it can't run a lending market or an exchange. So BTCfi moves BTC, or a claim on it, to a chain that can. There are three ways to do that, and the one a product uses decides most of its risk.

• Custodial wrapping. A company holds real BTC and issues a token against it. WBTC, cbBTC (Coinbase) and xBTC (OKX) work this way. You trust the custodian to hold the coins and redeem them. See what wrapped Bitcoin is.
• Bridges and threshold signing. A bridge or a group of signers locks BTC and mints a token on another chain. zwBTC on Sui is a LayerZero token for WBTC. Hashi, rolling out on Sui since October 2026, has Sui validators manage deposits with threshold cryptography and mints hBTC (see our Hashi explainer). You trust the bridge's security model.
• Staying on Bitcoin. Babylon locks BTC in a timelock script on Bitcoin and lets proof-of-stake chains use it as security. The coins never move, but they can't be used in other DeFi apps unless you take a liquid staking token such as LBTC on top.

What people do with Bitcoin in DeFi

Borrow against BTC without selling it

The biggest use by far. On 2 November 2026 Aave v3 on Ethereum held $2.56B of WBTC and Morpho on Base held $3.13B of cbBTC, most of it posted as collateral to borrow stablecoins. Borrowing USDC on Aave cost about 4.7% a year. It lets holders raise cash without a taxable sale in many countries, but a sharp BTC drop can liquidate the position. Read how the health factor works before you borrow.

Lend BTC for interest

Supplying BTC to the same markets pays little, because few people want to borrow BTC itself. Aave's WBTC market paid 0.00% to suppliers on 2 November. The exceptions are markets with incentives: NAVI on Sui paid 3.23% on zwBTC, all of it in its CERT reward. Current rates for both sides are in Bitcoin lending rates.

Stake BTC through Babylon

Babylon held $3.17B of BTC on 2 November, the largest single BTCfi protocol by TVL. Stakers are paid in BABY. We cover it in can you stake Bitcoin.

Provide liquidity

Pools that pair BTC with a stablecoin earn trading fees but lose value against holding when BTC moves. Pools that pair two BTC wrappers, such as xBTC and zwBTC, barely move against each other and often carry token rewards. The risk shifts to the wrappers: if one fails, the pool ends up holding the failed one.

Loop for a higher yield

When a market pays incentives on BTC deposits and the BTC debt is cheap, you can supply, borrow, and supply again. jBTC, our vault on Sui, automates this: it supplies zwBTC on NAVI, borrows xBTC at about 0.08%, swaps it to zwBTC on Bluefin and supplies that too, up to about 2x. At 2 November rates it projected about 5.0% a year in BTC after fees, against 3.2% for supplying zwBTC alone. It is in beta with a 2.5 BTC cap, and most of the yield is NAVI's CERT incentive, which NAVI can end. Not financial advice.

Where BTCfi runs

For the Sui lenders in detail, see NAVI vs Suilend vs Scallop.

The risks

• Wrapper risk. The token you hold is only as good as its custodian or bridge. Different wrappers can trade at different prices under stress.
• Smart-contract risk. Every protocol in the chain of a strategy can fail.
• Liquidation. Borrowing against BTC means a fast drop can sell your collateral.
• Incentive risk. Many BTC yields are token rewards. Value them at zero and see what is left.
• Oracle risk. Some markets price several BTC wrappers from one BTC/USD feed, so they won't react if one wrapper depegs. Strategies that hold one wrapper and owe another need their own check, which is why jBTC watches the Bluefin xBTC/zwBTC price.

Is Bitcoin DeFi worth it?

It depends on what you want from your BTC. Borrowing against it is mature and deep. Earning on it is thinner: base lending rates are near zero, so most yield above 1% comes from staking rewards paid in other tokens or from incentives that can end. Start with the wrapper, then the source of the yield, then the rate. The best ways to earn yield on Bitcoin ranks the main options.

Figures as of 2 November 2026 and variable. Not financial advice.