Borrow Against Bitcoin: How to Compare Loans Before You Commit

Borrowing against Bitcoin means posting your BTC as collateral and receiving cash or stablecoins, so you get liquidity without selling. The short answer: it can make sense when you need funds and want to keep your position, but the decision turns on custody, cost, and liquidation terms, not on the advertised rate alone. A lender comparison is a starting point for questions, not a decision by itself.

Start with who holds your collateral

Before any rate matters, ask where your Bitcoin sits during the loan. The 21Rates lender comparison describes two models. Custodial lending means a third party or the lender itself holds your collateral for the life of the loan. Non-custodial lending uses multisig or marketplace escrow, where no single party controls the collateral. (21Rates lender comparison, read 2026-10-26)

Neither model is universally correct. Custodial loans concentrate trust in one company, so you carry its solvency and operational risk. Non-custodial structures spread key control, but they do not remove counterparty, liquidation, regulatory, or operational risk. They change who you trust and how, not whether you trust anyone. The right choice depends on whether you prioritize direct key control, counterparty risk reduction, or operational simplicity.

Understand the interest structure, not just the number

Rates are quoted in different ways, and the structure changes your total cost. Strike's support documentation is a useful illustration of the two common forms. Strike defines APR as the total cost of borrowing expressed as a percentage of principal, and says its listed products carry no origination, early repayment, late payment, or liquidation fees. (Strike support, read 2026-10-26)

Strike also describes two rate behaviors. A term loan's APR remains fixed until the borrower refinances, consolidates, or closes it. A line of credit carries a variable APR calculated as the U.S. Prime Rate plus a fixed margin, and it may be recalculated quarterly. These are Strike-specific terms, not category-wide rules. Other lenders structure rates differently, so confirm each provider's own documentation.

The practical takeaway: ask every lender whether the rate is fixed or variable, what index a variable rate follows, how often it resets, and which fees sit outside the headline APR.

The five checks before you treat a comparison as a decision

For current market context, the 21Rates comparison lists 21 Bitcoin lenders, 13 custodial and 8 non-custodial, with a reported rate range of 0.0% to 17.2%, labeled as of October 23, 2026. Treat those figures as a dated snapshot. Rates, LTVs, and terms change, so verify each lender's current terms before committing.

What the risks actually look like

The core risk is liquidation. If Bitcoin's price falls and your LTV crosses the lender's threshold, the lender can sell your collateral. That converts a temporary drawdown into a permanent loss of your position, and it can happen faster than you can react if the terms allow no cure period.

Beyond that, you carry counterparty risk in custodial models, rate-reset risk on variable products, and the possibility that a lender changes terms or exits the market. Borrowing against Bitcoin is not risk-free, and it is not suitable for every holder. If you could not comfortably post more collateral or repay during a sharp drawdown, a smaller loan or no loan is the honest answer.

What to do next

1. Decide your custody preference first: custodial, non-custodial, or open to both.
2. Shortlist two or three lenders from a dated comparison like the 21Rates lender page.
3. Pull each lender's current documentation on APR structure, LTV, liquidation mechanics, minimums, and fees.
4. Stress-test the loan: at what price does liquidation trigger, and can you add collateral or repay before it does?
5. Borrow only what you can service under that stress case.

That sequence keeps the comparison in its proper place: a map of who exists, not a verdict on who is right for you.

Frequently asked questions

Can I borrow against Bitcoin without selling it?

Yes. A Bitcoin-backed loan uses your BTC as collateral and pays out cash or stablecoins, so you keep your position while accessing liquidity. The trade-off is that the lender can liquidate your collateral if its value falls below the loan's threshold.

What is the difference between custodial and non-custodial Bitcoin loans?

In a custodial loan, the lender or a third party holds your collateral during the loan. In a non-custodial loan, multisig or escrow means no single party controls the collateral. Non-custodial structures change who you trust, but they do not remove counterparty or liquidation risk.

Is a fixed or variable APR better for a Bitcoin loan?

It depends on how long you plan to borrow and your tolerance for rate changes. Strike, for example, says its term loan APR stays fixed until you refinance, consolidate, or close, while its line of credit is variable at U.S. Prime Rate plus a margin and may reset quarterly. Confirm each lender's own structure before comparing headline rates.

What happens if Bitcoin's price drops while I have a loan?

Your loan-to-value ratio rises as collateral value falls. If it crosses the lender's liquidation threshold, the lender can sell your Bitcoin to cover the loan. Check each lender's margin call and cure period terms, because those define how much time you have to add collateral or repay.

How do I compare Bitcoin lenders without missing hidden costs?

Compare the full account structure, not just the advertised rate: custody model, fixed versus variable APR, LTV limit, liquidation terms, minimum loan size, and every fee outside the APR. Use a dated comparison like the 21Rates lender page as a starting point, then verify current terms with each lender directly.

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