Moving a Loan to a Lower-Rate Blockchain

A borrower can move a crypto loan to a lower-rate chain by repaying the old debt and opening a new one, after checking that the savings exceed the full cost of the move. A lower advertised rate is only one part of that calculation. The transfer can also change which assets you can borrow against and how quickly your position can become unsafe.

How do you compare borrowing rates across chains?

Start with the same loan amount and time period on both chains. Check whether each displayed rate is fixed or variable, and whether it is an annual percentage rate (APR), which estimates a year’s borrowing cost without necessarily including every fee. Rates on lending markets can move as deposits and borrowing demand change.

Then estimate what you would pay to close the current loan and open the replacement. Include the costs that apply to your route and position:

• Interest due before you repay the existing loan.
• Swap fees and any price impact when exchanging tokens.
• Bridge fees and network transaction fees.
• Costs of changing, supplying or withdrawing collateral.

Compare those costs with the interest saved over the period you expect to keep the loan. If the new rate is variable, use more than one rate assumption; a small rate gap can disappear if borrowing demand rises. A guide to choosing a cross-chain swap by cost and speed covers a related part of the decision: how the route and token exchange affect the amount that arrives. The best route is the one that delivers enough usable funds at a reasonable total cost, not simply the one with the lowest quoted fee.

What has to happen when you move the loan?

A loan generally does not travel between chains as one intact position. You arrange funds on the destination chain, repay the original debt, and set up a new loan there. Depending on your assets and the services available, this may involve bridging tokens directly or swapping them before or after the transfer.

Plan the order before starting. You may need to supply collateral and borrow on the new chain before you can repay the old loan, but that can briefly leave you with debt in both places. Alternatively, repaying first can leave you without a loan while the transfer is pending. The right sequence depends on the available funds, route and loan terms.

Check that the asset you plan to use as collateral is supported on the destination market, and confirm that you are using the intended version of the token. A token with the same ticker can exist in wrapped or bridged forms, and a market may accept only particular versions. Also compare how much you can borrow against the asset: different markets can set different collateral limits.

How do you keep the new loan in a safer position?

Before borrowing, check the new loan’s liquidation threshold. Liquidation is when a market sells some collateral to cover a loan that has become too risky. The threshold depends on the market and collateral, so do not assume the old loan’s settings will carry over.

Borrowing the maximum available amount leaves less room for a drop in collateral value. If prices fall or the new market changes its parameters, you may need to add collateral or repay part of the debt. Consider borrowing less than the limit if you can; that gives the position more room to absorb price moves.

Finally, verify the network, token and destination address before signing each transaction. Read the transaction details, check how much collateral and debt the new position will show, and keep enough of the chain’s transaction token to pay network fees. If a transfer is delayed, the old loan’s interest may continue to accrue, so include that time in your cost estimate.

Moving makes sense when the expected interest savings are greater than the transfer costs and the new position’s terms work for you. Compare the full cost, plan how the old debt will be repaid, and leave room for rates and collateral values to change. A lower quote can be useful, but only if the loan remains workable after the move.