---

title: [ARFC] Core & Base - BTC Correlated Asset Update author: @TokenLogic created: 2025-02-04

---

Summary

This proposal focuses curating LBTC for growth across Core and Base instances of Aave v3. Several initiatives are included:

• Onboard LBTC on Base;
• Create LBTC/cbBTC eMode on Core instance;
• Create LBTC/fBTC eMode on Core instance;
• • Create LBTC/tBTC eMode on Core instance;
• Create LBTC/cbBTC eMode on Base instance; and;
• Amend cbBTC Borrow Rate.

Motivation

Lombard has demonstrated consistent growth, surpassing $1.8B in TVL, and has established itself as the leading BTC LST in the market. Its initial onboarding, coupled with the first liquid eMode alongside WBTC, quickly reached supply caps, highlighting strong demand for leverage loops between LBTC and BTC wrappers.

On Aave’s Core instance, cbBTC is the second-largest BTC wrapper. While it experienced strong growth post-listing, the absence of borrowing opportunities has limited its potential. The onboarding of LBTC introduces a new growth avenue for both LBTC, cbBTC, tBTC and fBTC. The new liquid eModes will allow users to loop LBTC exposure while offering attractive deposit rates for cbBTC and fBTC holders, incentivizing them to supply liquidity and fuelling this strategy.

Specifically to fBTC, a points program will be applied to users who deposit fBTC and also, to different users who borrow fBTC. Leveraging LBTC/fBTC is expected to stimulate demand for fBTC.

To support this growth strategy, the optimal utilization rate (Uoptimal) for cbBTC and fBTC should be increased from 45% to 80%, aligning them with wBTC. The initial Uoptimal was set when cbBTC had minimal borrowing demand, but the introduction of this liquid eMode is expected to significantly boost cbBTC borrowing activity, warranting this adjustment. For fBTC, not yet listed, the opportunity between Lombard and Ignition developed relatively recently.

Additionally, Base has emerged as the second-largest platform for cbBTC growth. Onboarding LBTC to Base will replicate this successful dynamic, with LBTC users leveraging existing cbBTC liquidity. For Lombard, Base is already the third-largest ecosystem (after Mainnet and Berachain), with over $117M in TVL, making it an ideal environment to extend this growth strategy.

Specification

Updated to include feedback from Risk Service Providers.

Core Instance

Amend cbBTC Borrow rate Uoptimal

Description	Current	Proposed	Change
Borrow Rate Uoptimal	45%	80%	+35%
Slope2	300%	60%	-240%
Reserve Factor	20%	50%	+30%

Amend Proposed fBTC Borrow rate Uoptimal

Description	Current	Proposed	Change
Borrow Rate Uoptimal	45%	80%	+35%
Slope2	300%	60%	-240%

Amend Proposed tBTC Borrow rate Uoptimal

Description	Current	Proposed	Change
Borrow Rate Uoptimal	45%	80%	+35%
Slope2	300%	60%	-240%
Reserve Factor	20%	50%	+30%

Liquid E-modes

Parameters	Value	Value
Asset	LBTC	wBTC
Collateral	Yes	No
Borrowable	No	Yes
Max LTV	84%	-
Liquidation Threshold	86%	-
Liquidation Bonus	3.00%	-

Parameters	Value	Value
Asset	LBTC	cbBTC
Collateral	Yes	No
Borrowable	No	Yes
Max LTV	84%	-
Liquidation Threshold	86%	-
Liquidation Bonus	3.00%	-

Parameters	Value	Value
Asset	LBTC	tBTC
Collateral	Yes	No
Borrowable	No	Yes
Max LTV	84%	-
Liquidation Threshold	86%	-
Liquidation Bonus	3.00%	-

Parameters	Value	Value
Asset	LBTC	fBTC
Collateral	Yes	No
Borrowable	No	Yes
Max LTV	84%	-
Liquidation Threshold	86%	-
Liquidation Bonus	3.00%	-

Note: This ARFC assumes fBTC has already been listed on Aave by the time the Snapshot vote has finished. If not, the proposed changes shall feature in the AIP that onboards fBTC to Aave Core instance

Base Instance

Onboarding of LBTC

Parameters	Value
Network	Base
Isolation mode	No
Borrowable	No
Collateral enabled	Yes
Supply Cap	400
Borrow Cap	-
Debt Ceiling	-
LTV	68%
LT	73%
Liquidation Bonus	8.5%
Liquidation Protocol Fee	10%
Variable Base	-
Variable Slope1	-
Variable Slope2	-
Uoptimal	-
Reserve Factor	-
Stable Borrowing	Disabled
Flashloanable	Yes
Siloed Borrowing	No
Borrowed in Isolation	No

Liquid E-modes

Parameters	Value	Value
Asset	LBTC	cbBTC
Collateral	Yes	No
Borrowable	No	Yes
Max LTV	82%	-
Liquidation Threshold	84%	-
Liquidation Bonus	3.00%	-

Amend cbBTC Borrow rate Uoptimal

Description	Current	Proposed	Change
Borrow Rate Uoptimal	45%	80%	+35%
Slope2	300%	60%	-240%
Reserve Factor	20%	50%	+30%

Disclosure

TokenLogic does not receive any payment for this proposal.

Next Steps

1. Gather feedback from the community.
2. If consensus is reached on this ARFC, escalate this proposal to the Snapshot stage.
3. If Snapshot outcome is YAE, escalate this proposal to the AIP stage.

Copyright

Copyright and related rights waived via CC0.