Aave charges ~4.4% (variable) APR with $0 origination fees using smart contract (wrapped btc via custodial bridge). Surge Credit charges 6.9% variable / 9.9% fixed APR with $0 origination fees using collaborative multisig (taproot vault, 3-of-4 signer network). See the full breakdown of rates, thresholds, and custody risk below.
Rates verified 2026-06-09
Aave offers a lower headline rate at ~4.4% (variable) compared to Surge Credit's 6.9% variable / 9.9% fixed. On a $1M loan held for 12 months, Aave saves $55,000 in total first-year cost (interest plus origination fees).
Total year-1 cost includes both annualized interest and any origination fees charged upfront.
| Loan Size | Aave APR | Surge Credit APR | Aave Total Year-1 Cost | Surge Credit Total Year-1 Cost | Savings |
|---|---|---|---|---|---|
| $100,000 | 4.4% | 9.9% | $4,400 | $9,900 | $5,500 with Aave |
| $250,000 | 4.4% | 9.9% | $11,000 | $24,750 | $13,750 with Aave |
| $500,000 | 4.4% | 9.9% | $22,000 | $49,500 | $27,500 with Aave |
| $1M | 4.4% | 9.9% | $44,000 | $99,000 | $55,000 with Aave |
| $5M | 4.4% | 9.9% | $220,000 | $495,000 | $275,000 with Aave |
Total year-1 cost includes annualized interest plus origination fees. Aave rates are variable; the table uses a representative recent rate. Surge Credit rates are variable; the table uses a representative recent rate. Rates sourced from each lender's public rate pages as of 2026-06-09.
Both Aave and Surge Credit use similar custody approaches: smart contract (wrapped btc via custodial bridge) and collaborative multisig (taproot vault, 3-of-4 signer network) respectively. Aave holds collateral in audited smart contracts rather than with a single lender, but borrowing requires wrapped Bitcoin (WBTC or cbBTC) — your underlying BTC is held by the wrapper's custodian (BitGo/BiT Global for WBTC, Coinbase for cbBTC), reintroducing custodial bridge risk. Smart-contract and oracle risk also apply. Surge Credit uses Collaborative multisig (Taproot vault, 3-of-4 signer network). Multiple key holders must coordinate to move funds, reducing single-point-of-failure risk but still requiring trust in the key coordination process.
Aave has no margin-call mechanism: positions become liquidatable automatically the moment LTV crosses 78%, with no warning threshold or response window. Surge Credit has no margin-call mechanism: positions become liquidatable automatically the moment LTV crosses 90%, with no warning threshold or response window.
| Threshold | Aave | Surge Credit |
|---|---|---|
| Max Starting LTV | 73% | 50% |
| Margin Call | None | None |
| Margin Call Window | None — automated liquidation | None — automated liquidation |
| Liquidation | 78% LTV | 90% LTV |
Aave: 5.0 percentage point buffer between starting LTV (73%) and liquidation (78%). Surge Credit: 40.0 percentage point buffer between starting LTV (50%) and liquidation (90%). Surge Credit provides a wider safety margin.
Choosing between Aave and Surge Credit requires evaluating total cost, custody risk, and which platform aligns with your borrowing profile. Aave uses smart contract (wrapped btc via custodial bridge) with ~4.4% (variable) APR, while Surge Credit uses collaborative multisig (taproot vault, 3-of-4 signer network) with 6.9% variable / 9.9% fixed APR.
On a $250,000 loan, Aave costs $11,000 in the first year versus $24,750 at Surge Credit, a difference of $13,750. Aave charges no origination fee, so the only cost is interest.
Both platforms use similar custody approaches. Aave operates via smart contract (wrapped btc via custodial bridge), and Surge Credit uses collaborative multisig (taproot vault, 3-of-4 signer network). Neither platform rehypothecates borrower collateral.
Aave is the better fit for borrowers who need smaller loans or instant access. Surge Credit is the better fit for borrowers who need smaller loans or more flexible access.
Key details to be aware of: Aave: DeFi money market — rates are variable and utilization-driven: USDC borrow against WBTC/cbBTC has ranged ~3.5-5. Surge Credit: Revolving BTC-backed USDC credit line on Base — launched 2026, early-stage. Variable rate from 6.
Aave is cheaper. On a $500,000 loan held for 12 months, Aave costs $22,000 (4.4% APR) while Surge Credit costs $49,500 (9.9% APR). That is a $27,500 difference in the first year.
Aave uses smart contract (wrapped btc via custodial bridge). Surge Credit uses collaborative multisig (taproot vault, 3-of-4 signer network). Both platforms present similar custody risk profiles.
Aave has no minimum loan amount. Surge Credit has no minimum. Both have the same minimum.
Aave has no margin call — positions are liquidated automatically the moment LTV crosses 78%. Surge Credit has no margin call — positions are liquidated automatically the moment LTV crosses 90%. Starting from a 50% LTV, Aave provides a 28-point buffer before liquidation, while Surge Credit provides a 40-point buffer.
It depends on your priorities. Aave (~4.4% (variable) APR, smart contract (wrapped btc via custodial bridge), no minimum) is better for borrowers who value smart contract (wrapped btc via custodial bridge) and need smaller loan access. Surge Credit (6.9% variable / 9.9% fixed APR, collaborative multisig (taproot vault, 3-of-4 signer network), no minimum) is better for borrowers who value collaborative multisig (taproot vault, 3-of-4 signer network) and need smaller loan access. Use the rate table and cost comparison above to model your specific scenario.
Lygos offers 10% APR, $0 origination fees, and DLC-secured collateral where rehypothecation is cryptographically impossible.