Cardano DeFi Lending & Borrowing

Supply assets to earn yield or borrow against collateral via Surf Finance.

Capabilities

• Browse lending pools with APY, APR, LTV, and available liquidity
• Supply assets to earn APY
• Borrow against collateral at known APR
• Compare pools by returns and risk

Providers

Provider	Supply	Borrow	API Key Required
Surf Finance	Yes (earn APY)	Yes (post collateral)	No
FluidTokens	No	Yes (NFT collateral)	Yes (FLUID_PARTNER_KEY)

Scripts

List Lending Pools

node scripts/list-pools.js [--sort supplyApy|borrowAprPct|available]

Supply (Deposit)

node scripts/supply.js --address <bech32> --pool <poolId> --amount <lovelace>

Borrow

node scripts/borrow.js --address <bech32> --pool <poolId> --amount <lovelace> --collateral <lovelace>

Key Concepts

• Supply APY: Annual yield earned by depositing into lending pools
• Borrow APR: Annual interest rate paid on borrowed funds
• Max LTV: Maximum loan-to-value ratio (e.g. 75% means borrow up to 75% of collateral value)
• Term Hours: Some pools have fixed-term loans; null = flexible
• Amounts in smallest units (lovelace for ADA pools)
• Surf API returns unsigned CBOR directly — sign and submit via operator

Safety Rules

• Always show pool APY/APR and LTV before committing
• Warn about liquidation risk if LTV is close to max
• Show effective borrow cost (APR + any fees)
• Require explicit confirmation before supply or borrow