Save

Save is an algorithmic, decentralized lending and borrowing protocol on Solana. Users deposit supported tokens to earn interest or post collateral to take out overcollateralized loans — all without fixed repayment deadlines or a centralized counterparty.

Background

Save launched on Solana mainnet in late 2021 under the name Solend, positioning itself as the chain's first major money market. It quickly attracted hundreds of millions of dollars in deposits and became a foundational piece of Solana DeFi infrastructure. In 2024, the project rebranded from Solend to Save to reflect a broadened product vision that extends beyond borrowing and lending into staking and stablecoin issuance. The core smart contract program address — So1endDq2YkqhipRh3WViPa8hdiSpxWy6z3Z6tMCpAo — remains unchanged and has operated continuously since launch.

How It Works

Save follows a utilization-based interest rate model analogous to Aave's. Each pool has a target utilization rate. When actual utilization is below that threshold, rates are low to encourage borrowing. When utilization climbs above it, rates rise steeply to incentivize repayment and attract new liquidity. This means rates adjust continuously and algorithmically without manual governance votes.

User positions are tracked via two on-chain primitives:

• cTokens (collateral tokens): issued to depositors representing their share of a pool. cTokens appreciate in value as interest accrues, so redeeming them returns principal plus earned interest.
• Obligations: on-chain records capturing each wallet's aggregate borrows and supplied collateral across pools. The protocol computes each obligation's health factor in real time.

Liquidation is permissionless. If a borrow position's collateral value falls toward the loan threshold — due to price movement or interest accrual — any external actor can repay part of the debt and receive the corresponding collateral plus a liquidation bonus. No centralized keeper is required.

Pool Architecture and Risk Isolation

Save uses a three-tier pool structure to contain risk:

Main Pool — hosts established, liquid assets (SOL, USDC, USDT, ETH, BTC, major LSTs). Assets here meet stricter oracle and liquidity standards. A failure in a smaller pool cannot drain the main pool.

Isolated Pools — newer or more volatile tokens that are not yet eligible for the main pool. Borrow limits and loan-to-value ratios are tighter. If an isolated pool suffers an oracle manipulation or bad debt event, the exposure is contained to that pool.

Permissionless Pools — anyone can create a pool for any token with custom parameters. This makes Save the venue for long-tail assets that larger lenders like Kamino or MarginFi decline to list. Risk here is user-defined and explicit.

The isolation architecture is one of Save's most operationally significant features. Several DeFi protocols have suffered protocol-wide insolvency from a single bad listing or oracle exploit; Save's tiered design limits blast radius by design.

Key Products

Lending and Borrowing — the core product. Depositors earn Supply APY; borrowers pay Borrow APY, both of which update continuously with utilization.

saveSOL — a liquid staking token. Users deposit SOL and receive saveSOL, which accrues staking rewards while remaining usable as collateral or transferable within DeFi. This competes with other LSTs like mSOL and JitoSOL while keeping yield within the Save ecosystem.

sUSD — a native stablecoin introduced alongside the rebrand. Details are tied to the protocol's collateral mechanics but represent Save's expansion into the CDP (collateralized debt position) stablecoin space.

Turbo Pool and JLP Pool — specialized pools supporting Jupiter LP tokens and leveraged strategies, broadening the protocol's addressable use cases beyond vanilla lending.

SAVE Token — governance token, converted from the original SLND token during the rebrand. SAVE holders can participate in protocol governance votes. Former SLND holders also received mSEND tokens convertible to SEND on the Sui network, where the team launched a sister protocol, Suilend.

Security and Audits

Save's smart contracts have been audited by Kudelski Security, Neodyme, and OSEC — three firms with established records auditing Solana programs. The protocol maintains a bug bounty program offering up to $1 million for critical vulnerability disclosures. The main program has operated on mainnet since 2021 with continuous TVL in the hundreds of millions of dollars, providing an extensive live security track record.

Team

The team behind Save also developed Suilend, the leading lending protocol on the Sui blockchain, indicating continued active development and a multi-chain strategy. The project operates under the GitHub organization solendprotocol.

Ecosystem Position

Save occupies a specific niche in Solana's increasingly competitive lending landscape. As of late 2025, the protocol holds roughly $200–300 million in TVL — substantial but lower than the peaks reached in mid-2024 near $400 million. Newer entrants such as Kamino and Jupiter Lend have attracted significant inflows, and the RedStone Solana Lending Markets report (December 2025) notes that Save "has struggled to capture a meaningful share of recent growth" compared to these well-capitalized newer protocols. Save's response has been to lean into simplicity, reliability, and its long operational history, while expanding scope through saveSOL, sUSD, and the permissionless pool offering.

For users who need to borrow against assets that the larger protocols won't list, or who want a battle-tested protocol with years of mainnet history, Save remains a relevant and active option in Solana DeFi.