LIEN
XGITHUB

Solana lending hooks · open source · Apache-2.0

Tie your loans.

Lien is a hook runtime for Marginfi v2, Kamino Lend, and Solend. Compose a knot of lifecycle handlers, install it on a pool, and let the on-chain executor enforce it on every deposit, borrow, repay, and liquidation.

Tie a knotRead the spec →
  • 6 / 6 hooks
  • 47 / 47 tests
  • Marginfi + Kamino + Solend
  • Anchor 0.31
  • Solana mainnet
Workshop / bench 01
riggers · est. 2026

Problem

Lending dApps already work. They just can't be told how to work.

Every operator wants their own rules. None of them want their own lending protocol. Today they have to pick one.

  • −18.4%

    Avoidable liquidation

    Marginfi, Kamino, and Solend treat LTV as static. When SOL whipsaws, healthy positions get reaped in the same block as broken ones. Operators have no way to tighten thresholds in real time.

  • $5.8M

    MEV captured per quarter

    Liquidation rewards on Solana are first-come-first-served. Searchers consistently frontrun the operator-aligned liquidators that fund recovery on bad debt.

  • 0 / 3

    Pools with KYC isolation

    Institutional credit needs allowlisted borrowers. Today the only path is to fork the lending program — which forks the audit, the bug bounty, and the integrations too.

  • manual

    Risk-off cycle response

    Hedging a collateral basket against a drawdown means writing one-off bots. Each pool builds the same plumbing again from scratch.

Solution

One knot, many lifecycle points.

The hook runtime sits between the lending program and the user. It doesn't fork the protocol — it ties onto it.

  1. 01

    Event

    Marginfi, Kamino, or Solend CPI-calls the executor at any of eight lifecycle points.

  2. 02

    Composition

    The pool's installed knot — up to eight hooks in priority order — runs against the event.

  3. 03

    Decision

    Each hook returns Accept, Accept-with-side-effect, or Reject. Side-effects accumulate; a single Reject halts the lifecycle.

  4. 04

    Apply

    The adapter consumes the side-effects: override max LTV, override rate, delay liquidation, emit a Drift short, etc.

Library

Six standard knots. Eight slots per pool.

Every operator starts here. Publish your own to the marketplace, or stick with the canon — every standard hook is audited and Apache-2.0 licensed.

Backtests

What the workshop produced last quarter.

Replays against archive node data, executed inside the Lien simulator with the same decision tree the on-chain executor would run.

  • SOL-USDC (Marginfi)

    DynamicLTV + AntiMEVLiq

    Mar 1 — Apr 1, 2026

    • Liquidations vs baseline−31%
    • MEV captured by ops keepers+$182k
    • Max LTV at peak vol55%

  • JitoSOL-mSOL (Kamino)

    DynamicLTV + AutoHedge

    Feb 14 — Mar 14, 2026

    • Realised drawdown−18%
    • Hedge fills via Drift412
    • Operator net rate APY9.8%

  • USDC institutional (Solend)

    WhitelistBorrow + ReputationRate

    Q1 2026

    • Borrower default rate0.0%
    • Average APR delta−2.4%
    • Approved borrowers84

Token

$LIEN sits behind every knot.

The token bonds builders, operators, and keepers to the same workshop. Fees flow in. Stake flows out. Reputation accrues on-chain.

CA published at launch.

  • Execution fee · 50% buyback-burn

    Every hook the executor runs charges a per-call fee. Half routes to a Jupiter buyback and burn of $LIEN.

  • Premium hook templates

    Advanced AntiMEV, KYC, and AutoHedge templates are stakable — they unlock when an operator parks $LIEN against the pool.

  • Publisher revenue share

    Hook publishers earn a share of subscription fees in $LIEN. Authors set their own terms in the marketplace listing.

  • Keeper rewards

    Liquidation rewards routed through AntiMEVLiq compose with $LIEN emissions for registered keepers.

Start tying

Pick a knot. Install it on a pool. Watch the executor pull the rope.

The designer is browser-only. The executor is on Solana mainnet. The CLI and the VS Code extension are npm i -g lien-cli away.

Open the designerRead source →