Crypto Gloss

Alchemix

Alchemix is a DeFi protocol issuing self-repaying loans — users deposit yield-bearing assets (yvDAI, stETH) and borrow synthetic tokens (alUSD, alETH) at up to 50% LTV, with the underlying deposit generating yield that automatically repays the debt over time without any liquidation risk.

Overview

Launched in February 2021, Alchemix introduced one of DeFi’s most novel borrowing primitives: loans that repay themselves. By depositing yield-bearing collateral and borrowing against future yield, users access liquidity today (up to 50% of deposit value) while the collateral’s yield gradually repays the loan. Because borrowed value never exceeds 50% of deposit, and yield always flows to repayment, the position can never go below the threshold where liquidation would be needed. This “no liquidation” claim became Alchemix’s signature feature and drew significant attention from DeFi users wanting leverage without forced liquidation risk.

Self-Repaying Loan Mechanism

Here’s how this works in practice.

Deposit and Borrow

  1. User deposits yield-bearing assets (e.g., yvDAI — Yearn’s USDC vault token, or stETH)
  2. Protocol accepts the deposit and accrues yield on it via integrated protocols
  3. User borrows synthetic tokens (alUSD or alETH) up to 50% of deposit value
  4. Borrowed synthetic tokens are 1:1 soft-pegged to USD or ETH respectively
  5. The underlying deposit continues generating yield (Yearn vaults, Convex, Curve, Lido, etc.)
  6. Yield flows to debt repayment: debt shrinks automatically each epoch without any user action

Why No Liquidation

Since LTV is capped at 50%, and debt can only decrease over time (yield repays it), the collateral value can theoretically fall to 50% of initial value before the position becomes truly undercollateralized. However, even in that case Alchemix’s system accounts for the accrued but undelivered yield rather than immediately liquidating.

Synthetic Tokens

alUSD:

  • Soft peg to $1 USD
  • Backed by DAI, USDC, and similar stablecoins deposited as collateral
  • Yield from Yearn DAI vaults repays alUSD debt
  • alUSD circulates freely; used in Curve pools (alUSD/3pool or alUSD/FRAX), providing real market liquidity

alETH:

  • Soft peg to ETH
  • Backed by stETH/wstETH, yvETH, or similar ETH-denominated yield-bearing assets
  • Yield from staking or Yearn ETH vaults repays alETH debt

Transmuter

The Transmuter is Alchemix’s peg stability module:

  • Conversion mechanism — allows holders to convert alUSD to DAI (or alETH to ETH) at exactly 1:1 over time
  • Queue system — redemptions are processed as yield flows into the system; users queue and receive their conversion as protocol earns enough yield to back it
  • Floor support — the Transmuter prevents alUSD from trading significantly below $1, because arbitrageurs can always queue at 1:1 conversion (waiting for yield to fill)

ALCX Token

ALCX is Alchemix’s governance token:

  • Governance — ALCX holders vote on yield strategy changes, new collateral additions, and protocol parameters
  • Staking — staked ALCX earns a share of protocol fee revenue
  • Liquidity incentives — ALCX emissions historically distributed to alUSD/ETH liquidity providers on Curve and Sushiswap

Protocol Evolution (v2)

Alchemix v2 expanded the collateral types dramatically beyond the initial yvDAI + stETH:

  • Multiple vault types — Curve vault positions (3pool, FRAX, etc.), Aave deposits, Yearn vaults for many different yield-bearing assets
  • alAssets for new collateral — any whitelisted yield-bearing asset can have a corresponding alAsset minted against it
  • Multi-chain — v2 deployed on Optimism and Arbitrum in addition to Ethereum

History

  • February 2021 — Alchemix launches on Ethereum mainnet. Introduces self-repaying loans using yvDAI as initial collateral. Rapidly grows TVL during the DeFi bull market.
  • 2021 — Exploit: alETH Transmuter issue. A bug in the alETH vault allows approximately $18M in over-borrowing. Alchemix reimburses affected users from protocol treasury in an unprecedented move — praised by the community for handling the incident responsibly.
  • 2022 — Alchemix v2 launches. Expands collateral types beyond yvDAI and stETH to include Curve vault positions, multiple Yearn vaults, and Aave deposits.
  • 2022–2023 — Multi-chain expansion. Deploys on Optimism and Arbitrum, bringing self-repaying loans to L2 users.
  • 2024 — Protocol matures. TVL stabilizes as a niche but established DeFi primitive. ALCX governance continues to manage yield strategy allocations and collateral additions.

Common Misconceptions

“Alchemix loans are completely free.”

Alchemix loans use your deposit’s yield to repay the debt — effectively, you forgo the yield you would have earned. The loan is “free” in the sense of no interest charged or liquidation risk, but the yield cost is real. The loan repays itself at the rate of the underlying yield, which can be slow.

“Alchemix positions can never be liquidated.”

The no-liquidation claim applies under normal conditions. Extreme scenarios — such as a catastrophic loss of the underlying yield-generating protocol or alUSD/alETH significantly depegging — could create edge cases. Additionally, the 2021 exploit showed that bugs can create unforeseen conditions.

Social Media Sentiment

  • r/DeFi / r/ethfinance: Alchemix is well-regarded for its self-repaying loan innovation and for handling the 2021 alETH exploit generously (reimbursing users). The concept of “no liquidation” resonates strongly with DeFi users burned by forced liquidations.
  • X/Twitter: Periodic references in DeFi yield and lending discussions. The “self-repaying loan” concept is frequently cited as one of DeFi’s most creative primitives. TVL fluctuations follow broader market conditions.
  • Discord (Alchemix): Protocol mechanic discussions, yield strategy updates, and ALCX governance proposals are primary topics. Community is technically engaged and knowledgeable about vault compositions.

Last updated: 2026-04

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