Ethereum: Foreign media reports: Aave A small number of positions hold half of the debt, and the risk of collateral arbitrage with ETH emerges
Cryptonews
08-21 16:20
Ai Focus
Foreign media reports that a small number of high-leverage ETH margin arbitrage positions on Aave are bearing nearly half of the debt. If the discount on pledged derivatives relative to ETH expands, it could trigger a series of on-chain liquidations.
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8 月 20 日,以太坊单日上涨约 18%,创下近两年来最强单日表现之一。外媒评论认为,这轮上涨虽然带动衍生品市场大规模空头平仓,却没有触及 Aave 借贷结构中更值得警惕的一层风险:少数高杠杆仓位承担了平台近半债务。

Aave 是当前规模最大的去中心化借贷协议之一,总锁仓价值约为 122 亿美元。文章援引链上数据称,平台上约 9% 的仓位,承担了接近一半的总债务。这些仓位大多围绕同一种交易展开:把 ETH 质押衍生品作为抵押物,借出 WETH,再继续质押并循环放大头寸。

9% 仓位承担近半债务

这类仓位的共同点,是抵押物高度集中在流动性质押和再质押代币上,包括 weETH、rsETH 和 wstETH。其中,weETH 单独占相关抵押物的约 42%,这批仓位的债务则主要是 WETH,占比约 73%。

文章称,这部分仓位的债务加权贷款价值比接近 90%,平均健康因子约为 1.06,债务权益比约为 10.7 倍。换句话说,安全垫已经很薄,只要抵押物相对 ETH 的价格偏离进一步扩大,清算就可能迅速发生。

  • Aave 总锁仓价值约 122 亿美元
  • 稳定币存入规模约 89.8 亿美元
  • 稳定币借出规模约 74 亿美元

风险不在 ETH 上涨,而在脱锚

文章认为,这类策略的核心并不是单纯押注 ETH 上涨,而是押注质押衍生品与 ETH 之间维持紧密锚定。交易者先存入 weETH 或 wstETH 等代币,再借出 WETH,随后把借来的 WETH 再次质押,反复循环,以放大质押收益。

问题在于,一旦这些包装后的质押代币相对 ETH 出现折价,整个结构就会承压。按文中测算,若相关代币较 ETH 出现约 8% 至 9% 的折价,这批平均健康因子仅 1.06 的仓位就可能陆续跌破清算线。

文章提到,Aave 在 2026 年 3 月曾因风险预言机参数滞后,触发约 2600 万至 2700 万美元的 wstETH 清算。虽然当时影响范围有限,但已显示出预言机延迟与集中仓位叠加后,可能放大损失。

ETH 大涨暂时掩盖了问题

这篇评论认为,8 月 20 日 ETH 大涨之所以没有引发链上风险,是因为价格上行改善了相关仓位的健康因子,质押衍生品也大体跟随 ETH 上涨,未出现明显脱锚。

但这并不意味着风险已经消失。相反,价格上涨可能让部分交易者继续加杠杆,使仓位在更高价格水平上重新回到相近的健康因子区间。若后续 ETH 回落,或质押衍生品流动性转弱,压力可能重新集中到这批仓位上。

文章还指出,DeFi 借贷协议没有传统市场中的停牌机制,也不存在人工追加保证金的缓冲时间。一旦健康因子跌破 1,清算会在链上自动执行。如果大量账户同时触发,卖出同类抵押物本身又会进一步压低价格,形成连续清算。

历史上并非没有先例

文章回顾称,类似偏离并非假设。2022 年 6 月 Terra/Luna 崩盘期间,Lido 的 stETH 一度较 ETH 折价约 7%;同年 11 月 FTX 风波扩散时,Rocket Pool 的 rETH 也曾短暂跌破锚定。虽然这些偏离最终收敛,但若叠加高杠杆借贷仓位,链上清算会更快发生。

这意味着,市场关注 ETH 单日涨幅和空头爆仓之际,Aave 上更深层的问题并未被真正检验。文章的核心判断是,决定这类仓位是否安全的,不只是 ETH 能否继续上涨,更是质押衍生品在压力环境下能否维持与 ETH 的价格关系。

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