web3: Polymarket Adjusts settlement rules to address manipulation disputes
CoinDesk
5h ago
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Polymarket modifies the settlement method of the short-term crypto market, switching to TWAP to compress the price manipulation space around settlements.
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Polymarket已调整短周期加密合约的结算方式,不再使用单一时点价格,而是改为时间加权平均价(TWAP)。这一变化出现在交易者持续投诉、研究人员公开指出结算窗口存在操纵迹象之后。

研究指向结算前数秒异常交易

一项针对比特币 5 分钟合约的研究显示,在结算前最后几秒,币安上反复出现大额交易,随后比特币价格迅速反转。这类模式被认为可能与结算操纵有关,即先在 Polymarket 建立仓位,再在现货市场短时推动价格,让合约按有利方向结算。

研究覆盖约两个月的 5 分钟比特币合约。研究人员称,821 个账户在他们划定的疑似操纵窗口中合计获利 820 万美元。论文没有直接证明下单者意图,也未确认现货交易者与 Polymarket 持仓者为同一批人,但在剔除做市商后,疑似被操纵窗口中 93% 的损失由零售交易者承担。

新规则改用短窗口均价

Polymarket表示,为保护加密涨跌市场的完整性,平台已更新结算方式,并将在 8 月为受影响市场提供 100 万美元流动性奖励,帮助过渡。

按新安排,5 分钟市场将采用 30 秒均价,15 分钟和 4 小时市场采用 60 秒均价。数据由 Chainlink Data Streams 提供。与单点快照相比,短窗口均价会提高临时拉抬或打压价格的成本,降低最后几秒交易对结算结果的影响。

类似问题并非 Polymarket 独有

报道提到,类似争议并不只出现在 Polymarket。竞争平台 Kalshi 也被讨论过是否存在结算脆弱性。Kalshi 向 CoinDesk 表示,其市场使用受监管的 CF Benchmarks 价格指数,并采用 60 秒移动均价,同时所有交易者都完成实名验证,因此更容易调查可疑活动。

Kalshi称,离岸市场仍可能影响价格,但基于受监管交易所的移动均价,会让短时扭曲价格变得更难、成本更高。该公司还表示,今年迄今已向美国商品期货交易委员会转交约 40 至 50 起案件线索,不过这一数字并不限于短周期加密市场。

在研究发布前,链上分析人士和市场参与者已多次公开提示 Polymarket 5 分钟加密市场的操纵问题。随着平台改用 TWAP,短周期预测市场的结算设计是否足以抑制类似行为,将继续受到交易者关注。

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