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大多數去中心化穩定幣採用彈性供給的貨幣政策，用高利率激勵用戶在穩定幣的價值降至盯住匯率制度以下時繼續持有。其運行機制是這樣運行的： 當需求低迷導致穩定幣價值低於盯住匯率時，收縮供給；當穩定幣價值由於需求突然增加而高於盯住匯率時，擴大供給。用戶必須將穩定幣鎖定在自己的帳戶中，直到價值達到其盯住目標的價值為止，才能獲得系統利率帶來的收益。利率本質上與傳統銀行為儲蓄用戶提供的年利率相似。 案例：Nu 抵押率：0
抵押品：無抵押
掛鉤貨幣：美元
第一個使用彈性供應模型的穩定幣是 Nu，它採用 PoS+POW 的混合權益證明，基於點點幣創造出來。Nu 採用雙幣結構，發行兩種代幣： Nubits：與美元掛鉤的穩定幣。
NuShares（NSR）：具有固定供應，持有 NuShares 的人具有治理權。
NuBits 發行量由市場需求決定，存放利率調節，價格則直接採用買、賣牆的形式，把價格完全固定在 1 美元。 當市場需求增加時，Nubits 的賣牆消耗殆盡，NuShares 持有人可以投票發行更多的 Nubits 以滿足市場的需求。當市場需求減少時，再通過買牆、利率和轉 NSR 等機制回收流動性，充分的滿足市場對 Nubits 的需求。 弱點 Nubit 的盯住匯率制度在 2017 年 12 月、2018 年 4 月先後被打破。我猜測，Nubit 持有者已經決定在 2017 年 12 月出售 Nubit 購買比特幣（當時比特幣價格接近 2 萬美元），以利用比特幣年底價格突然上漲的機會。 Nubits 的拋售帶來了價格大跌，希望購買比特幣等波動性資產的 Nubit 持有人帶來的拋壓超過了希望獲得系統利息的 Nubits 儲戶及 Nubit 託管人（由 NuShares 持有者選舉產生）的買壓。 最終，Nubit 未能從第二次崩盤中恢復過來，失去了大部分價值和在用戶中的信譽。一些用戶甚至稱 Nubit 是一個騙局，威脅要起訴創始團隊。 Nubit 的彈性供給穩定貨幣機制中，託管人存放的穩定幣和新鑄造的穩定幣進入交易所買賣牆，用來干預與美元的匯率，也就是 Nubit 的價格。在極端情況下，系統利息和新鑄造的穩定幣可能無法以足夠快的速度產生大量資本保證 Nubit 盯住掛鉤匯率，而且它在「脫鉤」中產生的利率很難量化。 不過，成本效益或許可以解釋為什麼彈性供給貨幣仍然收到穩定幣初創團隊歡迎。在彈性供給貨幣系統中，動態供給率和完全沒有加密資產抵押使得它們對於部分或者完全抵押型的穩定係統更具成本效益。 在現實中，大多數國家的貨幣體系沒有任何金融資產儲備，幾乎完全依靠靈活的利率和彈性的供應政策來維持其貨幣價值，同時促進經濟增長。不過在短期內，大多數穩定幣可能沒有足夠高的需求和供應來保證價格穩定，因此不得不通過完全或超額抵押來實現價格穩定。 7 a' r0 e! }, w* e. p8 E! ?+ P
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