Maya Preferred 223 claims to be backed by gold and silver reserves and a faster implementation of a blockchain with smart contracts running on Ethereum Classic. 
It was designed to be used as a decentralized ‘stable crypto asset’ within the Ethereum Classic ecosystem and beyond.

Maya Preferred

Trust Wallet

MetaMask

Ethereum

Shiba Inu

Chainlink

UNUS SED LEO

Uniswap

Aave

Pendle

Gala

Wormhole

FLOKI

Render

Ondo

Bitget Token

The Sandbox

Axie Infinity

Digital Asset Rights Token

Origin Ether

Advanced Project

ECOMI

DORK LORD

Jinbi Token

Krosscoin

Yobit Token

EOSDT

Future1coin

BlockCDN

BoutsPro

Bitcoin Dominica

Tachyon Protocol

MyToken

Obitan Chain

Super Bitcoin

Pascal

Quotient

BRCP TOKEN

Graviocoin

Fei protocol is a DeFi native algorithmic stablecoin. The aim of Fei is to propose a technological solution in a sweet spot between rigid overcollateralized decentralized stablecoin and centralised custodial stablecoins.

Fei Protocol runs on two crypto assets: FEI stablecoin and TRIBE governance token.

FEI is aimed to be a more capital efficient and fully decentralized stablecoin. The protocol uses the value it controls to maintain liquid secondary markets and earn yield for the protocol.

The project was founded in December 2020 and immediately attracted significant interest in the crypto community. It resulted in $19 million VC investment in early March 2021. Among the names that have entered this project are Andreessen Horowitz (a16z), Coinbase Ventures, Nascent and Framework Ventures.

There were some issues with the peg in the original mechanism, but through a series of governance upgrades the protocol recovered in the months following launch.

Fei v2 intends to be a major upgrade for the system and will launch in late 2021. It features 1:1 redeemability for FEI against protocol reserves, TRIBE buybacks and backstop, and algorithmic protocol controlled value management.

Fei USD

QuadrantProtocol

sUSD is a synthetic USD token enabled by the Synthetix protocol. It tracks the price of the US Dollar through price feeds supplied by Chainlink’s decentralized network of oracles. sUSD is integrated across the DeFi ecosystem as one of the most liquid decentralized stablecoins, including at Curve. It can be traded without slippage for other assets native to the Synthetix protocol at Kwenta or Synthetix.Exchange.