Add notes on derivative protocols

DeFi/Derivatives/README.md

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+# Notes on Derivatives
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+<br>
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+
+## Synthetix
+
+* [Synthetix](https://synthetix.io/) is one of the Ethereum's ecosystem's leading derivatives projects.
+* It's a derivative liquidity protocol that powers the creation of "synths" (synthetic assets) that can be traded in a decentralized and permissionless manner.
+* Synths let traders capitalize on exposure to assets without having to directly own the assets in question.
+* Some of Synthetix's most popular synths are its forex synths: sUDS and sEUR.
+* A foundational element of Synthetix is SNX staking, which is used for collateralizing the derivatives protocol and for creating deep liquidity for synths.
+* SNX stakers earn inflationary SNX rewards and a cut of sUSD fees generated by protocols that work on top of Synthetix. 
+
+<br>
+
+
+### Kwenta
+
+* The primary DEX in the Synthetix ecosystem.
+* Designed to facilitate zero-slippage synth trading.
+* It does not rely on an orderbook or liquidity pool model, but instead the DEX employs a peer-to-contract system in which synths are traded against a smart contract informed by Chainlink price feeds.
+
+<br>
+
+### Lyra
+
+* Lyra is a decentralized options trading protocol powered by a specialized AMM system.
+* It uses Synthetix's sUSD stablecoin as its exclusive quote asset, so traders pay for opening long positions or closing short positions with sUSD.
+* Lyra also uses Synthetix as a one-stop protocol for getting long and short exposure on its markets' base assets (delta hedging).
+
+<br>
+
+### Thales
+
+* Decentralized binary options protocol that a group of Synthetix community members spun in 2020.
+* If held until expiry, binary options have only two payoff possibilities: a predetermined amount of profit or nothing.
+* Relies on Synthetix's sUSD stablecoin for minting its binary options tokens and as the platform's unit of account.
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+
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