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ETH 2x Flexible Leverage Index (ETH2x-FLI-P)
ETH2x-FLI-P is native to Polygon

The Polygon-native version of the ETH 2x Flexible Leverage Index abstracts collateralized debt management into a simple index, reproducible by an ERC20 token built on Set Protocol. ETH2x-FLI-P enables you to get leveraged exposure to Ether using collateralized debt, without having to manage collateralized debt positions or monitor liquidation risks. ETH2x-FLI-P targets a long 2x exposure to MATIC and employs a flexible leverage mechanism for optimal rebalancing outcomes.
The methodologist behind the FLI is Pulse Inc. (DeFi Pulse).
ETH2x-FLI is the original ETH2x product on Ethereum main net, while ETH2x-FLI-P is a distinct, Polygon-native product. You can find more information on how the two tokens are different in this article: Differentiating the ETH2x Products.