Reflexer just added FLX/ETH LP staking into the RAI protocol.
Users can now stake their FLX/ETH Uniswap v2 LP tokens to protect RAI in the event of protocol insolvency. Within 5 hours of the announcement and at the time of this proposal, ~35% of the LP has already been staked (https://etherscan.io/token/0xd6f3768e62ef92a9798e5a8cedd2b78907cecef9#balances).
In return for staking, users are given stFLX. The representative value for stFLX will need to be shown to users of Zapper.