Jumbo is a new AMM on NEAR Mainnet. It received a grant from the NEAR foundation.

They are now offering rewards to users who trade the $JUMBO/$wNEAR pair in the next 48 hours. (Feb 18 13:54 UTC to Feb 20 13:54 UTC) 

The rewards are only for trading. You do not need to LP. There is no minimum mentioned.

Read the tweet here.

To be eligible for the rewards, go to https://jumbo.exchange/swap and make trades between $wNEAR and $JUMBO. It is not possible to trade directly between $NEAR and $JUMBO. Swap your $NEAR to $WNEAR first.

(If you don’t have a NEAR wallet, get one at https://wallet.near.org/create.)