The APR's are entirely indicative, based upon assumptions of the exchange rate at the time. Depends on the pool size when you staked LP tokens, the APR would also change accordingly.
While this was not mandated on-chain, but for completeness of the incentive program, there was also a provision to retrospectively airdrop KAR rewards for those who have provided liquidity prior to a certain block number.
Eligible users were retro airdropped a one-time reward (the airdrop is not ongoing or monthly). The total reward amount for all users was equivalent to a prorated portion of one month's 65,000 KAR rewards. Eligible LPs were rewarded pro-rata for their contribution amount and period.
The KAR/KSM pool was opened without additional incentive on purpose, that was to verify the protocol’s built-in ongoing incentive scheme - relying on trading volume and trading fees. The result was promising:
7d Trading Volume: $11.28 M
7d fee earned: $33,840
TVL: $6 M
Extrapolated APR: 29%
This retro airdrop was a way to say thank you to the early adopters and chaos embraces. More details will be disclosed.