In most campaigns, the APR is variable and fluctuates based mainly on the total value locked (TVL) in the incentivized asset, which typically increases as more participants join.
The earlier you join a campaign, the higher your potential APR, as rewards are initially shared among fewer participants. As more users join and liquidity increases, rewards are distributed more widely, which can reduce the APR over time.
You can track the TVL evolution of each campaign in its Metrics tab.
Campaign creators can also set a fixed APR, which remains constant throughout the campaign.