Visible at https://piratenation.game/leaderboard, the Leaderboard tracks how much Pirate Gold that a given pirate obtains from questing. Future leaderboards will obtain additional information.
There are All Time leaderboards, Daily leaderboards, and Competition leaderboards.
The Competition leaderboards reset every-other Sunday at 00:00 UTC. These 14-day contests award the top 25 Gold-earning Founder's Pirates with a series of increasingly better prizes ranging from Tier 1-3 resources and maps, to craftable and rare items.