PluginsMC
6.0#9 in minecraft plugin repositories€12.99 one-timeWebSelf-hosted
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PluginsMC may suit operators of Paper or Spigot servers looking for modular systems for economies, jobs, auctions, or other listed uses. Its products are described for Citybuild, Survival, and Roleplay servers.
You want what its maker publishes above — check its page for the details.