S.T.A.R.T.
Overview
The P2W Vendor (or Transact 4 Victory in Praetoria) sells, for in-game currency, everything which players could spend real money on before the 2012 shutdown. It also offers access to some additional functionality. P2W Vendors are located in the tutorials, in the starting zones (Atlas Park, Mercy Island, and Nova Praetoria), Pocket D, and some additional locations such as replacing the jetpack vendors in Grandville and the Shadow Shard.
Custom XP Rates
If you are not level 50, you can select a custom XP rate. This reduces inf gain by a like amount and lasts for eight hours or until cancelled in the Powers window.
Inspiration Drops
For small inf fees, you can disable inspiration drops by type (eg accuracy, damage, endurance) or size, or re-enable ones you have disabled. You can also enable dual and team inspirations.
Prestige Enhancements
These 5 enhancements are free, but unique. Until level 21, these are some of the best enhancements you can use.
Prestige Powers
Attacks
You can select which of the 5 Origin Powers to have. (You may need to first Revoke the one you have, below.)
You can also choose from a selection of melee and ranged prestige attacks. These are free if you have fewer than three total.
Buff Pets
You can buy pets that boost your Resistance and Damage or Defence and Recovery. One is free, but if you want more than one, it will cost a million inf.
Just for Fun
100,000 inf: the Flying Disc and Snowball powers.
Sprints
Free: grants all the prestige sprints. Note that it cannot be revoked.
Travel
1,000,000 inf: the Flying Carpet, Void Skiff, and Rocket Board flight powers. These provide reasonable speed, but are expensive and stop other powers from working while in use.
The Jump Pack and Steam Jump powers, which are identical apart from their appearance. One is free, but a second will cost you 100,000 inf. They let you jump as high as you like for 30 seconds, then cool down.
The Beast Run and Ninja Run powers, which increase running speed considerably and jumping height somewhat. They are also identical other than their appearance, and the first one is free but the second costs 1,000,000 inf.
1,000,000 inf: the Coyote Travel Power and Panther Travel Power. These transform you into the relevant animal, suppress other powers, and boost your running speed considerably.
1,000,000 inf: Assemble the Team (free if you have the Paragon badge).
1,000,000 inf: Base Transporter
1,000,000 inf: Mission Transporter
10,000,000 inf: Team Transport Power
1,000,000 inf: Pocket D VIP Pass (free if you have spent 5 hours in Pocket D)
Utility
The Mystic Fortune, Inner Inspiration, and Secondary Mutation powers; the first is free, but the others cost 500,000 inf.
1,000,000 inf: Return to Battle or Renewal of Light. These self-rez powers are mutually exclusive. They are free if you have the The Unbroken Spirit badge.
10,000 inf: the Reveal power.
10,000,000 inf: the Portable Workbench (free if you have the Field Crafter badge).
100,000 inf: the Self Destruction power.
10,000 inf: the Shadowy Presence stealth power.