This is a list of the optimal equipment for this method of platinum farming.

• A Stealth Frame (Best frames for this: Loki>Ivara>Limbo>Ash) You can also use a Huras Kubrow or Shade.
  
• An AoE passive damaging frame. (Best frames for this: Ember/Day Form Equinox)
  
• A Radar Mod (Either Natural Instinct or Thief's Wit or Loot Detector)
  
• At least 90 minutes each day.

The worst part of this method is to get it set up. You need to have at least two max ranked syndicates or three if possible (best way). To do so, you'll need to carefully select which one you want to pick mods/parts/weapons from, for yourself. This will require a Forma, an Orokin Catalyst/Reactor, some Prime Parts & Credits, lots of them. Even though it may seem expensive, it will prove to be worth at least 100+ plat each 3-4 days for only 90 minutes of farming each day.

Once you have your syndicate at the highest rank, and the daily missions available, you're going to pick the Warframe you will use accordingly to the mission. For any : Sabotage/Rescue/Spy you should pick your Stealth Setup. For any Mobile Defense/Defense/Survival/Excavation/Interception you should pick your AoE Damaging Warframe. In BOTH CASES, make sure to have at least one of the Radar Mods active to detect Syndicate Tradeable Items that will appear on the map.

If you're playing a stealthy mission, you should pick AoE Damaing weapons to swing around and destroy any white case appearing on your minimap, and closely look for all possible item to gather. (This is also a great way of getting Ayatan Scultpures and Rare Containers). I recommend doing these missions SOLO, because you don't need anyone to finish the mission before you are done, or before you checked every room.

Now for Aoe Passive Damaging Setup (APDS) you will have to have a high-energy/efficiency/damage build (can be hard to achieve, do you best) because you will run around with the same purposes as mentionned above. However you will be under a timer in most case, so be sure to check the SOLO option if you're not sure of your ability of gathering all medalions as fast as possible.

The reason why you should an APDS is because you're going to use (and this works for any mission, even stealthy ones) a specific Syndicate Sigil on your warframe. If you're carefull about your Fashion Frame, just put it in the back with lowest brightness and it won't ruin your super Gold/Pink Hydroid Setup. These Sigils, should either be the 13% Increase to Standings gained that you can get for free when completing the last rank of a clan, or the +15% (worth 50k standings) if you're going for a low farm. (+2% may look minor but it can increase your Standing/Mission up to 500.) Because Sigils convert a share of the affinity you obtain, and that you cannot kill while running around, you will need to have an APDS to gain increased standings, while gathering your Tradeables. This may lead to +12K Standings/Endless Mission (not counting the medallions).

> Now that you have your 135.000 Standings, you can purchase your weapons/mods/syandanas first and repeat this farming method every day, to sell a weapon for ~30 plats every 3 to 4 days which will lead to up to 250 Plat in a Week for only 90 Minutes every day!

Credits - Madamou