There are many ways you can get platinum in warframe. For example: 1. Selling prime parts 2. Earning platinum through syndicates 3. Selling corrupted mods 4. Dual stat elemental mods 5. Ayatan sculptures 6. Selling veiled riven mods 7. Nightmare mods 8. Aura mods 9. Get prime access or prime vault 10. Clan prizes 11. Login rewards