Here is a list of currencies available in the game.
AP Orb
AP Orb is a free currency you need to increase your max AP. You need to get 3 AP Orbs to see your AP bar increase by 1.
You will get an AP Orb for either entering or completing a dungeon with an 
or 
icon that you will encounter in the Main Story mode, or watching Sub-Scenarios from characters that you already obtained. (Events dungeons with or won't give you AP Orbs, and characters pre-obtained by gacha MAs also won't have a Sub-Scenario until you complete their regular recruitment quest).
Diamond (JP exclusive)
Unlike WW version, JP version has 2 currencies: Diamond (Freemium) and Mirrogem (Premium). All compensations/rewards are given in JP in diamonds. Mirrogems are a premium currency only.
Ratio: 1 Diamond = 10 Mirrogems.
You can store up to 999,999 Diamonds.
Event currency
Some events will provide event-exclusive currencies obtainable by defeating enemies in stages or completing certain missions. These currencies can be traded in a limited-time trading shop to get various items.
Friend Point
Friend points are a free currency given each time you take a follower/following or an unknown player as your helper in a quest. Friend points are used in the Friend Points summon which will usually reward Anima Orbs, Chiral Crystals, and weapons varying from 1★ to 4★ (Only limited to story characters)
You will get:
- 50 FP if
- 40 FP if or
- 30 FP otherwise
You can store up to 50,000 FP.
Gald
Gald is your main in-game income to enhance/limit boost weapons/mirrages.
You can obtain Gald by:
- Doing dungeons.
- Exchange with event currency
- Event Missions, usually from limit boosting and enchancing event weapons.
You can store up to 99,999,999 Galds.
Mirrogem
Mirrorgems are the main source of summon for WW and 2nd one for JP (see Diamond).
WW
You can get Mirrogems by:
- Doing quests and clear objectives
- Clear some missions
- Compensation
- Buying them
JP
You can get Mirrogems by:
- Buying them
Prices (only as reference)
Date: 09/26/2017 (Los Angeles, California)
| Mirrogems | Amount | Prices in WW (USD) | Prices in JP (USD) | |
|---|---|---|---|---|
 | WW | 50 Mirrogems | $0.99 | $1.07 |
| JP | ||||
 | WW | 210 Mirrogems | $3.99 | $4.29 |
| JP | ||||
 | WW | 490 Mirrogems | $7.99 | $8.57 |
| JP | ||||
 | WW | 1040 Mirrogems | $16.99 | $17.86 |
| JP | ||||
 | WW | 2020 Mirrogems | $31.99 | $33.93 |
| JP | ||||
 | WW | 3100 Mirrogems | $47.99 | $51.78 |
| JP | ||||
 | WW | 4750 Mirrogems | $74.99 | $87.50 |
| JP | 6150 Mirrogems | |||
Sales can happen for:
 |  |  |
|---|---|---|
| 2020 Mirrogems | 3100 Mirrogems | 4750 Mirrogems (WW) |
| 6150 Mirrogems (JP) |
You can store up to 999,999 Mirrogems.
Prism
Prisms are a freemium currency which allow you to buy costumes and weapons & default mirrages from the Turtlez Shop.
You can get Prisms by:
- Summoning x10 times with Mirrogems
- Summoning once with Mirrogems (JP exclusive)
- Completing certain missions
- Selling weapons/mirrages
- Purchasing them from an event's trading spot if available
You can store up to 999,999 Prisms.