💵 What is the Dollar Letter Today? Understanding the Mini Dollar Future Code in 2025
If you trade mini dollar futures, understanding the trading code is essential to track the correct asset on your platform. The code follows a standardized structure indicating the contract type, the expiry month, and the reference year.
📌 How does the mini dollar future code work?
The mini dollar code always starts with WDO, followed by the letter corresponding to the expiry month and the last two digits of the year. The formula is simple:
📢 ANÚNCIO - Use o Ad Inserter
WDO + Month letter + Year
For example, if you are trading in August 2025, the contract with the highest liquidity will be the one expiring in September, whose letter is U. Therefore, the correct code will be:
WDOU25
📅 Expiry and liquidity of contracts
Mini dollar contracts expire monthly, and liquidity is typically higher in the contract that expires in the month following the current one. This means that when entering a trade, you should check if you are using the most up-to-date code.
For instance, if you are using the WDOQ25 contract (August), it will lose liquidity as soon as the month turns. In that case, you will need to update to WDOU25 (September).
Although it is possible to trade contracts with a longer expiry, liquidity tends to be lower, which can make it harder to enter and exit positions efficiently.
📖 Expiry letter table by month
| Month | Letter |
|---|---|
| January | F |
| February | G |
| March | H |
| April | J |
| May | K |
| June | M |
| July | N |
| August | Q |
| September | U |
| October | V |
| November | X |
| December | Z |
🧠 Practical tip
Whenever a new month starts, check which contract has the highest liquidity and update the code on your platform. This ensures you are trading the most actively traded asset, avoiding execution issues and slippage.