Instruments, symbols, and rollover
How Lune maps your broker's contracts to symbols, lets you override a wrong mapping, and converts symbols across brokers when you copy.
Every order Lune places names a real broker contract. This page covers how Lune maps your broker's contracts to symbols, how to override a mapping when the default is wrong, and how symbols convert across brokers when you copy trades.
What an instrument is#
An instrument is a tradable futures contract, such as the E-mini S&P 500 (ES) or the Micro Nasdaq (MNQ). Each broker names its contracts in its own way, so Lune keeps a mapping from your broker's contract names to a clean symbol you see in the app. Lune supports 50+ CME products with exact tick and point specifications, so P&L and sizing stay correct.
View your contract mappings#
Open the Contracts page in the dashboard to see the active broker contract mappings for your connected accounts. This is where Lune shows which broker contract sits behind each symbol you trade.
Contract specs (tick size, point value) are what make P&L accurate. Lune uses the correct spec per instrument, so a filled trade shows the right dollar value, not a raw price difference.
Override a mapping when it is wrong#
Sometimes the default mapping is not what you want. The broker may expose an unexpected contract, or you may prefer a specific one. On the Contracts page you create a contract override to tell Lune which contract to use instead.
In the dashboard, open the Contracts page for the account you want to adjust.
Locate the symbol whose mapping is wrong or that you want to pin to a specific contract.
Create an override that points the symbol at the contract you want. Lune uses your override from then on for that symbol.
Use an override when the auto-mapped contract is not the one you trade, or when you want a specific contract locked in. Your override wins over the default mapping.
Symbol mapping across brokers#
When you copy trades with the Trade Copier, the leader and a follower can trade different variants of the same product. Lune maps them for you. For example, ES on the leader can map to MES on a follower, or NQ can map to MNQ.
This mapping is a pure symbol swap. It changes only the contract, not the size. Your follower size comes from the multiplier you set, so a variant swap never changes your quantity on its own. To learn how sizing works, see scaling across accounts.
A micro is not a smaller-sized mini. Mapping ES to MES swaps the contract only. If you want a follower to trade a different quantity, set its multiplier. The map and the multiplier are separate controls.
You can also set custom per-symbol overrides for cross-broker setups, so a symbol on the leader routes to the exact contract you want on each follower.