Lots vs units in cTrader: what should TradingView send?

What this means in practice

cTrader Algo execution volume is commonly expressed in units. cTrader's Symbol API exposes conversions between quantity in lots and volume in units plus minimum, maximum and step constraints. Choose one webhook convention and normalize before execution. This page is specifically about “Lots vs units in cTrader: what should TradingView send?”, so each scenario below is explained by its own mechanism instead of sharing one generic diagnosis.

Real-world scenarios

Scenario A — TradingView sends lots

Compare requested size with the cTrader symbol minimum, maximum and step. Convert to one canonical internal unit, normalize once, and log requested versus submitted volume. For Scenario A — TradingView sends lots on question 71, use that evidence specifically to answer “Lots vs units in cTrader: what should TradingView send?”; keep it separate from the evidence for the other scenarios on this page.

Scenario B — TradingView sends units

Compare requested size with the cTrader symbol minimum, maximum and step. Convert to one canonical internal unit, normalize once, and log requested versus submitted volume. For Scenario B — TradingView sends units on question 71, use that evidence specifically to answer “Lots vs units in cTrader: what should TradingView send?”; keep it separate from the evidence for the other scenarios on this page.

Scenario C — Risk engine calculates units

Compare requested size with the cTrader symbol minimum, maximum and step. Convert to one canonical internal unit, normalize once, and log requested versus submitted volume. For Scenario C — Risk engine calculates units on question 71, use that evidence specifically to answer “Lots vs units in cTrader: what should TradingView send?”; keep it separate from the evidence for the other scenarios on this page.

What to check

• symbol metadata and unit conversion
• configured risk or management rule
• broker min/max/step or distance constraint
• normalized value actually sent to cTrader

Practical rule

For “Lots vs units in cTrader: what should TradingView send?”, change only the first layer whose evidence no longer matches the intended action. Preserve signal identity, timestamps and final cTrader state, and reproduce execution-affecting changes on demo before live use.