Après un rapport d'audit, FXCM me rembourse la différence (en précisant qu'à l'avenir, dans les mêmes circonstances, leur réponse pourra être différente).
Leur explication est intéressante.
Je laisse le copier/coller original en Anglais pour être certain de ne rien déformer par la traduction:
These tickets had the order trigger and start to execute during the ECB interest rate decision on June 14th at 11:45am GMT. During this time, FXCM experienced a delay in receiving the confirmation of the execution. A delay in processing an order (hanging order) may occur if we have not received a confirmation from the liquidity providers that an order has executed. This may occur due to market conditions where a large number of orders have been sent.
As such, FXCM will credit the difference between the trigger price and the closing price.
The adjustment is as follows:
Ticket: 45057986: (1.18177 - 1.17717) * 4K * 0.85 (Pip Cost) = 15.64
Ticket: 45058037: (1.18199 - 1.17698) * 10K * 0.85 (Pip Cost) = 42.59
Ticket: 45058025: (1.18190 - 1.17717) * 8K * 0.85 (Pip Cost = 32.16
Ticket: 45058192: (1.18216 - 1.17715) * 12K * 0.85 (Pip Cost) = 51.10
Total Adjustment: 141.49 EUR
Please note: if you do have an audit in the future, the outcome may be different even though the circumstances may appear similar.
Pour l'instant, j'ai coupé mes algos chez eux.