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When a forex broker expands into a new market and onboards a new payment service provider, the process involves months of planning, technical integration, and testing. QA is completed. Systems are checked. Everything goes live.
And sometimes, something still goes wrong.
This case study details how Reconbees identified a $130,000 API integration error on the first day of live operation, and recovered $122,000 before the issue could compound or be exploited.
The Context
A Seychelles-licensed forex broker, FSA-regulated, made the decision to expand operations into Argentina. To serve local clients, they onboarded a new PSP and began the technical work of integrating it with their trading platform.
Argentina's currency environment is unusually complex. The country operates with two significantly different exchange rates, an official government rate and a parallel market rate, and the gap between them is substantial. During the API integration phase, both the broker's and PSP’s IT teams reached different assumptions about which rate should be applied to Argentine Peso (ARS) deposits. Neither team identified the discrepancy during QA testing, and the integration went live.
From the moment the integration went live, every ARS deposit was being processed at the wrong exchange rate. Clients were depositing local currency amounts that were being credited to their trading accounts at a higher value than the broker actually received.
The broker was absorbing the difference on every transaction.
This is not a failure that standard QA catches. QA validates that a system works as built, that the code does what it was designed to do. In this case, the system was working exactly as designed. The problem was that the design itself contained a faulty assumption about which exchange rate applied.
Reconbees Intervention
Reconbees flagged that client deposit amounts did not match the credits being applied to trading accounts. The magnitude and pattern of the mismatch pointed directly to an exchange rate error rather than isolated transaction failures.
Within the same day, Reconbees had:
- Identified the root cause: the incorrect exchange rate applied at API level
- Mapped every affected client account across approximately 150 clients
- Calculated the exact financial loss per account and in total
- Reported the full picture to the broker's management and funding team
After corrections were applied, the reconciliation team re-ran all checks to identify any remaining pending items and confirm the final loss figure. The confirmed loss was reported to the accounting team for accurate booking in the broker's financial records. All records were preserved for future audit review.
The Result
- Total loss identified: $130,000 in a single day of live operation.
- Amount recovered: $122,000 a 94% recovery rate.
- Clients affected: approximately 150.
The speed of identification was the decisive factor. A loss that began on day one was caught on day one. Had reconciliation not flagged the issue immediately, the same error would have continued processing on day two, day three, and beyond, with each passing day making recovery progressively more difficult and the unrecovered exposure growing.
The Long-term fix
Following the incident, Reconbees coordinated directly with the broker's development team to address the underlying vulnerability. The outcome was a comprehensive review of all API currency integrations, specifically to identify any other instances where exchange rate assumptions had not been formally validated.
The review ensured that every currency integration in the broker's system was checked against both official and market rates simultaneously, eliminating the category of error that caused this incident.
If your operation processes transactions across multiple currencies or PSPs, and you're not running daily reconciliation, you may not know what's being missed.
Book a free consultation with Reconbees. We'll tell you.
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