The foreign exchange market processes $9.6 trillion in daily volume, according to the BIS 2025 Triennial Central Bank Survey, up 28% from $7.5 trillion in 2022. The vast majority of that volume trades at or near the interbank mid-market rate, the rate at which banks trade with each other. The rate that platforms receive when converting currency through their banking partners is not this rate. The difference between the two is where a significant portion of cross-border payment cost hides.
Understanding how FX pricing works at the institutional level, how markups are embedded, and why the pricing tier a platform accesses depends on its infrastructure is essential for any treasury team managing multi-currency operations. The FX market is not opaque by design. It is opaque by default, because most platforms lack the infrastructure to access the tier where transparency is the norm.
How the interbank market works
The interbank FX market is an over-the-counter network where global banks trade currencies directly with each other. There is no central exchange. Pricing is determined by supply, demand, and the continuous flow of quotes between market makers. The mid-market rate at any given moment is the midpoint between the best available buy and sell prices across the market. Trading is concentrated: the UK, US, Singapore, and Hong Kong account for 72% of global turnover.
At this tier, spreads are measured in fractions of a basis point for major currency pairs like EUR/USD or GBP/USD. A bank trading $100 million in EUR/USD with another bank might pay a spread of 0.01%, or $10,000. The market is deep, liquid, and efficiently priced because the participants are large institutions with real-time access to global liquidity.
The ECB's foreign exchange reference rates, published daily as a benchmark, are widely used for accounting and valuation but are not transaction rates. Actual interbank trades execute throughout the day at fluctuating rates, and the pricing at this tier is transparent to all participants.
How markups get embedded
Below the interbank tier, FX pricing becomes progressively less transparent. When a bank provides FX conversion to a corporate or platform client, the rate includes a markup above the interbank rate. This markup is not disclosed as a separate fee. It is built into the rate itself. A platform sending US dollars to British pounds might see a quoted rate of 1.2650 when the interbank mid-market rate is 1.2700. The difference, approximately 0.4%, is the embedded spread. On a $1 million conversion, that spread costs $4,000. On $100 million annually, it costs $400,000.
The markup reflects several components: the bank's cost of hedging the position, the credit risk of the counterparty, the operational cost of processing the conversion, and a profit margin. For a large corporate client trading liquid currency pairs, the total markup might be 5 to 15 basis points. For a smaller platform trading emerging market currencies, the markup might be 50 to 200 basis points or more.
The World Bank's Remittance Prices Worldwide data shows that the global average cost of sending $200 remains approximately 6.5%, with banks averaging significantly higher than specialist money transfer operators. A substantial share of this cost is embedded FX rather than explicit fees. The embedded markup model persists because most platforms do not benchmark their FX rates against the interbank mid-market rate at the exact moment of execution.
The pricing tier depends on infrastructure
The FX rate a platform receives is determined primarily by how it accesses the market. Traditional correspondent banking relationships bundle FX with clearing, custody, and other services. The rate reflects overall relationship economics, not per-transaction pricing efficiency.
This bundling creates cross-subsidisation. A bank that earns less on clearing or custody may price FX wider to maintain overall relationship profitability. A platform with no alternative access point has no leverage to negotiate, because the FX is embedded in the relationship rather than contracted as a standalone service. On a currency pair like USD/PHP or GBP/KES, the gap between retail correspondent pricing and wholesale interbank pricing can exceed 100 basis points.
Wholesale FX pricing operates differently. When FX is accessed through infrastructure designed specifically for multi-currency clearing, the conversion is priced at or near the interbank rate with a transparent, disclosed spread. The platform sees three numbers: the mid-market rate, the spread, and the total cost. Each is auditable. Each can be benchmarked against market data. For a platform processing $10 million monthly in emerging market corridors, the annual cost difference between these tiers is measured in hundreds of thousands.
Transparency as infrastructure
FX transparency is not a reporting feature. It is a property of the infrastructure. A correspondent bank that bundles FX into the relationship has no structural incentive to make the markup visible. An institution that provides multi-currency clearing with FX as a transparent, separate component has the opposite incentive: the pricing is competitive because it is visible, and the institution earns revenue on clearing infrastructure, not hidden spreads.
For treasury teams managing multi-currency operations, the shift from embedded to transparent FX pricing changes the management paradigm. Instead of accepting whatever rate the bank provides and trusting that it is reasonable, the team actively manages FX as a cost centre with measurable, optimisable economics. Conversion timing can be optimised based on market conditions. Currency pair routing can be adjusted based on spread analysis. Total FX cost becomes a managed metric rather than an accepted overhead.
Making the comparison
Platforms evaluating their FX infrastructure should run a side-by-side analysis across their highest-volume currency corridors. For each corridor, compare the current average markup, measured against mid-market at the time of execution, against wholesale interbank pricing. The analysis should include all conversion costs: the explicit spread, any fixed per-transaction fees, and the timing cost between when the conversion is requested and when it executes.
The results typically reveal patterns:
The aggregate cost across all conversions in a quarter is the platform's actual FX expense, distinct from any explicit fees. Platforms that have not recently benchmarked their FX costs should run a 30-day audit: record every conversion, compare every rate to mid-market, and calculate the aggregate spread. The number will inform whether the current banking infrastructure is cost-effective or whether embedded markups are quietly eroding margins.
Lorum provides wholesale interbank FX pricing across 30+ markets as part of its clearing and named custody accounts infrastructure. Transparent rates, disclosed spreads, and auditable execution across every currency corridor. The cash management infrastructure makes FX cost visible, measurable, and manageable as a distinct line item. The pricing tier a platform accesses is not a negotiation outcome. It is an infrastructure decision.
