FX Spread

Definition

FX spread is the difference between the buying and selling exchange rates quoted for a currency pair by a venue or provider.

Overview

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Context and purpose
How it works
Practical checks and failure points
Related concepts

Context and purpose

The provider’s bid is what it pays for the base currency, while the ask is what it charges. The spread compensates for liquidity, inventory, volatility, credit, operational costs, and profit margin. A narrow advertised spread may apply only to small size or exclude commission, markup, transfer fees, and intermediary conversion. Crypto-fiat routes can add exchange, stablecoin , banking, and settlement costs. Spreads may widen around illiquid periods or major events. Users should compare executable bid and ask rates at the required amount and calculate the final received currency after all charges. Businesses should define rate sources, markups, validity windows, and reconciliation . Large conversions may benefit from quotes across several approved providers. FX Spread can appear in the same workflow as stablecoin and reconciliation, but the records should remain separately identifiable. A relationship between them does not prove that pricing, execution, settlement, custody, or accounting has completed.

How it works

An FX spread is the difference between relevant buy and sell quotes, or between an applied exchange rate and a stated reference rate, depending on the context. It can be a material cost even when an explicit fee is zero.

Practical checks and failure points

Identify quote direction, reference source, rate lock, execution time and whether advertised fees include spread.

Crypto Refund Exchange Rate · Stablecoin Reserve Custodian

Example

A rate shows €0.91 per dollar when the midmarket rate is €0.92. On $10,000, the €100 difference is economically significant before other charges.

Comparison

The spread differs from a flat transaction fee and from market movement during quote expiry.

Key Takeaway