Direct answer
Indirect quotes can behave differently when the market environment makes the translation between the quoted price and the implied price for the other side more sensitive to friction. In practical terms, the “difference” usually comes from changing spreads, liquidity depth, volatility, and execution timing—not from a change in the basic quote definition.
Mechanism or definition
An indirect quote is a quotation that expresses the exchange rate in a way that is not directly the “price of 1 unit of the base currency” as you might expect from a chosen convention. The key mechanic is that an indirect representation can be converted into an implied direct relationship by using an inverse (or an equivalent implied formula).
That conversion is typically stable in theory: if you know the mapping precisely, the implied rate should follow deterministically from the quoted relationship. However, real markets add variable elements:
- Spreads and bid/ask selection: conversion may depend on whether you use bid or ask on each leg.
- Rounding: providers may round intermediate steps differently.
- Execution timing: quotes update as the market moves; converting a stale quote can create apparent inconsistency.
Evidence or example
Consider a simplified, non-real-time example with explicit assumptions. Assume you have a quoted indirect relationship that you can convert to an implied rate using an inverse, and assume the provider quotes both sides (bid and ask). If the market is calm, spreads are narrow and liquidity is deep, so the bid/ask choice matters less and the inverse conversion yields very similar implied results across update cycles.
Now assume the same conversion rule but with these changing conditions:
- Wider spreads (lower liquidity): the bid and ask difference grows. When you convert, the implied “direct” rate will inherit that wider spread, so the behavior can look different (for instance, a bigger gap between implied bid and implied ask).
- Higher volatility (fast price moves): by the time you convert and act on the quote, the underlying relationship may already have shifted. The implied rate derived from earlier quote data can differ from the implied rate derived from later data.
- Different costs and rounding rules: if the provider applies fees, markups, or rounding at intermediate steps, two providers using different conventions can produce different implied outcomes even when both refer to the same underlying market.
In each case, the “difference” is conditional: it appears when market microstructure and provider processing amplify the effects of spreads, timing, and conversion conventions.
Limitations and risks
A common failure mode is treating “indirect quote” as if it were a single fixed behavior that always maps one-to-one in practice. Instead, the observed result depends on assumptions such as:
- Which side of the quote is used for conversion (bid vs ask).
- Whether conversions are applied before or after costs.
- Whether the provider rounds intermediate values.
- How execution works across time (quote streaming vs execution snapshot).
Another limitation is that historical relationships between direct and indirect representations do not establish how they will behave under future spreads, volatility, or venue conditions. Also, outcomes vary with costs, execution quality, and jurisdiction, so you cannot conclude performance from quote behavior alone.
Verification or next question
You can independently verify the relevant facts by checking, in plain documentation or calculations, the provider’s conversion method:
- Identify the exact formula used to transform the indirect quotation into an implied rate.
- Confirm how bid/ask is selected during conversion.
- Note where costs, rounding, and any markups are applied.
- Compare results using the same timestamped inputs to reduce timing ambiguity.
If you want, describe the exact quote convention you mean by “indirect” (which currency is quoted how) and what you are converting into; then the conditions for when the translation becomes more sensitive can be restated using only those definitions.