How QuietRate describes source observations, derived rates, timing, and reference-rate context.
QuietRate's 31-currency production catalog uses European Central Bank (ECB) reference exchange-rate observations and Taiwan Futures Exchange (TAIFEX) Daily Foreign Exchange Reference Rates.
Source: European Central Bank (ECB) reference exchange rates.
Source: Taiwan Futures Exchange (TAIFEX) Daily Foreign Exchange Reference Rates.
That result is a QuietRate-derived cross rate; it is not a cross rate published by the ECB or TAIFEX.
Source: European Central Bank (ECB) reference exchange rates.
The ECB side of QuietRate consists of EUR plus 29 ECB-quoted currencies. The verified daily production series follow the ECB reference-rate family EXR.D.<CUR>.EUR.SP00.A.
QuietRate retrieves these ECB observations through api.frankfurter.dev, with the provider explicitly filtered to ECB. Frankfurter is the API transport layer for this path; it is not the institution that originates the ECB observations. QuietRate does not use Frankfurter’s default blended rates for the ECB path.
Source: Taiwan Futures Exchange (TAIFEX) Daily Foreign Exchange Reference Rates.
QuietRate uses official TAIFEX USD/TWD reference observations for TWD. The related Taiwan government open-data listing is dataset 11339, published by the Securities and Futures Bureau and identifying the data as Taiwan Futures Exchange daily foreign exchange reference rates. The dataset is released under the Open Government Data License, version 1.0 (OGDL-Taiwan 1.0).
Source observations and QuietRate-derived cross rates are not the same thing.
When a TWD pair requires observations from both source families, QuietRate calculates a cross rate from underlying ECB and TAIFEX reference-rate observations that share the applicable effective date. That result is a QuietRate-derived cross rate; it is not a cross rate published by the ECB or TAIFEX.
These describe different things.
A rate retrieved today may therefore carry an earlier effective date. Retrieval time does not change the source observation’s effective date.
QuietRate may persist original source observations locally on your device for app functionality, caching, and offline use. Source values, effective dates, and provenance remain source-faithful when cached. QuietRate-derived rates remain identified as derived rather than being relabeled as ECB or TAIFEX observations.
Reference exchange rates are informational values, not executable or guaranteed transaction rates. Banks, card networks, merchants, money-transfer providers, and other services may apply different timing, spreads, fees, conversion methods, or proprietary rates.
QuietRate uses factual source attribution and does not use ECB or TAIFEX logos or imply endorsement.
ECB policy permits reuse of publicly released ESCB statistics subject to attribution and source-faithful representation when presented as ECB statistics. OGDL-Taiwan 1.0 permits reuse subject to its attribution requirements and does not grant trademark rights. QuietRate-derived calculations are identified separately from source observations.