Data & API

Everything RateUSD displays comes from a named provider with a published timestamp. Here is how that works.

Data flow

Rates are fetched server-side, cached briefly to avoid hammering upstream providers, and rendered into the page. The provider layer is swappable: pages render whichever source is connected, and always print that source's name, rate type and publication time alongside the figures.

Rate types you will see

Reference rate — a daily benchmark published by a central bank or similar authority.
Mid-market rate — the midpoint between bid and ask across the interbank market.

Neither is a dealable price. Both exist for measurement, accounting and comparison.

Historical coverage

Historical series are available for the subset of currencies the connected series provider covers. Where a pair has no series, the chart says so rather than interpolating. Chart periods run from five days to the full available history.

Public API

RateUSD does not currently expose a public API. If you need programmatic rates, go to the upstream publisher directly so you inherit their terms, uptime guarantees and attribution requirements. Tell us if that would be useful to you.