$ · North America
US Dollar (USD)
The US dollar is the reference point of the foreign exchange market: most cross-border trade is invoiced in it, and most currency pairs are quoted through it rather than directly. That is why Fiat Agent stores every reading against a USD base and derives every other pair by division.
Reference reading
1USD per 1 USD
Read 10 Nov 2026, 15:30 UTC, source last published 10 Nov 2026, 00:00 UTC, quoted against USD.
166 currencies in this reading
One USD buys
- EUR
- 0.8925
- GBP
- 0.7447
- JPY
- 158.0223
- INR
- 93.9231
- MXN
- 18.572
Where the US Dollar circulates
When you display a dollar figure, you are almost always displaying two things at once — the price of the goods and the price of the dollar against whatever currency your reader thinks in.
- Cross-border invoicing and settlement for most commodity and goods trade.
- The base leg of most published currency quotes, including every quote in this catalogue.
- Reserve holdings and dollar-denominated debt outside the United States.
- Local legal tender beyond the US, including Ecuador, El Salvador and Panama.
How it is quoted, and what to watch
Because the stored base is USD, a USD quote is exactly 1 in every reading and any pair is the quotient of two other quotes. Amounts should be formatted with Intl.NumberFormat and the USD code rather than a hand-written dollar sign, so locales that place the symbol after the number stay correct.
Reading USD from the API
Ask for USD as the base and every quote in the response is re-expressed against it — the reading, the catalogue and the account balance all arrive together.
Crosses are the quotient of two published quotes, so a pair you need but we do not list is still one division away.
curl · re-quote the catalogue against this currency
curl -s "https://fiatagent.base44.app/api/v1/rates?base=USD" \
-H "Authorization: Bearer $FIAT_AGENT_KEY"USD questions, answered
How do I convert USD to another currency with this API?
Read the catalogue once — a single response contains every code — then multiply by that code's quote. With a USD base, rate(USD → EUR) is simply rates.EUR.
Why are all rates quoted against the dollar?
One base keeps the arithmetic honest and auditable: every pair is derived from published quotes rather than from a second source. Any other base is available on the API with ?base=, and the derivation is the same.
Quote USD without a subscription.
The open endpoint needs no key. A key opens with a 5,000-request signup bonus and reaches every stored reading by date.