The exchange rate API here reads Frankfurter, a keyless service over the European Central Bank's published reference rates, and returns one typed row per target currency — the currency code, the rate from your base currency, the base itself and the reference date the rate belongs to.
It is deliberately narrow and honest about its source: these are the ECB's daily reference rates, not a live trading feed, so they update once per business day and suit accounting, reporting and back-testing rather than execution. You choose the base currency and, optionally, the exact target currencies; pass a date to get a historical day instead of the latest. No key on the source, and none on our side beyond your QuantumProxies key.
$0.0002 per delivered rate, up to 50 rates per run. Nothing delivered means nothing charged.
Each run returns the rate table for one base currency on one date. Set base, optionally list the symbols you want, and optionally a date for history; you get one row per currency.
date (YYYY-MM-DD) returns that day's fix; omit it for the latest published rates.All inputs are optional. base defaults to USD; symbols restricts output to the currencies you list (leave empty for every available currency); date switches to a historical day. max_results caps delivery at 50 currencies, and you pay only for currencies returned.
One row per target currency. currency is the code, rate is the conversion from base to that currency, and date is the ECB reference date the rate is fixed to. The row is intentionally small — this is a clean numeric join key for other data, not a market-data terminal.
$0.0002 per delivered rate ($0.20 per 1,000). Nothing delivered means nothing charged, and the $2 monthly free credit covers roughly 10,000 rates here. Volume tiers take up to 30% off.
$0.0002 per delivered rate — $0.20 per 1,000 — the cheapest unit in the catalogue, with no subscription. The $2/month free allowance is about 10,000 rates with no card.
Because a full latest-rates pull is only a few dozen currencies, most users spend a rounding error here; the price matters when you back-fill years of daily history across many currencies. It pairs with the LEI API when a finance dataset needs both FX and entity identifiers.
Frankfurter is free, keyless and already easy to call, and the ECB publishes the rates openly — so for a single conversion, go straight to the source. There is no access advantage to buy here.
The collector exists so FX rates arrive in the same typed, one-row-per-currency shape as the rest of your pipeline, on the same key, with the same billing and rate-limit model. If you are already pulling companies, papers or packages through QuantumProxies, adding rates without standing up another client and another auth is the whole convenience. Commercial FX APIs that do charge and do gate behind keys are the thing this quietly avoids.
Honestly, for latest rates the DIY version is almost nothing — one request and a small parse. The collector only starts to earn its keep when you are back-filling historical series: many dates, many currencies, paginated and normalised into rows, which is a loop and a rate-limit handler you would otherwise write and own.
If you want to keep that loop, put our residential proxies under a heavy historical back-fill so the volume does not lean on a single IP.
Pull the latest ECB fix for your reporting currencies each morning and stamp invoices and ledgers with a defensible, dated rate.
Iterate date across a range to build a daily rate series per currency for back-testing or restating past figures at the rate that actually applied.
Use the rate table as a join key to convert prices collected in local currencies — from marketplace or store collectors — into one comparison currency.
One run delivers up to 50 currencies for one base and one date. These are ECB reference rates: published once per business day, with no weekend or holiday fix, so a weekend date returns the previous business day's numbers. This is not a real-time or execution-grade feed. Runs parallelise up to your plan's rate limit (60–1,200 requests/minute by tier).
ECB reference data is public. Nothing here is financial advice or a dealing rate.
The Frankfurter/ECB source is free and keyless, so call it directly for a single conversion. This collector puts it on one key and schema with your other data and carries a $2/month free allowance — about 10,000 rates — with no card.
Yes. The source needs no key, and on our side you use only your QuantumProxies key. There is no separate FX-provider signup, token or usage dashboard to maintain.
Yes. Pass a date as YYYY-MM-DD to get that day's ECB reference fix; omit it for the latest. Iterate the date to assemble a daily historical series per currency.
No. They are the ECB's daily reference rates via Frankfurter — one fix per business day, meant for reporting, accounting and back-testing, not for real-time trading or execution pricing.