# CalcFX (calcfx.xyz)

> Live currency exchange rates and a triangular arbitrage (triangular FX) calculator.
> No signup, no API key, free. Data from open public rate APIs, refreshed every 30 minutes.

## Site map
- /         : Currency converter (default, zh-CN)
- /en/      : Currency converter (English)
- /es/ /fr/ /de/ /ja/ /ko/ /pt/ : same site in Spanish, French, German, Japanese, Korean, Portuguese
- /triangular/ : Triangular FX arbitrage calculator + cross-source opportunity scan
- /rates/   : Full currency table (200+ currencies)
- /pair/{FROM}-to-{TO}/ : Pair detail pages with converter, inverse table, 30-day trend
- /guide/   : How-to guides (exchange rates, cross rates, triangular arbitrage)
- /faq/     : Frequently asked questions
- /about/ /privacy/ /terms/ : Site policies

## Machine-readable data
- GET /api/rates : all live rates (base USD), currency metadata, source + timestamp
- GET /api/convert?from=USD&to=CNY&amount=100
- GET /api/triangular?a=USD&b=EUR&c=CNY&amount=1000&feeBps=50 : full arbitrage analysis
- GET /api/triangular/scan?base=USD&feeBps=50 : ranked cross-source arbitrage loops
- GET /api/history?from=USD&to=CNY&days=30 : historical daily series
- https://calcfx.xyz/fx-fallback.json : static rates snapshot (CDN-cached)

## Key facts
- Snapshot date: 2026-11-05 (3 aggregated public quote feeds, 338 currencies)
- All page rates are "units of quote currency per 1 base currency".
- Triangular arbitrage math: product of the three legs (A->B, B->C, C->A).
  Product > 1 before fees => theoretical profit. Each trade costs a fee; the tool takes feeBps per trade.

## Popular exchange rates (1 base unit)
| Pair | Rate | Meaning |
|---|---|---|
| USD - CNY | 6.6693 | US Dollar to Chinese Yuan |
| EUR - USD | 1.1261 | Euro to US Dollar |
| USD - JPY | 157.897 | US Dollar to Japanese Yen |
| GBP - USD | 1.349 | British Pound to US Dollar |
| USD - HKD | 7.8442 | US Dollar to Hong Kong Dollar |
| USD - KRW | 1342.96 | US Dollar to South Korean Won |
| EUR - CNY | 7.5103 | Euro to Chinese Yuan |
| USD - SGD | 1.2764 | US Dollar to Singapore Dollar |
| AUD - USD | 0.7009 | Australian Dollar to US Dollar |
| USD - CAD | 1.3952 | US Dollar to Canadian Dollar |
| USD - CHF | 0.8144 | US Dollar to Swiss Franc |
| CNY - JPY | 23.6751 | Chinese Yuan to Japanese Yen |
| USD - THB | 33.4491 | US Dollar to Thai Baht |
| USD - INR | 94.5287 | US Dollar to Indian Rupee |
| USD - IDR | 18099.65 | US Dollar to Indonesian Rupiah |
| EUR - GBP | 0.8348 | Euro to British Pound |

## Currencies covered
Fiat: 338+ codes including USD EUR CNY JPY GBP HKD KRW SGD AUD CAD CHF NZD TWD THB MYR INR IDR VND PHP AED.
Crypto (via primary source): BTC ETH USDT USDC BNB XRP SOL ADA DOGE.

## Content policy
- Rates are indicative mid-market data for information only, not trading advice.
- For deals/broker quotes, always confirm with your institution before transacting.