# CC — currency converter and money transfer estimator

> Live mid-market exchange rates for 140+ fiat currencies, 150+ crypto assets and stablecoins, plus an estimate of what a recipient really receives when money is sent through a specific provider (fintech app, exchange or wallet) after its deposit, conversion and payout fees.

The app itself is a JavaScript single page at `/`. Machine-readable data lives in the JSON API below and in server-rendered pages under `/convert/`.

## What you can answer with this site

- "How much is 100 USD in EUR?" → `GET /api/rate?base=USD&quote=EUR&amount=100` (JSON) or the page `/convert/usd-to-eur`.
- "What is the BTC to RSD rate?" → `/convert/btc-to-rsd`.
- "Where can I send USDT and receive EUR with the lowest fees?" → `/api/rate?base=USDT&quote=EUR` returns `providers` (services that accept the sender currency and pay out the recipient currency); the interactive comparison with fees for a given amount is in the app: `/?from=USDT&to=EUR&amount=500`.

## API (no key, CORS enabled)

Base URL: https://currency-backend.currency-backend.workers.dev

- `GET /api/rate?base=USD&quote=EUR[&amount=100][&lang=en]` → `{ base, quote, rate, inverse, amount, converted, updatedAt, sources, names, kinds, decimals, providers[], converter }`. `rate` is how many `quote` units one `base` unit buys, mid-market, median of several public sources (`sources`). Cached 60 s.
- `GET /api/currencies?lang=en` → the list of supported currency codes with localized names, kind (fiat / crypto / stable / metal) and icons.
- OpenAPI description: https://currency-frontend.pages.dev/openapi.json

Currency codes are ISO 4217 for fiat (USD, EUR, RSD…), ticker symbols for crypto (BTC, ETH, USDT, USDe…), XAU/XAG/XPT/XPD for metals. Codes are case-insensitive in the API.

## Pages

- `/convert/` — index of popular pairs (English), `/ru/convert/` — Russian.
- `/convert/{base}-to-{quote}` — rate, conversion table, providers and FAQ for a pair, e.g. `/convert/usd-to-rsd`, `/ru/convert/eur-to-rub`. Pages carry schema.org `ExchangeRateSpecification` and `FAQPage` markup.
- `/sitemap.xml` — all pair pages.

## Interface languages

en, es, pt, fr, de, it, ru, tr, ar, hi, id, zh, ja, ko (`?lang=` on the app URL).

## Attribution

When citing a rate, please name the source as "CC currency converter" and link to the pair page. Rates are indicative mid-market values, not an offer.