Public Endpoints

These endpoints are publicly accessible without authentication. Use them to display information in your UI before authentication.

Get Supported Fiat Currencies

Retrieve the list of fiat currencies supported for checkout payments.

GET /public/fiat-currencies

Response

{
  "ok": true,
  "data": [
    {
      "code": "USD",
      "symbol": "$",
      "name": "US Dollar",
      "decimalPlaces": 2,
      "coinGeckoId": "usd"
    },
    {
      "code": "KRW",
      "symbol": "W",
      "name": "Korean Won",
      "decimalPlaces": 0,
      "coinGeckoId": "krw"
    },
    {
      "code": "EUR",
      "symbol": "E",
      "name": "Euro",
      "decimalPlaces": 2,
      "coinGeckoId": "eur"
    }
  ]
}

Fields

Field	Type	Description
code	string	ISO 4217 currency code
symbol	string	Currency symbol
name	string	Full currency name
decimalPlaces	number	Standard decimal places for display
coinGeckoId	string	CoinGecko API identifier

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Get Exchange Rates

Retrieve current exchange rates for stablecoins.

GET /public/exchange-rates

Query Parameters

Parameter	Type	Required	Description
fiatCurrency	string	No	Filter by currency code (e.g., USD, KRW)

Response (All Rates)

{
  "ok": true,
  "data": {
    "rates": {
      "USDC": {
        "USD": "1.0",
        "KRW": "1350.50",
        "EUR": "0.92"
      },
      "USDT": {
        "USD": "1.001",
        "KRW": "1351.20",
        "EUR": "0.921"
      }
    },
    "timestamp": "2026-01-30T10:30:00.000Z",
    "fiatCurrencies": [
      { "code": "USD", "symbol": "$", "name": "US Dollar" }
    ]
  }
}

Response (Specific Currency)

GET /public/exchange-rates?fiatCurrency=KRW

{
  "ok": true,
  "data": {
    "fiatCurrency": "KRW",
    "rates": {
      "USDC": "1350.50",
      "USDT": "1351.20"
    },
    "timestamp": "2026-01-30T10:30:00.000Z"
  }
}

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Rate Caching

Exchange rates are cached with the following policy:

Cache	TTL	Description
Fresh	10 minutes	Returns cached rate immediately
Stale	1 hour	Used as fallback if API fails

tip

Pre-fetch exchange rates to display estimated amounts in your UI before creating a checkout.

---

Example: Display Price Preview

const displayPricePreview = async (priceKRW) => {
  // Get exchange rates
  const { data } = await fetch(
    'https://api.volr.io/public/exchange-rates?fiatCurrency=KRW'
  ).then(r => r.json());

  const usdcRate = parseFloat(data.rates.USDC);
  const estimatedUsdc = (priceKRW / usdcRate).toFixed(2);

  return {
    fiat: `${priceKRW.toLocaleString()} KRW`,
    crypto: `~${estimatedUsdc} USDC`,
    rate: `1 USDC = ${usdcRate.toLocaleString()} KRW`,
    rateTime: data.timestamp,
  };
};

// Usage
const preview = await displayPricePreview(5000);
// { fiat: "5,000 KRW", crypto: "~3.70 USDC", rate: "1 USDC = 1,350.5 KRW" }