$BTC Types of BTC Trading Pairs**

1. **Crypto-to-Crypto Pairs**:

- **BTC/ETH**, **BTC/LTC**, **BTC/ADA** (common altcoin pairs) .

- Early exchanges only offered crypto pairs, making BTC the primary base currency .

2. **Fiat-to-Crypto Pairs**:

- **BTC/USD**, **BTC/EUR**: Allow direct fiat purchases of BTC .

3. **Stablecoin Pairs**:

- **BTC/USDT**, **BTC/DAI**: Pegged to fiat (e.g., USD) to reduce volatility .

*Popular BTC Pairs**

| Pair | Description |

|---------------|--------------------------------------|

| **BTC/USDT** | Most traded pair (Tether stablecoin).|

| **BTC/ETH** | Dominant crypto-to-crypto pair. |

| **BTC/USD** | Direct fiat trading on major exchanges.|