| Resource | Purpose | URL |
|---|---|---|
| CoinMarketCap Bitcoin Historical Data | Historical BTC pricing | Visit Website |
| Investing.com Bitcoin Historical Data | Historical BTC price lookup | Visit Website |
| Macrotrends Bitcoin History | Long-term Bitcoin charts | Visit Website |
| European Central Bank Exchange Rates | EUR historical FX reference | Visit Website |
| Reserve Bank of Australia Exchange Rates | AUD historical FX reference | Visit Website |