CurrConv

A real currency converter using live exchange rates from the European Central Bank via the free frankfurter.app API. Convert currencies, check rates, list available currencies, and look up historical exchange rates. No API key required.

Commands

Requirements

• Bash 4+ (set -euo pipefail)
• curl — for API requests
• python3 — for JSON parsing and number formatting
• Internet connection (calls frankfurter.app API)
• No API key required (free, public API)

When to Use

1. Quick currency conversion — currconv convert 100 USD EUR for instant conversion
2. Checking exchange rates — currconv rates USD shows all rates against the dollar
3. Available currencies — currconv list shows all 30+ supported currencies
4. Historical rates — currconv history USD EUR 2024-01-15 with comparison to today's rate
5. Travel planning — Convert amounts between currencies before a trip

Examples

# Convert 100 USD to EUR
currconv convert 100 USD EUR

# Convert 5000 JPY to GBP
currconv convert 5000 JPY GBP

# Convert 1000 CNY to USD
currconv convert 1000 CNY USD

# Show all rates for USD
currconv rates USD

# Show all rates for EUR (default)
currconv rates

# List all available currencies
currconv list

# Get historical rate for a specific date
currconv history USD EUR 2024-01-15

# Historical GBP to JPY rate
currconv history GBP JPY 2023-06-01

Example Output

$ currconv convert 100 USD CNY
┌───────────────────────────────────────────────────┐
│  Currency Conversion                              │
├───────────────────────────────────────────────────┤
│  100.00         USD                                │
│  =                                                 │
│  688.82         CNY                                │
├───────────────────────────────────────────────────┤
│  Rate:  1 USD  = 6.888200   CNY                    │
│  Date:  2026-03-18                                 │
│  Source: European Central Bank                     │
└───────────────────────────────────────────────────┘

$ currconv history USD EUR 2024-01-15
┌───────────────────────────────────────────────────┐
│  Historical Exchange Rate                         │
├───────────────────────────────────────────────────┤
│  Pair:       USD → EUR                             │
│  Date:       2024-01-15                            │
│  Rate:       1 USD  = 0.91234 EUR                  │
├───────────────────────────────────────────────────┤
│  Today:      1 USD  = 0.92150 EUR                  │
│  Change:     +0.009160 (+1.00%)                    │
│  Today date: 2026-03-18                            │
├───────────────────────────────────────────────────┤
│  Source: European Central Bank                     │
└───────────────────────────────────────────────────┘

Supported Currencies

Run currconv list for the full list. Common currencies include:

• USD — US Dollar
• EUR — Euro
• GBP — British Pound
• JPY — Japanese Yen
• CNY — Chinese Yuan
• AUD — Australian Dollar
• CAD — Canadian Dollar
• CHF — Swiss Franc
• KRW — South Korean Won
• SGD — Singapore Dollar

30+ currencies supported in total, all sourced from the European Central Bank.

Data Source

All exchange rates come from the European Central Bank via the free frankfurter.app API. Rates are typically updated once per business day. No API key or registration required.

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Data Storage

Rate cache stored in ~/.local/share/currconv/.