{source}/{target}/{format}?quantity={quantity}&key={YOUR_KEY}
| Property | Type | Description |
| source | string(3) | The currency source code (3 letters) |
| target | string(3) | The currency target code (3 letters) |
| format | string(3) | json, xml or jsonp |
| quantity | string(3) | The amount your want to convert |
| key | string(128) | Your free API key |