How Our API Works 
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iPhone CHow to use our Perl Currency Converter
Converting currencies using our Perl Exchange Rate API is as easy as posting a HTTP request. Your requests would need to follow
this simple pattern:
http://www.exchangerate-api.com/FROM_CURRENCY/TO_CURRENCY/AMOUNT?k=YOUR_API_KEY
Here are some examples in Perl:
1. Simple Currency Conversion (in Perl):
To convert from 12.50 USD (US Dollar) to GBP (British Pound):
#!/usr/bin/perl
use LWP 5.64;
$browser = LWP::UserAgent->new;
$from = "usd";
$to = "gbp";
$amount = 12.50;
$response = $browser->get('http://www.exchangerate-api.com/'.$from.'/'.$to.'/'.$amount.'?k=API_KEY');
print $response->content;
use LWP 5.64;
$browser = LWP::UserAgent->new;
$from = "usd";
$to = "gbp";
$amount = 12.50;
$response = $browser->get('http://www.exchangerate-api.com/'.$from.'/'.$to.'/'.$amount.'?k=API_KEY');
print $response->content;
Or to get how many Japanese Yen (JPY) there are to the South African Rand (ZAR):
#!/usr/bin/perl
use LWP 5.64;
$browser = LWP::UserAgent->new;
$response = $browser->get('http://www.exchangerate-api.com/zar/jpy/?k=API_KEY');
print $response->content;
use LWP 5.64;
$browser = LWP::UserAgent->new;
$response = $browser->get('http://www.exchangerate-api.com/zar/jpy/?k=API_KEY');
print $response->content;
Error Codes:
The API returns the following error codes:-1 if an invalid amount is used (must be numeric floating point or integer numbers)
-2 if either of the 3 letter currency codes are invalid (Check our supported currencies)
-3 if an invalid key is used (Get an API key)
-4 if your monthly API query limit is reached (Click here for extended usage)
-5 if an unresolvable IP address is provided (This only applies for our "Automatic Country/Flag Information" query.)
We also offer two additional types of query:
2. Automatic Currency Detection/Conversion (in Perl):
To convert from 12.50 USD (US Dollar) to your user's currency:
#!/usr/bin/perl
use LWP 5.64;
$browser = LWP::UserAgent->new;
$ip = $ENV{'REMOTE_ADDR'};
$url = 'http://www.exchangerate-api.com/auto/USD/'.$ip.'/12.50'?k=API_KEY'; $response = $browser->get($url);
$result = $response->content;
@result_array = split('\|', $result);
$converted_amount = $result_array[0];
$symbol_unicode = $result_array[1];
$currency_code = $result_array[2];
print $converted_amount; #FINAL CONVERTED AMOUNT
print $currency_code; #FINAL 3-DIGIT CURRENCY CODE (EG: USD)
#If you want to display the currency's symbol in HTML:
$symbol_html = "";
@symbol_characters = split(',', $symbol_unicode);
foreach $symbol_characters(@symbol_characters) {
$symbol_html = $symbol_html."&#".$symbol_characters.";";
}
print $symbol_html; #FINAL SYMBOL HTML (EG: $)
use LWP 5.64;
$browser = LWP::UserAgent->new;
$ip = $ENV{'REMOTE_ADDR'};
$url = 'http://www.exchangerate-api.com/auto/USD/'.$ip.'/12.50'?k=API_KEY'; $response = $browser->get($url);
$result = $response->content;
@result_array = split('\|', $result);
$converted_amount = $result_array[0];
$symbol_unicode = $result_array[1];
$currency_code = $result_array[2];
print $converted_amount; #FINAL CONVERTED AMOUNT
print $currency_code; #FINAL 3-DIGIT CURRENCY CODE (EG: USD)
#If you want to display the currency's symbol in HTML:
$symbol_html = "";
@symbol_characters = split(',', $symbol_unicode);
foreach $symbol_characters(@symbol_characters) {
$symbol_html = $symbol_html."&#".$symbol_characters.";";
}
print $symbol_html; #FINAL SYMBOL HTML (EG: $)
3. Automatic Country/Flag Information (in Perl):
To retrieve your user's national flag and other country information:
#!/usr/bin/perl
use LWP 5.64;
$browser = LWP::UserAgent->new;
$ip = $ENV{'REMOTE_ADDR'};
$url = 'http://www.exchangerate-api.com/country_info/'.$ip.'?k=API_KEY'; $response = $browser->get($url);
$result = $response->content;
@result_array = split('\|', $result);
$country_name = $result_array[0];
$country_code_2 = $result_array[1];
$country_code_3 = $result_array[2];
$currency_code = $result_array[3];
$symbol_unicode = $result_array[4];
$flag_url = $result_array[5];
print $country_name; #FINAL COUNTRY NAME
print $country_code_2; #FINAL 2-DIGIT COUNTRY CODE (EG: US)
print $country_code_3; #FINAL 3-DIGIT COUNTRY CODE (EG: USA)
print $currency_code; #FINAL 3-DIGIT CURRENCY CODE (EG: USD)
#If you want to display the currency's symbol in HTML:
$symbol_html = "";
@symbol_characters = split(',', $symbol_unicode);
foreach $symbol_characters(@symbol_characters) {
$symbol_html = $symbol_html."&#".$symbol_characters.";";
}
print $symbol_html; #FINAL SYMBOL HTML (EG: $)
#If you want to display an image of the flag in HTML:
$flag_image = "<img src='".$flag_url."' />";
print $flag_image; #FINAL FLAG IMAGE
use LWP 5.64;
$browser = LWP::UserAgent->new;
$ip = $ENV{'REMOTE_ADDR'};
$url = 'http://www.exchangerate-api.com/country_info/'.$ip.'?k=API_KEY'; $response = $browser->get($url);
$result = $response->content;
@result_array = split('\|', $result);
$country_name = $result_array[0];
$country_code_2 = $result_array[1];
$country_code_3 = $result_array[2];
$currency_code = $result_array[3];
$symbol_unicode = $result_array[4];
$flag_url = $result_array[5];
print $country_name; #FINAL COUNTRY NAME
print $country_code_2; #FINAL 2-DIGIT COUNTRY CODE (EG: US)
print $country_code_3; #FINAL 3-DIGIT COUNTRY CODE (EG: USA)
print $currency_code; #FINAL 3-DIGIT CURRENCY CODE (EG: USD)
#If you want to display the currency's symbol in HTML:
$symbol_html = "";
@symbol_characters = split(',', $symbol_unicode);
foreach $symbol_characters(@symbol_characters) {
$symbol_html = $symbol_html."&#".$symbol_characters.";";
}
print $symbol_html; #FINAL SYMBOL HTML (EG: $)
#If you want to display an image of the flag in HTML:
$flag_image = "<img src='".$flag_url."' />";
print $flag_image; #FINAL FLAG IMAGE