bladx,
I've got a suggestion or two for you:

1. oanda doesn't like lowercase currency abbreviations. To be on the safe side, I'd do a uc on $cf and $ct.
2. If someone tries this out, and they're behind a firewall (like me), it's not going to work. For those behind firewalls, I offer the following:

#!/usr/local/bin/perl -w
use strict;

use LWP::UserAgent;
use HTTP::Request::Common;

my ($amount,$cf,$ct) = @ARGV[0..2];

my $request = GET "http://www.oanda.com/converter/classic?value="
                  . "$amount&exch=" . uc($cf) . "&expr=" . uc($ct);
$request->proxy_authorization_basic('username','password');

(my $ua = (new LWP::UserAgent))->proxy('http','http://yourproxyhere.co
+m:1080');
my $resp = $ua->request($request);

die $resp->status_line if ($resp->is_error());
$_ = $resp->{_content};
s/^.*<!-- conversion result starts//s;
s/<!-- conversion result ends.*$//s;
s/<[^>]+>//g; s/[ \n]+/ /gs;
print $_, "\n"
[download]

You'll need to change username and password to your username/password for the proxy server. If you don't need to authenticate yourself, you can just skip the proxy_authorization_basic. You'll also need to change http://yourproxyhere.com:1080 to the name/port of your proxy server.
I believe the original currency converter was in the article Five Quick Hacks: Downloading Web Pages, in TPJ #13, by Jon Orwant and Dan Gruhl. The modified code above is based on Downloading Web Pages Through A Proxy Server in TPJ #14, by, um, me.
Happy converting (within the bounds of the Terms of Use pointed out by myocom)!

- robsv

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