Centralized database for uptodate rates?

PHP currency conversion

[humandesigner]

Hello,

I have a shopping cart I had built on my own and I'd like to know if there is any way I could implement a system that would switch the whole website from one currency to another.

The whole thing is programmed in PHP and I would need to connect to some centralized database containing uptodate rates.

I don't know were to start because I know nothing about currency conversion.

One thing for sure : I want to avoid systems where users have to do the conversions by themselves for each price.

In case I have no choice but to create my own database, how often are the rates supposed to change?

Thanks for helping! ;)

[philbish]

Yo! I am using osCommerce and there's a mod that connects to the xe.com currency database. I just have like 4 currencies people can choose from. Every other day or so I will run the program that queries the xe.com rates, and then stores them to my database. The currency converter on my site goes to the rates in the database and not live to the xe site.

Good luck

[humandesigner]

Hello,

I've visited the XE website but can't find any information about such a service.

And I'm not using OScommerce anyway.
Could you help?