With the Cred plugin for WordPress you will be able to monetize your site either through micropayments or through subscriptions to your content.
Any content (as long as it is legal) can be sold through our payment method and all you need is to install the plugin, signup as a content provider to receive an API key and start earning. You can sell text, audio, video and any file format you might want. All sites hooked up through the Cred system use one payment system and currency meaning your potential customers will not need to signup to every WordPress paywall site and rather be able to purchase from multiple sites with one account.
Plugin homepage: www.yourcred.com/plugins/wordpress