Beeing paid to read is one of the many kinds of methods to earn money on the intenet doing something pre-defined in websites.

In PTR sites (paid to read) we are paid to click and see advertisements during a pre-determined time period. Almost every PTR sites are PTS sites (paid to search).

See here the best PTRs in the market.

In PTR sites we create a personal account which is credited when we see an advertisement.
When our account reaches the minimum value to request a payment (the payout value) we can request it. In the majority of the sites we have to wait that administrator do the payment manually. In PTR business there isn't (at least i don't know) sites with instant payments, but some of them do automatic and random payouts.
In automatic payments we are paid automaticatic (or at some day of the week) if our account reach the payout value. In random payments the administrator does random payments to some accounts even if they haven't reached the payout value.

While we are seeing the advertisement we can do another things in the computer. We only cannot close the advertisement window before our account be credited.

Usually we can only see one advertisement at a time from each PTR site, however, we can be seeing advertisements from other PTR sites.

In PTR sites you can also earn money from your downline.

There are hundreds of PTR sites however some of them are not sustainable and after some time they stop paying the users. When this happens we say that the site is SCAM. For this reason I only show you the most reliable PTR sites.

However due to their nature the PTR sites are less susceptible to turn in a scam than PTC. In any case if you want register in a site you should investigate his history on foruns and never believe in sites that pay more than 1 cent in each advertisement.

There is a important concept that you need to know in PTR and PTS business: the search and the valid search.
Usually most of advertisements in PTR sites are links to search engine portals.
The owner of the PTR site earn money (used to pay us) if we do valid searches in the search portals. If we don't do the searches the owner of the PTR site doesn't earn money and at long term he loses money and his site is in risk (and our earnings).
In your account you can choose if you want receive search's advertisements. If you choose it you should do the searches because if you don't do it you are causing losses to the site and to the other users. If you don't want do searches don't check that option in your profile page.

In a search portal there is a search box and several keywords.
When we search anything using the search box or we click in a keyword a search is done.
However the owner earns money only when the search is valid. A search is valid when after doing the search we click in one of the links resulted from the search and wait to full download of the advertiser webpage.

PTR sites, specially if used with searches costs us more work and gives us less money than regular PTC sites.
However PTR sites are more reliable than PTC sites. If you want a secure way to earn money you should choose one of the reliable PTR sites shown below.

These are the best PTR sites in the market: