Google has tripled its maximum reward for finding flaws in its software to $15,000, a figure the company hopes will deter independent researchers from selling their information on shady markets.

The company had paid a minimum of $500 up to $5,000. But it is now becoming more difficult to find bugs in software such as Chrome, and Google wants to reward the extra effort, wrote Tim Willis of Chrome Security Team in a blog post on Tuesday.

Bug bounty programs have proven fruitful for large Web companies such as Google and Facebook, who can attract a greater number of eyes to their software without hiring more security analysts.

But independent researchers have a lot of options for selling vulnerabilities through professional brokers such as Vupen and Netragard to cybercriminals looking for new vulnerabilities they can use to spread malware.

“We understand that our cash reward amounts can be less than these alternatives, but we offer you public acknowledgement of your skills and how awesome you are, a quick fix and an opportunity to openly blog/talk/present on your amazing work,” Willis wrote. “Also, you’ll never have to be concerned that your bugs were used by shady people for unknown purposes.

Willis wrote that Google will pay more than $15,000 for “particularly great reports,” adding that one award topped $30,000 last month. The company has also laid out in more detail exactly what it will pay depending on what is submitted and what type of flaw has been found.

Those researchers who have also developed a working exploit may earn a higher reward as well. Under a new change, researchers can submit the vulnerability report first and then an exploit later.

“We believe that this a win-win situation for security and researchers: we get to patch bugs earlier and our contributors get to lay claim to the bugs sooner, lowering the chances of submitting a duplicate report,” Willis wrote.

Recipients will also be recognized in Google’s Hall of Fame, a public record of successful submissions. Willis wrote that Google will back-pay submissions from July 1 at the new levels.