You can make $13,000 a year by donating your poop

If you've got good digestive health, you could be making an easy $13,000 a year.

People infected with the bacteria C. difficile need fecal transplants to help their gut. Without constant antibiotics, sufferers may undergo "extreme gastrointestinal distress" and may even become housebound, The Washington Post reports. To help these patients, a company called OpenBiome delivers frozen stool transplants to those in need.

The healthy fecal transplants can be transferred to those with the C. difficile bacteria through endoscopy, nasal tubes, or swallowed capsules. According to the Post, OpenBiome has already shipped roughly 2,000 treatments to 185 hospitals nationwide. And it pays: Donors get $40 per sample, with an extra $50 for those who come in five days a week. So for a year's worth of donations, you could be looking at $13,000.

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Don't get too excited, though: The donations have to be made on-site in Medford, Massachusetts, and only about four percent of prospective donors pass the "extensive medical questioning and stool testing," the Post notes. But if you make the cut, you'll be helping others in addition to making some fast cash.

"Everyone thinks it's great that they're making money doing such an easy thing," OpenBiome co-founder Carolyn Edelstein told the Post. "But they also love to hear us say, 'Look, your poop just helped this lady who's been sick for nine years go to her daughter's graduation.'"