Ribbon was a San Francisco payments startup that lets users sell online using a shortened URL that can be shared across email, social media and a seller's own website.

The company graduated from a startup accelerator called AngelPad as "Kout" in October 2011[5] and subsequently raised $1.6 million from Tim Draper through Draper Associates, Naguib Sawiris, Emil Michael, Gokul Rajaram, and others bringing its total raised amount to $1.75 million.

[6] On April 10, 2013, the company announced support for "in-stream" payments on Twitter, allowing buyers to purchase items without leaving the Twitter.com stream.

Twitter shut down Ribbon's API access after approximately an hour and a half, according to Head of Business Development, Daniel Brusilovsky.

[8] The company wrote a statement announcing they will revert to showcasing only a summary of their product without the ability to do in-stream payments.