Grams was a search engine for Tor based darknet markets launched in April 2014, and closed in December 2017. The service allowed users to search multiple markets for products like drugs and guns from a simple search interface, and also provided the capability for its users to hide their transactions through its bitcoin tumbler Helix.
The services used a custom API to scrape listings from several markets such as Alpha Bay and others, to return search listings. The site is described by the Global Drug Policy Observatory to have "transformed how people search the hidden web".
In May 2014 the site added Gramwords, a service similar to Google's AdWords search sponsorship system for vendors. Additionally their profile system allows for cross-market vendor contact details and reviews to be held centrally.
Later that year in June the creators released Grams Flow, a clearnet to Tor redirection service serving various dark net sites and in November, a banner advertising network for Tor sites, TorAds which has not yet had much success.
'InfoDesk' allows central content and identity management for vendors, reducing the complexity of around maintaining presences on multiple markets.
On December 9th, 2017 the Grams administrator left a PGP signed message on the Reddit subreddit /r/DarkNetMarkets stating that all Grams services, including the Helix tumbler, will be shut down on December 16th, 2017. 
In June 2014, Grams released Helix and Helix Light, a market payment service with an integrated bitcoin tumbler. Before the coins are mixed they are also traded out for new ones. The site is also available on the clearnet via Grams Flow.
In August 2017, it was noted that an elaborate darknet phishing scam appeared as the top Google search result for "how to mix bitcoins", directing users to a fake version of the Grams Helix Light website that would steal their bitcoins.
- ^ "Grams marketplace listing". DeepDotWeb. Retrieved 2017-09-01.
- ^ "Grams listing". DNStats. Retrieved 2017-09-01.
- ^ Zetter, Kim (17 April 2014). "New 'Google' for the Dark Web Makes Buying Dope and Guns Easy". Wired. Archived from the original on 25 July 2016.
- ^ Neal, Meghan (17 April 2014). "I Used the Dark Net's First Search Engine to Look for Drugs". Vice Motherboard. Retrieved 1 September 2017.
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- ^ C. Aliens. "The Darknet Search Engine 'Grams' is Shutting Down". DeepDotWeb. Retrieved 2018-01-23.
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- ^ Cox, Joseph (21 April 2015). "Banner Ads Don't Work on the Dark Web". Vice Motherboard. Retrieved 3 August 2015.
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- ^ "So Long, and Thanks for All the Fish". 9 December 2017. Retrieved 9 December 2017.
- ^ a b "Introducing Grams Helix: Bitcoins Cleaner". DeepDotWeb. 22 June 2014. Retrieved 10 June 2015.
- ^ "Helix Updates: Integrated Markets Can Now Helix Your BTC". DeepDotWeb. August 5, 2014. Retrieved 30 May 2015.
- ^ White, Mike. "Deep Web Bitcoin Mixer's Recent Hack Restarted The Debate Of Darkcoin Vs Trusted Mixers and Trusted Mixers Won". CoinBrief. Retrieved 9 June 2015.
- ^ Pearson, Jordan (31 August 2017). "An Elaborate Darknet Phishing Scam Is the Top Google Result for Basic Bitcoin Tutorials". Vice Motherboard. Retrieved 31 August 2017.
- ^ Jotham, Immanuel (31 August 2017). "Popular Darknet Markets tutorial on bitcoin mixing is a dubious phishing scam". International Business Times. Archived from the original on 1 September 2017. Retrieved 31 August 2017.