<s>
Grams	B-Protocol
is	O
a	O
discontinued	O
search	B-Application
engine	I-Application
for	O
Tor	B-Application
based	O
darknet	O
markets	O
launched	O
in	O
April	O
2014	O
,	O
and	O
closed	O
in	O
December	O
2017	O
.	O
</s>
<s>
The	O
services	O
used	O
a	O
custom	O
API	B-General_Concept
to	O
scrape	B-Application
listings	O
from	O
several	O
markets	O
such	O
as	O
Alpha	O
Bay	O
and	O
others	O
,	O
to	O
return	O
search	O
listings	O
.	O
</s>
<s>
In	O
May	O
2014	O
the	O
site	O
added	O
Gramwords	O
,	O
a	O
service	O
similar	O
to	O
Google	B-Application
's	I-Application
AdWords	B-Application
search	O
sponsorship	O
system	O
for	O
vendors	O
.	O
</s>
<s>
Later	O
that	O
year	O
in	O
June	O
the	O
creators	O
released	O
Grams	B-Protocol
Flow	O
,	O
a	O
clearnet	O
to	O
Tor	B-Application
redirection	O
service	O
serving	O
various	O
dark	O
net	O
sites	O
and	O
in	O
November	O
,	O
a	O
banner	O
advertising	O
network	O
for	O
Tor	B-Application
sites	O
,	O
TorAds	B-Protocol
which	O
has	O
not	O
yet	O
had	O
much	O
success	O
.	O
</s>
<s>
On	O
December	O
9	O
,	O
2017	O
,	O
the	O
Grams	B-Protocol
administrator	O
left	O
a	O
PGP	O
signed	O
message	O
on	O
the	O
Reddit	O
subreddit	O
r/Grams	O
stating	O
that	O
all	O
Grams	B-Protocol
services	O
,	O
including	O
the	O
Helix	O
tumbler	O
,	O
would	O
be	O
shut	O
down	O
on	O
December	O
16	O
,	O
2017	O
.	O
</s>
<s>
In	O
June	O
2014	O
,	O
Grams	B-Protocol
released	O
Helix	O
and	O
Helix	O
Light	O
,	O
a	O
market	O
payment	O
service	O
with	O
an	O
integrated	O
bitcoin	O
tumbler	O
.	O
</s>
<s>
The	O
site	O
was	O
also	O
available	O
on	O
the	O
clearnet	O
via	O
Grams	B-Protocol
Flow	O
.	O
</s>
<s>
In	O
August	O
2017	O
,	O
it	O
was	O
noted	O
that	O
an	O
elaborate	O
darknet	O
phishing	O
scam	O
appeared	O
as	O
the	O
top	O
Google	B-Application
search	O
result	O
for	O
"	O
how	O
to	O
mix	O
bitcoins	O
"	O
,	O
directing	O
users	O
to	O
a	O
fake	O
version	O
of	O
the	O
Grams	B-Protocol
Helix	O
Light	O
website	O
that	O
would	O
steal	O
their	O
bitcoins	O
.	O
</s>
<s>
These	O
include	O
a	O
scam	O
version	O
of	O
flow	O
,	O
the	O
search	B-Application
engine	I-Application
,	O
and	O
even	O
copies	O
of	O
the	O
drug	O
marketplaces	O
indexed	O
.	O
</s>
<s>
On	O
February	O
6	O
,	O
2020	O
,	O
the	O
FBI	O
and	O
IRS	O
arrested	O
an	O
Ohio	O
man	O
,	O
Larry	O
Dean	O
Harmon	O
,	O
who	O
they	O
alleged	O
was	O
the	O
operator	O
of	O
Helix	O
and	O
Grams	B-Protocol
.	O
</s>
