On August 7, 2025, @serpinxbt introduced ethos tech, a replacement for @friendtech built on top of Ethos in less than five hours. Ethos shared it as an example of how extensible the network is: you can build on top of it in a single “vibe coding” session.
For developers, the point is that an existing crypto app could be rebuilt quickly by using Ethos data as the foundation, rather than starting from nothing.
This article describes Ethos as it worked in August 2025. Ethos has changed since.
Ethos tech, built in under five hours
@serpinxbt described ethos tech as a “100% vibe coded replacement” for friend.tech, created in less than five hours. It was built on top of Ethos reputation markets holdings, which @serpinxbt explained as trust or distrust in a user’s reputation.
@serpinxbt also came away with a view on the app being replaced: “somehow friend tech was even MORE low tech than I thought.”
Ethos quoted the post the same day:
ethos is so extensible ... you can just.. build @friendtech on top of it in a 5hr vibe coding session
Ethos pointed builders to its developer site at developers.ethos.network.
The full demo of ethos.foo
On August 13, 2025, @serpinxbt followed up with a full demo of building ethos.foo, which they called a spin-off of friend.tech based on Ethos markets. In @serpinxbt’s words, it’s a place “where you can short / long reputation.”
@serpinxbt framed the demo around a broader claim:
- Most apps in crypto are easier to build than you think
- Some can be vibe coded in less than a day
Ethos shared the demo with a short line: “you can just build things on top of ethos.”
Why it mattered
Ethos is a network built around reputation. At the time, its reputation markets let people express trust or distrust in a user’s reputation.
The two posts made the same case from a builder’s point of view. Because that reputation data was already there to build on, @serpinxbt could put a familiar app experience on top of it in a matter of hours. Ethos used the example to show that the network wasn’t only something to use directly, but a base other people could build their own apps on.
This story first appeared on X.
