> For the complete documentation index, see [llms.txt](https://eval-engine.gitbook.io/eval-engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eval-engine.gitbook.io/eval-engine/eval-engine.md).

# Eval Engine

### Overview

<figure><img src="/files/M1MJTBUmIXbwJeQd1dzc" alt="" width="188"><figcaption><p>Eval Engine</p></figcaption></figure>

Eval Engine is a decentralized framework for evaluating AI agents with a focus on crypto-native agents.&#x20;

> Built on Chromia blockchain - a gas-free relational blockchain that enables seamless user experience without transaction fees.&#x20;

The system consists of three key components:

1. **Chromia Blockchain**: Acts as a transparent, immutable, gas-free database
2. **Engine**: The evaluation service
3. **Client**: The end user requesting evaluations

### Think of it as a Distinguished Food Critic

<figure><img src="/files/ovi6DfJwUocF6s1q8lpc" alt=""><figcaption><p>Eval Engine is like a Distinguished Food Critic</p></figcaption></figure>

Eval Engine is like a World-Renowned Food Critic. While their evaluation criteria remain private, their final ratings and reviews are public and immutable. Eval Engine works similarly - it processes evaluations through multiple specialized models but records all results transparently on Chromia blockchain. Like a prestigious restaurant rating that can't be bought or manipulated, Eval Engine ensures evaluation integrity through blockchain technology.