> For the complete documentation index, see [llms.txt](https://docs.cyclenetwork.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cyclenetwork.io/developers/connect-to-cycle/connect-to-cycle-testnet/cycle-starfish-archived.md).

# Cycle StarFish (Archived)

## **Introdction:**

StarFish is the first testnet of Cycle launched on Jan 25 2024. The purpose of launching startfish is to verify the Feasibility of Cycle's Multi-Chain Rollup Mechanism in Practical Applications. By now, Starfish has supported many Mainstream Ethereum Ecosystem Networks and Bitcoin Layer 2 Solutions.

## **Network:**

Cycle

| **ChainId** | **chainName**  | **Currency** | **NetworkId** |
| ----------- | -------------- | ------------ | ------------- |
| 1221        | Cycle StarFish | ETH          | 1             |

Security Layer

| **ChainId** | **chainName** | **Currency** | **NetworkId** |
| ----------- | ------------- | ------------ | ------------- |
| 11155111    | Sepolia       | ETH          | 0             |

Extend Layer

| **ChainId** | **chainName**                        | **NetworkId** |
| ----------- | ------------------------------------ | ------------- |
| 97          | BNB Smart Chain Testnet (deprecated) | <p><br></p>   |
| 5611        | opBNB Testnet                        | 6             |
| 421614      | Arbitrum Sepolia                     | 4             |
| 11155420    | op-sepolia                           | 5             |
| 59141       | Linea Sepolia (incoming)             | <p><br></p>   |
| 84532       | Base Sepolia Testnet (incoming)      | <p><br></p>   |
| 80085       | Berachain Artio (incoming)           | <p><br></p>   |
| 11503       | BEVM Testnet                         | 10            |
| 195         | X Layer Testnet                      | 9             |
| 4690        | IoTeX Network Testnet (deprecated)   | <p><br></p>   |
| 80002       | Polygon(Amoy) （deprecated）           | <p><br></p>   |

{% hint style="info" %}
Attention: Testnet is not suitable for long-term data storage as data will be periodically reset.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cyclenetwork.io/developers/connect-to-cycle/connect-to-cycle-testnet/cycle-starfish-archived.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.