> For the complete documentation index, see [llms.txt](https://docs.chainrpc.io/chainrpc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chainrpc.io/chainrpc/networks/ethereum/how-to/choose-a-network.md).

# Choose a network

{% hint style="warning" %}
**Deprecation warning**\
\
Rinkeby, Ropsten, and Kovan testnets are deprecated from the chainRPC API.

We recommend users migrate to Goerli to test deployments.
{% endhint %}

Use one of these endpoints as your Ethereum client provider.

Ensure that you replace `YOUR-API-KEY` with an API key from your [chainRPC dashboard](https://chainrpc.io/dashboard).

<table><thead><tr><th width="127.85252043158903">Network</th><th width="250.19198321554614">Description</th><th>URL</th></tr></thead><tbody><tr><td>Mainnet</td><td>JSON-RPC over HTTPS</td><td>https://eth.chainrpc.io/v3/YOUR-API-KEY</td></tr><tr><td>Mainnet</td><td>JSON-RPC over WebSocket</td><td>wss://eth.chainrpc.io/v3/YOUR-API-KEY</td></tr></tbody></table>

{% hint style="danger" %}
Support of the parameters `finalized`/`safe` for the API call `eth_getLogs` are not yet live on Sepolia. This warning will be removed once they are.
{% 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.chainrpc.io/chainrpc/networks/ethereum/how-to/choose-a-network.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.