> For the complete documentation index, see [llms.txt](https://docs.frequencychain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.frequencychain.org/3.-network-configuration/3.3-understanding-rpc-endpoints.md).

# 3.3 Understanding RPC Endpoints

An RPC (Remote Procedure Call) endpoint is the primary interface through which applications communicate with the blockchain.

When a developer deploys a smart contract, sends a transaction or queries blockchain data, the request is sent through an RPC endpoint to a node in the network.

FreCx provides public RPC endpoints for both testnet and mainnet environments.

For the mainnet:

* <sup>RPC URL:</sup> [<sup>https://rpc.frequencychain.org</sup>](https://rpc.frequencychain.org/)
* <sup>***Chain ID: 5296290***</sup>

For the testnet:

* <sup>RPC URL:</sup> [<sup>https://testrpc.frequencychain.org</sup>](https://testrpc.frequencychain.org/)
* <sup>***Chain ID: 5296291***</sup>

These endpoints enable developers to connect their applications, tools, and wallets directly to the FreCx network.

<figure><img src="https://1067227230-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLwgYv3BMBEDsxgxyrgOJ%2Fuploads%2FjswDouCrEnPb7sNkZTjT%2FUnderstanding%20RPC%20Endpoints.jpg?alt=media&amp;token=a0cccde2-adbd-4876-b632-3b501f7ec46d" alt=""><figcaption></figcaption></figure>


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