# Using VRF

To access our VRF service, you must subscribe using KDEV tokens, the Bitkub Chain developer utility token. Subscribing with KDEV tokens provides a cost-effective and efficient way to leverage the benefits of off-chain data in your smart contracts.

**Subscription Process:** To subscribe to our Data Feed service, follow these simple steps:

1. Acquire KDEV tokens through the Bitkub chain [developer console](https://console.bitkubchain.com/get-kdev).
2. Visit our website, connect your wallet, and navigate to the *Services > VRF* menu.
3. Click *Create new subscription* button.
4. Review the information and click *Create subscription* button.
5. Add funds to the subscription.
6. Deploy your VRF consumer contract with the required information. ([example contract](/examples/vrf-consumer.md))
7. Add the VRF consumer contract address to the subscription.


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# Agent Instructions: 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.bkcoracle.com/how-to/using-vrf.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.