# Oracles & VRF

## Available on Mainnet and Testnet

### Redstone

[Redstone](https://redstone.finance) is a modular oracle network that provides secure price feeds for blockchain protocols.

The following price feeds are provided by Redstone on Citrea Mainnet: `BTC/USD`, `USDC/USD`, `USDT/USD`, `aUSD/USD`.

You can find the contract addresses & feeds on the Redstone documentation for [mainnet](https://app.redstone.finance/app/feeds/?page=1\&sortBy=popularity\&sortDesc=false\&perPage=32\&networks=4114) and for [testnet](https://app.redstone.finance/app/feeds/?page=1\&sortBy=popularity\&sortDesc=false\&perPage=32\&networks=5115).

***

## Available on Testnet

### Stork

[Stork](https://stork.network) provides real-time price feeds using a pull-oracle model. It allows developers to fetch the latest price data on demand, ensuring they always have access to the most current information.

You can check the Stork documentation [here](https://docs.stork.network/) to kickstart your development. Stork contracts deployed on Citrea Testnet are at the following address: [0x266795f5A45AEc26aBF7E1c923dC15Cbb1A4Ed96](https://explorer.testnet.citrea.xyz/address/0x266795f5A45AEc26aBF7E1c923dC15Cbb1A4Ed96?tab=contract)

***

### Supra dVRF

Supra dVRF delivers randomness that’s:

* Low-latency
* Tamper-proof (via threshold signatures + secret sharing)
* Unbiased + unpredictable (based on blockhash, nonce & user input)
* Verifiable on-chain with cryptographic proof

You can find the documentation for Supra dVRF [here](https://docs.supra.com/dvrf/v2-guide) and the contracts deployed on Citrea Testnet at the following addresses:

* **Router**: [0xDF666c76E859D6541FF17E1C6c215e46BfA563B2](https://explorer.testnet.citrea.xyz/address/0xDF666c76E859D6541FF17E1C6c215e46BfA563B2?tab=contract)
* **Deposit**: [0xcF99ab8c2AABC04349139484BAFC26f480Ef4cE4](https://explorer.testnet.citrea.xyz/address/0xcF99ab8c2AABC04349139484BAFC26f480Ef4cE4?tab=contract)


---

# 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.citrea.xyz/developer-documentation/ecosystem-tooling/oracles-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.