> For the complete documentation index, see [llms.txt](https://docs.citrea.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.citrea.xyz/developer-documentation/ecosystem-tooling/oracles-vrf.md).

# 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)


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