# arrng.io

## arrng.io

- [Introduction](https://docs.arrng.io/introduction.md): aarng provides fast, reliable, cheap and verifiable off-chain RNG to a wide variety of blockchains.
- [Supported Chains](https://docs.arrng.io/supported-chains.md): Where can you use arrng?
- [How it works](https://docs.arrng.io/how-it-works.md)
- [RNG Source](https://docs.arrng.io/rng-source.md)
- [Getting a cost estimate](https://docs.arrng.io/getting-a-cost-estimate.md)
- [Implementing in your contract](https://docs.arrng.io/implementing-in-your-contract.md)
- [Verifiying RNG](https://docs.arrng.io/verifiying-rng.md)
- [Controller contract addresses](https://docs.arrng.io/controller-contract-addresses.md)
- [Fee](https://docs.arrng.io/fee.md)
- [Refunds](https://docs.arrng.io/refunds.md)
- [arrscan.io](https://docs.arrng.io/arrscan.io.md)