# Randoo

> Randoo is a drop-in VRF coordinator for the Ronin blockchain. Game contracts call requestRandomSeed, pay extra RON with the request, and receive a verifiable random seed on-chain in about two seconds. It implements the same IRoninVRFCoordinatorForConsumers ABI as native Ronin VRF at half the $0.01 service fee, with no subscription.

Randoo is not native Sky Mavis VRF. Games opt in by deploying their consumer with the Randoo coordinator address. Primary documentation language: English.
Website: https://randoo.xyz

## Facts

- Product: Randoo, a VRF coordinator for Ronin games
- Website: https://randoo.xyz
- ABI: IRoninVRFCoordinatorForConsumers — requestRandomSeed, estimateRequestRandomFee, rawFulfillRandomSeed
- Billing: pay per request in RON, no subscription, no LINK
- Service fee: half of native Ronin VRF ($0.01), quoted on-chain
- Latency: about two seconds p50 request-to-callback
- Proof: Chainlink-format VRF.sol verifier; seed bound to the request
- Coordinator (Ronin mainnet + Saigon): 0xC66eB2e7EE91145875000Ad46B55600000000001
- Native Ronin VRF mainnet: 0x16a62a921e7fec5bf867ff5c805b662db757b778
- Native Ronin VRF Saigon: 0xa60c1e07fa030e4b49eb54950adb298ab94dd312
- Source: https://github.com/dwi/randoo
- Ronin VRF reference: https://docs.roninchain.com/developers/tools/vrf

## Pages

- [Randoo — Ronin VRF coordinator](https://randoo.xyz/): Drop-in Ronin VRF for games. Same requestRandomSeed ABI as native Ronin VRF, half the $0.01 fee, verifiable seed in about two seconds.
- [Randoo docs](https://randoo.xyz/docs): Developer documentation for the Randoo Ronin VRF coordinator: quickstart, ABI, contracts, SDK, workers, and gas.
- [Quickstart](https://randoo.xyz/docs/quickstart): Deploy a Ronin VRFConsumer against Randoo, quote estimateRequestRandomFee, and request a verifiable seed.
- [Migrate from Ronin VRF](https://randoo.xyz/docs/ronin): Swap one coordinator address and your existing Ronin VRFConsumer runs on Randoo at half the service fee.
- [Contracts](https://randoo.xyz/docs/contracts): Randoo coordinator, proof verifier, and consumer addresses for Saigon and Ronin mainnet.
- [SDK](https://randoo.xyz/docs/sdk): TypeScript helpers for quoting and requesting Randoo VRF randomness.
- [Workers](https://randoo.xyz/docs/workers): How the Randoo oracle watches, proves, and fulfills VRF requests.
- [Gas and failure](https://randoo.xyz/docs/gas): Randoo fee quotes, gas spikes, callbacks, and refunds.
- [Pricing](https://randoo.xyz/pricing): Randoo is pay-per-request at half the native Ronin VRF $0.01 service fee. No subscription.
- [Networks](https://randoo.xyz/networks): Randoo coordinator 0xC66eB2e7EE91145875000Ad46B55600000000001 on Ronin mainnet (chain 2020) and Saigon (chain 202601).
- [Playground](https://randoo.xyz/playground): Race Randoo against native Ronin VRF in the browser and watch whose seed lands first.

## Optional

- [llms-full.txt](https://randoo.xyz/llms-full.txt): longer citation sheet with FAQ answers