How we chose these 10
This list focuses on dApps that settle bets or game logic on-chain, offer verifiability (e.g., provable randomness or transparent order books), and show real momentum or credible infrastructure circa 2025. Where possible, we cite primary sites, official docs, and reputable crypto media.
1) Polymarket (prediction markets)
Polymarket has become the most visible Web3 prediction market, with persistent headline-driving volume and continuous market discovery on major events. Recent coverage shows sustained billions in cumulative activity and frequent nine-figure bursts around news cycles.
It runs on Polygon and settles trades in USDC; the project has also explored steps to expand market access and optimize settlement rails.
2) SX Bet (exchange betting on SX Network)
SX Bet is a peer-to-peer sports betting exchange built atop SX Network, an EVM chain focused on betting apps. It exposes order-book APIs so users can “be the bookmaker” and programmatically place or fill orders.
The app positions itself as the largest blockchain betting exchange, emphasizing non-custodial, community-governed rails and low fees.
3) BetDEX Exchange + Monaco Protocol (Solana)
BetDEX operates a sports betting exchange on Solana and was the first blockchain betting exchange to obtain an Isle of Man licence; the team also builds Monaco Protocol, an open betting engine and liquidity network used by front-ends.
Monaco’s public repos and SDKs reflect the protocol-first approach for decentralized order books and shared liquidity.
4) Overtime (sports AMM by Thales)
Overtime runs a fully on-chain sportsbook/AMM stack tied to Thales Protocol, with integration docs and a 2025 rollout of account-abstraction UX and a native token to streamline onboarding.
Its docs outline how apps quote odds and interact with the Sports AMM contract on Optimism and related EVM networks.
5) Azuro Protocol (betting infrastructure)
Azuro is an infrastructure layer for prediction/sports betting that powers front-ends via peer-to-pool liquidity, vAMM-style odds, and tooling to launch apps across EVM chains. Think “betting middleware” rather than a single casino brand.
Community forum materials and explainers highlight its oracle, liquidity, and app-builder focus for scaling decentralized betting.
6) WINR Protocol + JustBet (on-chain casino stack)
WINR is an on-chain iGaming infrastructure with a multi-asset bankroll (WLP) that acts as the house for third-party games. Its flagship casino, JustBet, advertises non-custodial play, instant payouts, and decentralized randomness.
Roadmap notes the migration to Arbitrum and the “bankroll token as counterparty” design; independent dashboards describe JustBet as a fully on-chain casino.
7) BetSwirl (multi-chain casino with VRF)
BetSwirl offers roulette, coinflip, and more across multiple EVM chains and documents its use of Chainlink VRF for verifiable randomness, plus CCIP for bridging. It supports networks like Polygon, Arbitrum, Base, BNB Chain, and Avalanche.
Chainlink ecosystem listings and open SDKs further show the VRF integration used to prove fair outcomes.
8) PoolTogether (no-loss “prize savings”)
PoolTogether isn’t a casino in the traditional sense—it’s a no-loss prize savings protocol where deposits fund prize pools and you can withdraw anytime. It’s frequently cited as a core Web3 game-ified savings primitive and integrates Chainlink VRF for auditable randomness.
9) Decentral Games: Poker Arcade (metaverse poker)
Decentral Games built a prominent poker experience inside Decentraland that evolved from ICE Poker into a broader Poker Arcade and browser-based casino suite. It showcases the “social casino” angle of Web3 with NFTs and metaverse venues.
10) YOLOrekt (short-term price prediction games)
YOLOrekt runs on-chain, short-duration price prediction games with LP-backed liquidity and has expanded across EVM chains over time. Its site and materials frame it as a social, gamified way to bid on future prices.
Why “provably fair” matters (and how to check it)
Many casinos and game dApps use Chainlink VRF to generate randomness with on-chain proofs verified by smart contracts. When a project claims “provably fair,” look for links to VRF requests/fulfillments or seed-reveal systems you can recompute. Chainlink’s docs and security notes outline best practices that serious projects tend to follow.
What to consider before you play
Gas and network choice matter: Layer-2s like Arbitrum and Optimism reduce costs and improve UX for frequent betting. Account-abstraction and social login, where offered, can lower friction for newcomers. Always verify contract addresses and revoke unnecessary token approvals periodically.
Regulatory status varies by country. Some markets block unlicensed sites or restrict crypto deposits even in regulated systems. Always check local rules and the app’s licence/approvals where relevant.
Quick compare: categories and networks (at a glance)
• Prediction markets: Polymarket (Polygon)
• Sports exchanges: SX Bet (SX Network), BetDEX/Monaco (Solana)
• Sports AMMs: Overtime/Thales (Optimism/EVM)
• Casino infrastructure + apps: WINR/JustBet (Arbitrum), BetSwirl (multi-chain)
• No-loss prize games: PoolTogether (multi-chain)
• Metaverse poker/social casino: Decentral Games (Decentraland/Polygon)
• Price-prediction games: YOLOrekt (EVM)
FAQs
Is a “decentralized casino” legal everywhere?
No—licensing and payments are location-specific. Some jurisdictions license exchange betting or metaverse games; others restrict crypto deposits or block unlicensed sites. Always check local rules first.
How do I verify fairness?
Look for Chainlink VRF transaction links or seed-reveal pages and re-compute outcomes when possible. If you don’t see verifiable randomness, proceed with caution.
Which network is cheapest for frequent play?
Layer-2s typically offer the best fee/latency trade-off for EVM dApps; many apps above support Optimism, Arbitrum, or app-specific chains like SX Network.
