DeFi and On-Chain Betting
DeFi, short for decentralised finance, is financial activity run by smart contracts on a public blockchain instead of by a company holding customer money. A contract holds the funds and follows its code: it releases a payout, settles a trade or lends an asset when its conditions are met. For crypto gamblers, DeFi matters because on-chain sportsbooks, prediction markets and many crypto casino rails are built on it.
- Filings
- 2
- Latest
- 23 Oct 2026
How does a DeFi smart contract handle money?
The contract keeps funds in escrow and moves them only according to its rules. Those rules depend on inputs: balances already on chain, prices or results supplied by an oracle, and, in many protocols, decisions made by token holders through governance. Each input is a point where things can go wrong. A manipulated price feed can make a contract pay out against a false value, and a governance vote can be captured by someone who borrows enough tokens to pass a proposal. Our read on DeFi smart contract failures traces documented cases, including Mango Markets and Beanstalk, back to the input that failed.
How do on-chain bets settle?
An on-chain sportsbook replaces the bookmaker's balance sheet with a contract. In pool-based designs such as Azuro, liquidity providers fund a pool that takes the other side of each bet and earns the margin. In order-book designs, bettors trade against each other. Either way, the result has to come from somewhere off chain, usually an oracle with its own dispute process, and a disputed or delayed result can hold a payout until it is resolved. Our read on DeFi sports betting shows where an on-chain bet's result comes from and what can stall it.
What are the main risks?
Smart contract bugs, oracle failures, governance attacks, and the plain fact that on-chain transfers cannot be reversed once they confirm. Audits reduce the first risk but do not remove it. Liquidity providers in a betting pool carry the house's risk, not a guaranteed yield.
How Polycasino covers DeFi
Filings start from protocol documentation, contract code references, explorers and post-incident reports, and every figure is tied to a dated source. Start with the sports betting read for mechanics, then the failures read for risk.