Introducing Predictifi
Predictifi is an on-chain prediction market protocol on Base Sepolia (testnet) — transparent LMSR prices, real-world outcomes, and a flat 2% fee. Here is what we built and why.
Today we are introducing Predictifi, an on-chain prediction market protocol running on Base Sepolia (testnet), with test USDC that has no monetary value. Predictifi lets anyone take a position on the outcome of a real-world event, with prices set by a transparent, published market-making rule and every trade settling on-chain.
Why we built it
The best forecasting tool ever invented is a market price. When people stake real value on an outcome, the price aggregates their information into a single, continuously-updating probability. We wanted that tool to be open, verifiable, and free of a hidden house edge.
So every part of Predictifi's economics — pricing, fees, leverage, and payouts — is enforced on-chain by open-source smart contracts covered by an in-repo Foundry test suite (unit, fuzz and stateful-invariant), not by a server you have to trust. They have not been reviewed by an external security firm. Anyone can read the contract state and verify exactly how a price moved and exactly what a winning position redeems for. Resolution is the one step that is not trustless today: a protocol administrator declares the final outcome.
How it works, briefly
- LMSR pricing. Outcome prices come from a Logarithmic Market Scoring Rule and always sum toward $1.00, representing the crowd's implied probability.
- A flat 2% fee. Each trade pays a total of 2% — 0.5% to the market creator and 1.5% to liquidity providers and the protocol recipient. No deposit, withdrawal, or account fees.
- Optional leverage. Eligible markets support volume-gated leverage (2× and 3× for everyone, 5× and 10× as your traded volume grows) with on-chain liquidation protected by a cooldown and a time-weighted price check.
- Bonded, administrator-declared resolution. Anyone may propose the winning
outcome by posting a bond, which immediately freezes trading in that market. A
protocol administrator then declares the final outcome, rejects the proposal, or
voids the market. There is no dispute window and no automatic finalization. If no
administrator acts within 30 days of a proposal, anyone may call
voidStaleto void the market; holders then claim a refund, paid in the order claims arrive.
What is next
Predictifi is launching on Base Sepolia with the full product — markets, trading, leverage, conditional orders, and resolution. From here we are working toward an external security review, a production optimistic oracle to replace the administrator declaration, and a staged mainnet rollout. There is no token; the rewards layer tracks points and achievements from your on-chain activity, with a token-ready seam for the future.
Read the whitepaper for the full design, or jump into the docs to make your first prediction.