Risk-free arbitrage
on Polymarket.
PolyArbi detects binary and negRisk arbitrage opportunities in real time, routes orders directly to the CLOB through your MetaMask, and tracks resolved PnL automatically.
Non-custodial · No private keys stored · Direct CLOB execution
Built for the way arbitrage actually works.
Not a dashboard pretending to be a tool. Every part of the stack — orderbook, fee math, execution, resolution — is wired to the live Polymarket primitives.
Real-time signal engine
Websocket-streamed orderbook from Polymarket CLOB. Signals fire the instant a price update creates a sub-$1 basket. No polling, no stale data.
Binary + negRisk strategies
Detects classic YES/NO binary arbitrage and multi-outcome negRisk baskets across every active event. Fees, slippage and depth are priced in.
Non-custodial execution
Orders are signed in your browser by MetaMask and submitted straight to the CLOB. We never see your private key, your funds or your L2 API creds.
PnL + resolution tracking
Every trade is persisted with cost basis. A background worker reconciles resolutions against Gamma and marks voided markets — true realized PnL, not estimates.
Discord exit alerts
Get notified when an open position's exit value crosses a threshold. One webhook, configurable per address, fired only on meaningful change.
Per-user fee discount
Plug in your Polymarket fee discount and every signal sizes itself against your real effective fee. The displayed edge is conservative.
From signal to settled position in four steps.
No keystore upload, no proxy address handover, no server-side signing.
- 01
Connect MetaMask
SIWE handshake on Polygon. PolyArbi resolves your Safe proxy from Gamma and derives your CLOB L2 credentials once, in-browser.
- 02
Set your trading params
Max position, minimum profit threshold, fee discount, and an optional Discord webhook. Stored against your address — never global.
- 03
Watch live signals
The engine streams every binary and negRisk opportunity that clears your minimum-profit filter, sized against current book depth.
- 04
Execute in one click
Click a signal: orders are built, signed, and FOK-submitted to the CLOB through your wallet. Trade rows persist for resolution tracking.
Frequently asked.
Is this really risk-free? +
The arbitrage edge is mathematical: buying YES + NO (or every leg of a negRisk basket) for less than $1 guarantees a payout of $1 minus fees at resolution. Residual risks are execution slippage between signal and fill, market voiding before resolution, and counterparty risk on Polymarket itself.
Do you take custody of funds? +
No. Orders are signed in your browser by MetaMask and submitted directly to the Polymarket CLOB. We never store your private key, your L2 API credentials, or your proxy address server-side.
What does it cost? +
Polymarket charges a fee per share equal to feeRate × price × (1 − price). We compute it against your real per-account discount so the displayed edge is what you actually earn.
What's the difference between binary and negRisk arbitrage? +
Binary: two-outcome markets where YES + NO < $1. negRisk: multi-outcome events where buying YES in every outcome for a combined cost below $1 guarantees a winner.
How fast are signals? +
Reactive. The engine reacts to every websocket orderbook update. There is no scan loop — a signal fires the moment a price change makes a basket profitable.
Which chain? +
Polygon mainnet. PolyArbi will auto-switch your MetaMask network on connect.
Ready to scan for risk-free edge?
Connect MetaMask, set your params, and start seeing live signals in under a minute.