Scanner
Continuously watches curated pairs and candidate markets from external discovery feeds.
Private beta · Polymarket + Kalshi
Operate cross-market arbitrage with fewer blind spots.
Arbie monitors cross-venue spreads, preflights liquidity, fees, and market rules, and keeps alerts and positions in one operating view.
- Monitor continuouslyWatch matched markets across venues.
- Preflight the edgeCheck semantics, depth, fees, and sizing.
- Stay in controlTrack alerts, fills, and open positions.
Plain-language example
Buy complementary outcomes when the combined cost is below $1.00.
If one venue offers a YES-like side at $0.42 and another venue offers the complement at $0.54, the combined cost is $0.96 before fees and slippage. The theoretical locked spread is $0.04 per matched share if the market semantics truly line up.
Venue A YES$0.42
Venue B complement$0.54
Why the edge is operational
The hard part is not spotting a cheap pair. It is proving it can be traded safely.
Semantic preflight
Checks title, target, resolution rules, venue status, order sizing, visible depth, and fees.
Execution tracking
Separates buy-ready, blocked, sell-ready, filled, failed, and partial-fill states.
Profit accounting
Labels realized cash profit, open locked resolution profit, mark-to-market risk, and stale data separately.
Why spreads appear
- Fragmented liquidity between venues.
- Different market-maker coverage and timing.
- Different user bases and risk preferences.
- Short-lived gaps between order-book updates.
Why they disappear
- Fees and minimum order sizes eat thin spreads.
- Shallow books make quoted prices unfillable.
- Resolution rules can be subtly incompatible.
- Cash gets stranded on the wrong venue.
Private beta
A careful beta, not a public launch.
We are starting with operators who already use prediction-market venues and want clearer visibility into cross-venue positions, alerts, and spread history.
01 Send your details02 Complete a short setup review03 Receive a beta invite
Apply for betaLatest public performance snapshot
Same profit, different honest views of capital efficiency.
The strict accounting view is intentionally conservative: total locked plus realized profit divided by fee-inclusive matched cost basis. The other lenses answer a different investor question: how hard the capital that was practically tied up was working.
Locked + realized P/L$46.44
Measured period return3.09%
Strict denominator$1,503.03
Live operating period38.24 days
Denominator: fee-inclusive cumulative matched arb cost basis. Annualized: 29.5%-33.7% annualized.
Denominator: capital practically in use during the live period, rather than every recycled dollar of turnover.
Denominator: peak capital tied up at one time. Useful for capital-efficiency storytelling, but more window-sensitive.
Snapshot from DigitalOcean audit generated July 7, 2026. Annualized figures are extrapolations from a short live operating period, not guarantees. Fees, liquidity, missed fills, idle cash, and resolution risk can materially change outcomes.
Risk language
Built for controls first.
Prediction markets can resolve unexpectedly. APIs can fail. Liquidity can vanish. Fees and partial fills can turn a quoted spread into a bad trade. This site is not investment advice and does not guarantee returns.
Interested in testing with your own accounts?Apply for private beta