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Prediction Market Smart Order Router (SOR) SaaS
A SaaS platform that automatically splits large prediction market orders across Kalshi and Polymarket to minimize price slippage. By acting as a unified execution layer, it saves active traders thousands of dollars on large positions.
Why this matters
When you trade large positions on prediction markets, placing your entire order on a single venue exhausts the order book and drives your entry price up, costing you hundreds or thousands in slippage. You know splitting the order across multiple platforms like Kalshi and Polymarket would get you a much better price, but doing it manually is too slow. By the time you route the second leg, the thin book moves against you, leaving you exposed with a one-sided position. You need an automated tool that instantly splits and routes your order across venues to capture the best blended price without the execution risk.
- · Built for Active retail and prop prediction market traders executing $1,000+ positions on Kalshi or Polymarket.
- · Most likely monetization: SaaS subscription.
The Pain · Narrative
When you trade large positions on prediction markets, placing your entire order on a single venue exhausts the order book and drives your entry price up, costing you hundreds or thousands in slippage. You know splitting the order across multiple platforms like Kalshi and Polymarket would get you a much better price, but doing it manually is too slow. By the time you route the second leg, the thin book moves against you, leaving you exposed with a one-sided position. You need an automated tool that instantly splits and routes your order across venues to capture the best blended price without the execution risk.
Score Breakdown
Market Signal
Go-to-Market
Active prediction market traders sizing into $1,000+ positions on political and sports events who are currently losing money to slippage
~5,000-10,000 high-volume traders globally
r/algotrading and prediction market community organic posts
$99/month
20 beta users from community posts within 30 days
MVP Scope · 1–2 weeks
- Build WebSocket connectors for Kalshi and Polymarket order books
- Create a settlement-rule matching algorithm to identify identical markets
- Develop a basic order book depth analyzer to calculate slippage for a given size
- Implement a simple routing calculator that outputs the optimal split for an order
- Set up a basic CLI or web dashboard to input a target order and view the routing plan
- Integrate order execution APIs for both venues to fire routed orders simultaneously
- Add worst-price cap logic to prevent bad fills on individual legs
- Implement a basic hedging or rollback mechanism if one leg fails to fill
- Build an execution quality dashboard showing savings versus single-venue trades
- Run end-to-end paper trading tests to measure latency and fill rates
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Execution latency between venues is too high, causing the second leg to miss the price and negating the routing advantage entirely.
- 2Prediction market venues like Kalshi or Polymarket may update their APIs or add rate limits that break the router, or they could build native cross-venue routing themselves.
- 3The total addressable market of high-volume prediction market traders is too small to sustain a standalone SaaS business if trading volumes decline after major events.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
Multiple commenters highlighted massive cost savings from routing orders across fragmented prediction market venues, with one example saving over $1,000 on a single 10k contract order. Several users noted that thin books compound slippage rapidly as order size increases. Two commenters specifically flagged the execution risk of manual routing, where the first leg fills but the second leg's price moves away before the order lands, leaving the trader exposed. This signals a clear need for an automated, latency-optimized smart order router.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Validate
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Landing Page Copy Kit
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Headline
Prediction Market Smart Order Router (SOR) SaaS
Sub-headline
A SaaS platform that automatically splits large prediction market orders across Kalshi and Polymarket to minimize price slippage. By acting as a unified execution layer, it saves active traders thousands of dollars on large positions.
Who It's For
For Active retail and prop prediction market traders executing $1,000+ positions on Kalshi or Polymarket
Feature List
✓ Cross-venue order book viewer ✓ Automated smart order routing engine ✓ Execution quality analytics dashboard ✓ Worst-price cap protection settings ✓ Settlement-rule matcher to identify identical markets ✓ Real-time cross-venue order book heatmaps ✓ Slippage calculator for custom order sizes ✓ Historical execution quality metrics
Where to Validate
Share your landing page in r/r/algotrading — that's exactly where these pain points were discovered.
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