How to increase the fill rate for limit order in polymarket?

[asseph]

🏷️ Discussion Type

Question

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Hi Everyone.

Now i am building polymarket trading bot. The strategy part is almost correct.

But in real env the fill rate is so low so getting loss every trade. If you know how to fix this issue then comment.

Best regards

[endovix]

This sounds more like an execution/market microstructure issue rather than a strategy problem.

A low fill rate on Polymarket usually comes from a combination of:

1. Passive orders (maker-only) sitting too far from the spread
   If you’re placing limit orders away from best bid/ask, they simply won’t get hit. You may need to tighten your quotes or dynamically follow the top of the book.

2. Latency and stale pricing
   Even small delays (1–2s) can make your orders irrelevant. If you're deriving signals from external sources (e.g., CEX data), your quotes may already be outdated when they reach the orderbook.

3. Liquidity fragmentation
   Some markets on Polymarket are thin. If size > available liquidity at your price level, partial or zero fills are expected.

4. No aggressive execution fallback
   If you only rely on maker orders, you’ll miss trades. Consider a hybrid approach:

• Start as maker
• If not filled within X ms → cross the spread (taker)

5. Order queue position
   Even at best price, being late in queue = low fill probability. You may need frequent re-posting or slight price improvement.

Possible improvements:

• Implement dynamic spread adjustment based on volatility and depth
• Use IOC/FOK orders for testing execution assumptions
• Add fill probability modeling (based on orderbook + trade flow)
• Monitor top-of-book changes and react faster
• Reduce order size or slice orders (TWAP-style)

In short: your edge might be correct, but without execution optimization, it won’t realize PnL.

[endovix]

Endovix, You are goat. Let me try