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🚨 POLYMARKET TRADING BOT ERRORS:
Your bot is getting rejected and you have no idea why.
Most developers see an error, log it as a failed order and move on.
That is the wrong response.
Every rejection code from Polymarket's API tells you something specific about your bot's state.
Ignoring the pattern means the same failure hits you over and over silently.
Here is exactly what the most common rejections actually mean and what to do about each one:
Invalid nonce errors mean your bot is reusing or submitting out-of-sequence transaction identifiers.
This usually happens when you have multiple order attempts firing too close together from the same wallet.
Fix: implement strict nonce management with a sequential queue. Never fire two orders from the same wallet simultaneously.
Insufficient balance rejections look obvious but the real cause is often a timing issue not an actual lack of funds.
Your bot checked the balance, saw enough capital, then another order from the same wallet settled before this one fired.
Fix: maintain a local balance tracker that accounts for all pending orders before approving new ones.
Never rely solely on API balance calls for fast execution.
Order size below minimum errors kill strategies that dynamically size positions based on edge calculations.
When edge is thin the math produces tiny order sizes that hit Polymarket's minimum threshold.
Fix: add a minimum size gate before order submission.
If calculated size falls below threshold skip the trade entirely rather than submitting and getting rejected.
Signature verification failures are the most dangerous because they corrupt state silently.
The order never reached the book but your bot may have logged it as submitted.
Fix: every signature failure needs an immediate reconciliation check.
Verify on-chain state before your bot takes any subsequent action in that market.
Timeout followed by a fill is the ghost fill problem in disguise.
API returns an error but the order settled on-chain anyway.
Fix: after every timeout poll the order status endpoint directly before assuming the order failed.
Rejection patterns are not random noise.
They are your bot telling you exactly where the state management is broken.
Read them.
I am going to drop a full scale article with a detailed guide based on my experience tomorrow.
Don't miss this out.
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