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Working with automated smart contracts often leads to unforeseen conflicts in the underlying blockchain code. Identifying the root cause in gateway is the first essential step toward restoring normal operations. Many users found success by simply adjusting the slippage tolerance to fix 400 in their settings. The execution failure error 400 might be a result of the high volatility affecting gas prices.
The gateway smart contracts might require a specific version of the compiler to fix 400. Testing the fix for 400 on a testnet like Sepolia is a safe way to verify the solution. Another common cause for this error is an outdated version of the web3 provider library. The complexity of cross-chain bridges often leads to unique sets of execution errors.
Make sure your bridge provider is fully operational to avoid 400 during the process. The lessons learned from troubleshooting this issue will make you a more resilient participant.
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