Common Mistakes

Error is human

Common Pitfalls in Solver Operation Generation

Solver Operation Configuration Issues

1. Incorrect Solver Calldata Encoding

• ❌ Encoding the Atlas solver call interface instead of the internal solver contract call

• ✅ Should use: solverContract.interface.encodeFunctionData('solve')

• Common error: Using Atlas ABI to encode the call instead of the solver contract's ABI

2. Outdated Contract Addresses

• Dapp Control address not matching the deployed network version

• Dapp signer address not matching the current environment

• Atlas contract address mismatch between environments

Addresses & Endpoints

3. Gas Configuration

• Not accounting for gas overhead in the operation

• Using incorrect gas price calculations for legacy vs EIP-1559 transactions

• Not properly handling maxFeePerGas and maxPriorityFeePerGas for EIP-1559 transactions

4. Signature Related Issues

• Using wrong signer for operation signing

• Not handling signature recovery parameters correctly

• Missing or incorrect chainId in signing process

5. Deadline Configuration

• Setting too short or too long deadlines (deadline in block number)

• Using timestamps instead of block number for deadlines

6. Bid Token Configuration

• Using incorrect token decimals in bid amounts

• Incorrect zero address usage for native token bids

7. Operation Hash Calculation

• Incorrect user operation hash calculation for backrun transactions

• Not properly handling legacy vs EIP-1559 transaction parameters in hash calculation

• not using the opportunity transaction matching gas settings

8. Permission and Access Issues

• Solver contract not properly authorized on Atlas

9. Value Transfer Issues

• Incorrect handling of value field for native token transfers

• Not accounting for bid amount in value field when required

• Not sending the bidAmount to the executionEnvironment

10. Environment Specific Issues

• Using production addresses in testing environment

• Not properly handling different network configurations

• Missing environment-specific parameter adjustments