> For the complete documentation index, see [llms.txt](https://docs.emc.network/emc-testnet/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emc.network/emc-testnet/emc-testnet/estimate-gas-costs/precaution.md).

# Precaution

Network congestion: Gas prices may increase significantly during times of network congestion. It is recommended that you check the current Gas price before trading and adjust the Gas limit and Gas price as necessary.

Failed transaction: If the transaction fails, you still need to pay the gas fee that has been consumed. Therefore, make sure there are no logic errors or other issues with your transactions or contract calls.