> For the complete documentation index, see [llms.txt](https://docs.kairos-timeboost.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kairos-timeboost.xyz/json-rpc-endpoints/submission-api.md).

# Submission API

Unlike on Ethereum mainnet, Kairos is not the block builder on Arbitrum. As such, we cannot extract builder payments implicitly. To ensure proper compensation and inclusion, submissions must explicitly transfer ETH within the transaction or bundle payload to the following address: `0x60E6a31591392f926e627ED871e670C3e81f1AB8`