fuel-core run --help
...
--enable-relayer
          Enable the Relayer. By default, the Relayer is disabled, even when the binary is compiled with the "relayer" feature flag. Providing `--enable-relayer` will enable the relayer service

      --relayer <RELAYER>
          Uri address to ethereum client. It can be in format of `http://localhost:8545/` or `ws://localhost:8545/`. If not set relayer will not start
          
          [env: RELAYER=]

      --relayer-v2-listening-contracts <ETH_V2_LISTENING_CONTRACTS>
          Ethereum contract address. Create EthAddress into fuel_types
          
          [env: ETH_V2_LISTENING_CONTRACTS=]

      --relayer-da-deploy-height <DA_DEPLOY_HEIGHT>
          Number of da block that the contract is deployed at
          
          [env: DA_DEPLOY_HEIGHT=]
          [default: 0]

      --relayer-log-page-size <LOG_PAGE_SIZE>
          Number of pages or blocks containing logs that should be downloaded in a single call to the da layer
          
          [env: LOG_PAGE_SIZE=]
          [default: 10000]

      --relayer-min-duration-s <SYNC_MINIMUM_DURATION_SECS>
          The minimum number of seconds that the relayer polling loop will take before running again. If this is too low the DA layer risks being spammed
          
          [env: SYNC_MINIMUM_DURATION_SECS=]
          [default: 5]

      --relayer-eth-sync-call-freq-s <SYNCING_CALL_FREQUENCY_SECS>
          [env: SYNCING_CALL_FREQUENCY_SECS=]
          [default: 5]

      --relayer-eth-sync-log-freq-s <SYNCING_LOG_FREQUENCY_SECS>
          [env: SYNCING_LOG_FREQUENCY_SECS=]
          [default: 60]