> For the complete documentation index, see [llms.txt](https://firehose.streamingfast.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://firehose.streamingfast.io/firehose/overview/chains/ethereum/base.md).

# Base

This page provides Base specific configuration. First read the [Ethereum general notes](/firehose/overview/chains/ethereum.md) for common information.

## Docker Image

```
ghcr.io/streamingfast/go-ethereum:optimism-<version>-fh3.0
```

[View available versions on GitHub Packages](https://github.com/streamingfast/go-ethereum/pkgs/container/go-ethereum)

Base is built on the OP Stack, so it uses the same Firehose-patched OP Geth. The image contains both the binary and `fireeth`.

## Client Binary

| Client                     | Repository                                                        |
| -------------------------- | ----------------------------------------------------------------- |
| OP Geth (Firehose-patched) | [streamingfast/op-geth](https://github.com/streamingfast/op-geth) |

## Networks

| Network      | Chain Name     |
| ------------ | -------------- |
| Base Mainnet | `base-mainnet` |
| Base Sepolia | `base-sepolia` |

## OP Node Dependency

{% hint style="warning" %}
Base requires an OP Node (consensus client) running alongside OP Geth. The OP Node connects to Ethereum L1 for state derivation. Refer to the [Base documentation](https://docs.base.org/guides/run-a-base-node/) for OP Node setup.
{% endhint %}

## Reader Node Configuration

### Base Mainnet

```bash
fireeth start reader-node <apps> \
  --advertise-chain-name="base-mainnet" \
  --reader-node-path="geth" \
  --reader-node-arguments="--datadir={node-data-dir} --networkid=8453 --op-network=base-mainnet --rollup.sequencerhttp=https://mainnet-sequencer.base.org/ --authrpc.addr=0.0.0.0 --authrpc.port=8551 --authrpc.vhosts=* --authrpc.jwtsecret=/path/to/jwt.hex --vmtrace=firehose --state.scheme=path" \
  <other_flags...>
```

### Base Sepolia

```bash
fireeth start reader-node <apps> \
  --advertise-chain-name="base-sepolia" \
  --reader-node-path="geth" \
  --reader-node-arguments="--datadir={node-data-dir} --networkid=84532 --op-network=base-sepolia --rollup.sequencerhttp=https://sepolia-sequencer.base.org/ --authrpc.addr=0.0.0.0 --authrpc.port=8551 --authrpc.vhosts=* --authrpc.jwtsecret=/path/to/jwt.hex --vmtrace=firehose --state.scheme=path" \
  <other_flags...>
```

## Key OP Geth Flags

| Flag                     | Description                                              |
| ------------------------ | -------------------------------------------------------- |
| `--vmtrace=firehose`     | **Required.** Enables Firehose Protocol output           |
| `--op-network`           | OP Stack network name (`base-mainnet` or `base-sepolia`) |
| `--networkid`            | Network ID (8453 for Base Mainnet)                       |
| `--rollup.sequencerhttp` | Sequencer endpoint for transaction submission            |
| `--authrpc.jwtsecret`    | Path to JWT secret for OP Node connection                |
| `--state.scheme=path`    | Recommended state storage scheme                         |
| `--datadir`              | Data directory (use `{node-data-dir}` template)          |

## Resources

* [Base Documentation](https://docs.base.org/)
* [Run a Base Node](https://docs.base.org/guides/run-a-base-node/)
* [streamingfast/op-geth](https://github.com/streamingfast/op-geth)