> ## Documentation Index
> Fetch the complete documentation index at: https://docs.herodotus.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuration Reference

> Environment variables and runtime configuration for HDP

HDP reads runtime configuration from environment variables.\
The CLI loads `.env` automatically.

## RPC endpoints

```bash theme={null}
RPC_URL_ETHEREUM_MAINNET=
RPC_URL_ETHEREUM_TESTNET=
RPC_URL_OPTIMISM_MAINNET=
RPC_URL_OPTIMISM_TESTNET=
RPC_URL_STARKNET_MAINNET=
RPC_URL_STARKNET_TESTNET=
RPC_URL_HERODOTUS_INDEXER=https://rs-indexer.api.herodotus.cloud/
```

`RPC_URL_HERODOTUS_INDEXER` points to the [Herodotus Indexer](/data-structure-indexer-api/introduction), used for header commitment proof retrieval.

## Injected state

```bash theme={null}
INJECTED_STATE_BASE_URL=http://localhost:3000
```

Set this explicitly when using injected state.

See injected-state flow details in [State management](/data-processor/state-management) and [State Server](/data-processor/state-server).

## Validate environment for a run

```bash theme={null}
hdp env-check --inputs dry_run_output.json
```

This checks only the RPC endpoints required by the specific key set in that dry-run output.

## Logging

Use either:

* `--log-level <LEVEL>` / `--debug`
* `RUST_LOG=<LEVEL>`

## Advanced

* `HDP_SOUND_RUN_PATH` - override compiled sound-run program path