| `BLOCK_TRANSFORMER` | | Transformer for blocks: base or clique. | base | v1.3.4+ |
| `GRAPHIQL _TRANSACTION` | | Default transaction in query to GraphiQL. | (empty) | v1.3.4+ |
| `FIRST_BLOCK` | | The block number, where indexing begins from. | 0 | v1.3.8+ |
| `LAST_BLOCK` | | The block number, where indexing stops. | (empty) | master |
| `TXS_COUNT_CACHE_PERIOD` | | Interval in seconds to restart the task, which calculates the total txs count. | 60 * 60 * 2 | v1.3.9+ |
| `ADDRESS_WITH_BALANCES`<br/>`_UPDATE_INTERVAL`| | Interval in seconds to restart the task, which calculates addresses with balances. | 30 * 60 | v1.3.9+ |
| `LINK_TO_OTHER_EXPLORERS` | | true/false. If true, links to other explorers are added in the footer | (empty) | v1.3.0+ |