<p class="card-subtitle margin-bottom-0"><%= gettext "This API is provided for developers transitioning their applications from Etherscan to BlockScout. It supports GET and POST requests." %></p>
| `SOURCE_MODULE` | | This environment variable is used to calculate the exchange rate and is specifically used by the xDai Chain. | false | all |
| `DATABASE_URL` | | Production environment variable to define the Database endpoint. | (empty) | all |
| `POOL_SIZE` | | Production environment variable to define the number of database connections allowed. | 20 | all |
| `ECTO_USE_SSL`| | Production environment variable to use SSL on Ecto queries. | true | all |
| `DATADOG_HOST` | | Host configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/) | (empty) | all |
| `DATADOG_PORT` | | Port configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/). | (empty} | all |
| `ECTO_USE_SSL`| | Production environment variable to use SSL on Ecto queries. | true | all |
| `DATADOG_HOST` | | Host configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/) | (empty) | all |
| `DATADOG_PORT` | | Port configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/). | (empty} | all |
| `SPANDEX_BATCH_SIZE` | | [Spandex](https://github.com/spandex-project/spandex) and Datadog configuration setting. | (empty) | all |
| `SPANDEX_SYNC_THRESHOLD` | | [Spandex](https://github.com/spandex-project/spandex) and Datadog configuration setting. | (empty) | all |
| `HEART_BEAT_TIMEOUT` | | Production environment variable to restart the application in the event of a crash. | 30 | all |
@ -48,7 +48,7 @@ $ export NETWORK=POA
| `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 |
| `LAST_BLOCK` | | The block number, where indexing stops. | (empty) | v2.0.3+ |
| `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+ |
@ -56,9 +56,9 @@ $ export NETWORK=POA
| `SUPPORTED_CHAINS` | | Array of supported chains that displays in the footer and in the chains dropdown. This var was introduced in this PR [#1900](https://github.com/poanetwork/blockscout/pull/1900) and looks like an array of JSON objects. | (empty) | v2.0.0+ |
| `BLOCK_COUNT_CACHE_PERIOD ` | | time to live of cache in seconds. This var was introduced in [#1876](https://github.com/poanetwork/blockscout/pull/1876) | 600 | v2.0.0+ |
| `ALLOWED_EVM_VERSIONS ` | | the comma-separated list of allowed EVM versions for contracts verification. This var was introduced in [#1964](https://github.com/poanetwork/blockscout/pull/1964) | "homestead, tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg" | v2.0.0+ |
| `DISABLE_WEBAPP` | | If `true`, endpoints to webapp are hidden (compile-time) | `false` | master |
| `DISABLE_READ_API` | | If `true`, read-only endpoints to API are hidden (compile-time) | `false` | master |
| `DISABLE_WRITE_API` | | If `true`, write endpoints to API are hidden (compile-time) | `false` | master |
| `DISABLE_INDEXER` | | If `true`, indexer application doesn't run | `false` | master |
| `WEBAPP_URL` | | Link to web application instance, e.g. `http://host/path` | (empty) | master |
| `API_URL` | | Link to API instance, e.g. `http://host/path` | (empty) | master |
| `DISABLE_WEBAPP` | | If `true`, endpoints to webapp are hidden (compile-time) | `false` | v2.0.3+ |
| `DISABLE_READ_API` | | If `true`, read-only endpoints to API are hidden (compile-time) | `false` | v2.0.3+ |
| `DISABLE_WRITE_API` | | If `true`, write endpoints to API are hidden (compile-time) | `false` | v2.0.3+ |
| `DISABLE_INDEXER` | | If `true`, indexer application doesn't run | `false` | v2.0.3+ |
| `WEBAPP_URL` | | Link to web application instance, e.g. `http://host/path` | (empty) | v2.0.3+ |
| `API_URL` | | Link to API instance, e.g. `http://host/path` | (empty) | v2.0.3+ |