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

# Backend ENVs: Integrations

<Info>
  The following ENVs are used for different integrations. Some work with various microservices (when the variable begins with MICROSERVICE) while others are contained within the application.

  More info on Blockscout Rust MicroServices is available in the [blockscout-rs Github Repo](https://github.com/blockscout/blockscout-rs/tree/main).
</Info>

## Time format

Can be set in format `1h` for 1 hour, `1m` for 1 minute, `1s` or `1` for 1 second, `1ms` for 1 millisecond

<Warning>
  ***Note*** **: Before release 5.1.2, all environment variables of time format supported only integers in seconds (without dimensions) as values.**
</Warning>

## Smart-contract verifier / Eth Bytecode DB

<Info>
  Connecting to the smart contract verification service
</Info>

| Variable                                                | Description                                                                                                                                                                                                                                                                               | Parameters                                                                                                 |
| ------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- |
| `MICROSERVICE_SC_VERIFIER_ENABLED`                      | If `true`, integration with [Rust smart-contract verifier](https://github.com/blockscout/blockscout-rs/tree/main/smart-contract-verifier) is enabled. `true` is the default value starting from version 6.4.0. Implemented in [#5860](https://github.com/blockscout/blockscout/pull/5860) | Version: v5.1.3+ <br />Default: `true` <br />Applications: API                                             |
| `MICROSERVICE_SC_VERIFIER_URL`                          | URL of Rust smart-contract verifier. Implemented in [#5860](https://github.com/blockscout/blockscout/pull/5860)                                                                                                                                                                           | Version: v5.1.3+ <br />Default: `https://eth-bytecode-db.services.blockscout.com/` <br />Applications: API |
| `MICROSERVICE_ETH_BYTECODE_DB_INTERVAL_BETWEEN_LOOKUPS` | Minimal time after unsuccessful check of smart contract's sources in Eth Bytecode DB. Implemented in [#7187](https://github.com/blockscout/blockscout/pull/7187).                                                                                                                         | Version: v5.1.3+ <br />Default: `10m` <br />Applications: API                                              |
| `MICROSERVICE_SC_VERIFIER_TYPE`                         | Type of smart contract microservice could be either `eth_bytecode_db` or `sc_verifier`. Implemented in [#7187](https://github.com/blockscout/blockscout/pull/7187)                                                                                                                        | Version: v5.1.3+ <br />Default: `sc_verifier` <br />Applications: API                                      |
| `MICROSERVICE_ETH_BYTECODE_DB_MAX_LOOKUPS_CONCURRENCY`  | Maximum amount of concurrent requests for fetching smart contract's sources in Eth Bytecode DB. Implemented in [#8472](https://github.com/blockscout/blockscout/pull/8472)                                                                                                                | Version: v5.3.0+ <br />Default: `10` <br />Applications: API                                               |
| `MICROSERVICE_SC_VERIFIER_API_KEY`                      | API key for verification that metadata sent to verifier microservice from a trusted source. Implemented in [#8750](https://github.com/blockscout/blockscout/pull/8750)                                                                                                                    | Version: v5.3.2+ <br />Default: (empty) <br />Applications: API                                            |

## Sol2Uml

<Info>
  Sol2Uml is a visualization tool for Solidity contracts.
</Info>

<Frame caption="Scroll down on the contract page to find the View UML diagram link">
  <img src="https://mintcdn.com/blockscout/JTppjXqh5Q4u166M/images/13468a98-image.jpeg?fit=max&auto=format&n=JTppjXqh5Q4u166M&q=85&s=2cfc88f19921d545254deed1ac7c5115" alt="" width="2304" height="1036" data-path="images/13468a98-image.jpeg" />
</Frame>

<Frame caption="Contract visualization example">
  <img src="https://mintcdn.com/blockscout/JTppjXqh5Q4u166M/images/10610308-image.jpeg?fit=max&auto=format&n=JTppjXqh5Q4u166M&q=85&s=dfe27455f240b24e4f8d92acd4eaef3b" alt="" width="2302" height="1528" data-path="images/10610308-image.jpeg" />
</Frame>

| Variable                                 | Description                                                                                                                                                                                                    | Parameters                                                      |
| ---------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `MICROSERVICE_VISUALIZE_SOL2UML_ENABLED` | If `true`, integration with [Rust sol2uml visualizer](https://github.com/blockscout/blockscout-rs/tree/main/visualizer) is enabled. Implemented in [#6401](https://github.com/blockscout/blockscout/pull/6401) | Version: v5.1.3+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_VISUALIZE_SOL2UML_URL`     | URL of Rust visualizer. Implemented in [#6401](https://github.com/blockscout/blockscout/pull/6401)                                                                                                             | Version: v5.1.3+ <br />Default: (empty) <br />Applications: API |

## Sig-provider

<Info>
  The Sig-provider microservice is used by Blockscout to display decoded transaction data on transaction pages and to determine transaction actions
</Info>

| Variable                            | Description                                                                                                                                                                                                        | Parameters                                                      |
| ----------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------- |
| `MICROSERVICE_SIG_PROVIDER_ENABLED` | If `true`, integration with [Rust sig-provider service](https://github.com/blockscout/blockscout-rs/tree/main/sig-provider) is enabled. Implemented in [#6541](https://github.com/blockscout/blockscout/pull/6541) | Version: v5.1.3+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_SIG_PROVIDER_URL`     | URL of Rust sig-provider service. Implemented in [#6541](https://github.com/blockscout/blockscout/pull/6541)                                                                                                       | Version: v5.1.3+ <br />Default: (empty) <br />Applications: API |

## Blockscout ENS

<Info>
  Blockscout ENS provides indexed data of domain name service for blockscout instances. [Learn more](https://github.com/blockscout/blockscout-rs/tree/main/blockscout-ens).
</Info>

| Variable                               | Description                                                                                                                                                                                                                                                                                            | Parameters                                                       |
| -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------- |
| `MICROSERVICE_BENS_ENABLED`            | If `true`, integration with [Blockscout ENS service](https://github.com/blockscout/blockscout-rs/tree/main/blockscout-ens) is enabled. Implemented in [#8972](https://github.com/blockscout/blockscout/pull/8972)                                                                                      | Version: v5.4.0+ <br />Default: (empty) <br />Applications: API  |
| `MICROSERVICE_BENS_URL`                | URL of Blockscout ENS service. Implemented in [#8972](https://github.com/blockscout/blockscout/pull/8972)                                                                                                                                                                                              | Version: v5.4.0+ <br />Default: (empty) <br />Applications: API  |
| `DISABLE_BLOCKS_BENS_PRELOAD`          | If `true`, skips ENS name preloading in responses for block list endpoints: `/api/v2/blocks`, `/api/v2/main-page/blocks`, `/api/v2/blocks/optimism-batch/:batch_number`, `/api/v2/blocks/scroll-batch/:batch_number`.                                                                                  | Version: v11.0.0+ <br />Default: `false` <br />Applications: API |
| `DISABLE_TRANSACTIONS_BENS_PRELOAD`    | If `true`, skips ENS name preloading in responses for transaction list endpoints: `/api/v2/transactions`, `/api/v2/transactions/watchlist`, `/api/v2/main-page/transactions`, `/api/v2/main-page/transactions/watchlist`, `/api/v2/addresses/:hash/transactions`, `/api/v2/blocks/:hash/transactions`. | Version: v11.0.0+ <br />Default: `false` <br />Applications: API |
| `DISABLE_TOKEN_TRANSFERS_BENS_PRELOAD` | If `true`, skips ENS name preloading in responses for token transfer list endpoints: `/api/v2/token-transfers`, `/api/v2/addresses/:hash/token-transfers`, `/api/v2/tokens/:address_hash_param/transfers`.                                                                                             | Version: v11.0.0+ <br />Default: `false` <br />Applications: API |

## Blockscout Account Abstraction

<Info>
  Enables the [User Ops Indexer](https://github.com/blockscout/blockscout-rs/tree/main/user-ops-indexer), a service designed to index, decode and serve user operations as per the ERC-4337 standard
</Info>

| Variable                                   | Description                                                                                                                                                                                                                         | Parameters                                                      |
| ------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `MICROSERVICE_ACCOUNT_ABSTRACTION_ENABLED` | If `true`, integration with [Blockscout Account Abstraction service](https://github.com/blockscout/blockscout-rs/tree/main/user-ops-indexer) is enabled. Implemented in [#9145](https://github.com/blockscout/blockscout/pull/9145) | Version: v6.1.0+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_ACCOUNT_ABSTRACTION_URL`     | URL of Blockscout ENS service. Implemented in [#9145](https://github.com/blockscout/blockscout/pull/9145)                                                                                                                           | Version: v6.1.0+ <br />Default: (empty) <br />Applications: API |

## Tx Interpreter (Summary) Service

| Variable                                          | Description                                                                                                                               | Parameters                                                      |
| ------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `MICROSERVICE_TRANSACTION_INTERPRETATION_ENABLED` | If `true`, integration with Tx Interpreter Service is enabled. Implemented in [#8957](https://github.com/blockscout/blockscout/pull/8957) | Version: v5.4.0+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_TRANSACTION_INTERPRETATION_URL`     | URL of Tx Interpreter Service. Implemented in [#8957](https://github.com/blockscout/blockscout/pull/8957)                                 | Version: v5.4.0+ <br />Default: (empty) <br />Applications: API |

## Metadata Service

| Variable                                       | Description                                                                                                                                 | Parameters                                                      |
| ---------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `MICROSERVICE_METADATA_ENABLED`                | If `true`, integration with Metadata Service is enabled. Implemented in [#9706](https://github.com/blockscout/blockscout/pull/9706)         | Version: v6.4.0+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_METADATA_URL`                    | URL of Metadata Service. Implemented in [#9706](https://github.com/blockscout/blockscout/pull/9706)                                         | Version: v6.4.0+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_METADATA_PROXY_REQUESTS_TIMEOUT` | Timeout for request forwarding from `/api/v2/proxy/metadata/`. Implemented in [#11656](https://github.com/blockscout/blockscout/pull/11656) | Version: v7.0.0+ <br />Default: `30s` <br />Applications: API   |

## Multichain Search Service

<Info>
  Multichain Search is the single point of search of the data in the all blockchains.
</Info>

| Variable                                                                            | Description                                                                                                                                                                                                                                                                       | Parameters                                                                |
| ----------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| `MICROSERVICE_MULTICHAIN_SEARCH_URL`                                                | Multichain Search Service API URL. Integration is enabled, if this variable value contains valid URL. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                                                                                | Version: v6.10.0+ <br />Default: (empty) <br />Applications: API, Indexer |
| `MICROSERVICE_MULTICHAIN_SEARCH_API_KEY`                                            | Multichain Search Service API key. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                                                                                                                                                   | Version: v6.10.0+ <br />Default: (empty) <br />Applications: API, Indexer |
| `MICROSERVICE_MULTICHAIN_SEARCH_ADDRESSES_CHUNK_SIZE`                               | Chunk size of addresses while exporting to Multichain Search DB. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377)                                                                                                                                     | Version: v8.1.0+ <br />Default: 7000 <br />Applications: API, Indexer     |
| `MICROSERVICE_MULTICHAIN_SEARCH_TOKEN_INFO_CHUNK_SIZE`                              | Chunk size of token info while exporting to Multichain Search DB. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867)                                                                                                                                    | Version: v9.0.0+ <br />Default: 1000 <br />Applications: Indexer          |
| `MICROSERVICE_MULTICHAIN_SEARCH_COUNTERS_CHUNK_SIZE`                                | Chunk size of counters while exporting to Multichain Search DB. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                                                     | Version: v9.1.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `MIGRATION_BACKFILL_MULTICHAIN_SEARCH_BATCH_SIZE`                                   | Batch size of backfilling Multichain Search Service DB. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                                                                                                                              | Version: v6.10.0+ <br />Default: 10 <br />Applications: Indexer           |
| `INDEXER_DISABLE_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_FETCHER`                    | If `true`, multichain DB main (blocks, transactions, addresses) export fetcher doesn't run. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                                                                                                         | Version: v9.0.0+ <br />Default: `false`<br />Applications: Indexer        |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_BATCH_SIZE`                         | Batch size for multichain DB main (blocks, transactions, addresses) export fetcher. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                                                                                                                 | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_CONCURRENCY`                        | Concurrency for multichain DB main (blocks, transactions, addresses) export fetcher. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                                                                                                                | Version: v9.0.0+ <br />Default: `10`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_ENQUEUE_BUSY_WAITING_TIMEOUT`       | Timeout before new attempt to append item to multichain DB main (blocks, transactions, addresses) export queue if it's full. [Time format](/setup/env-variables/backend-env-variables#time-format). Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377). | Version: v9.0.0+ <br />Default: `1s`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_MAX_QUEUE_SIZE`                     | Maximum size of multichain DB main (blocks, transactions, addresses) export queue. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                                                                                                                  | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_MAIN_QUEUE_INIT_QUERY_LIMIT`                   | Limit of the init query for processing the main export queue to the Multichain DB. Implemented in [#12822](https://github.com/blockscout/blockscout/pull/12822).                                                                                                                  | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_DISABLE_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_FETCHER`                | If `true`, multichain DB balances export fetcher doesn't run. Implemented in [#12580](https://github.com/blockscout/blockscout/pull/12580).                                                                                                                                       | Version: v9.0.0+ <br />Default: `false`<br />Applications: Indexer        |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_BATCH_SIZE`                     | Batch size for multichain DB balances export fetcher. Implemented in [#12580](https://github.com/blockscout/blockscout/pull/12580).                                                                                                                                               | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_CONCURRENCY`                    | Concurrency for multichain DB balances export fetcher. Implemented in [#12580](https://github.com/blockscout/blockscout/pull/12580).                                                                                                                                              | Version: v9.0.0+ <br />Default: `10`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_ENQUEUE_BUSY_WAITING_TIMEOUT`   | Timeout before new attempt to append item to multichain DB balances export queue if it's full. [Time format](/setup/env-variables/backend-env-variables#time-format). Implemented in [#12580](https://github.com/blockscout/blockscout/pull/12580).                               | Version: v9.0.0+ <br />Default: `1s`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_MAX_QUEUE_SIZE`                 | Maximum size of multichain DB balances export queue. Implemented in [#12580](https://github.com/blockscout/blockscout/pull/12580).                                                                                                                                                | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_BALANCES_QUEUE_INIT_QUERY_LIMIT`               | Limit of the init query for processing the balances export queue to the Multichain DB. Implemented in [#12822](https://github.com/blockscout/blockscout/pull/12822).                                                                                                              | Version: v9.0.0+ <br />Default: `1000` <br />Applications: Indexer        |
| `INDEXER_DISABLE_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_FETCHER`              | If `true`, multichain DB token info export fetcher doesn't run. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                                                                                                                                     | Version: v9.0.0+ <br />Default: `false`<br />Applications: Indexer        |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_BATCH_SIZE`                   | Batch size for multichain DB token info export fetcher. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                                                                                                                                             | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_CONCURRENCY`                  | Concurrency for multichain DB token info export fetcher. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                                                                                                                                            | Version: v9.0.0+ <br />Default: `10`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_ENQUEUE_BUSY_WAITING_TIMEOUT` | Timeout before new attempt to append item to multichain DB token info export queue if it's full. [Time format](/setup/env-variables/backend-env-variables#time-format). Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                             | Version: v9.0.0+ <br />Default: `1s`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_MAX_QUEUE_SIZE`               | Maximum size of multichain DB token info export queue. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                                                                                                                                              | Version: v9.0.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_TOKEN_INFO_QUEUE_INIT_QUERY_LIMIT`             | Limit of the init query for processing the token info export queue to the Multichain DB. Implemented in [#12867](https://github.com/blockscout/blockscout/pull/12867).                                                                                                            | Version: v9.0.0+ <br />Default: `1000` <br />Applications: Indexer        |
| `INDEXER_DISABLE_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_FETCHER`                | If `true`, multichain DB counters export fetcher doesn't run. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                                                       | Version: v9.1.0+ <br />Default: `false`<br />Applications: Indexer        |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_BATCH_SIZE`                     | Batch size for multichain DB counters export fetcher. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                                                               | Version: v9.1.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_CONCURRENCY`                    | Concurrency for multichain DB counters export fetcher. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                                                              | Version: v9.1.0+ <br />Default: `10`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_ENQUEUE_BUSY_WAITING_TIMEOUT`   | Timeout before new attempt to append item to multichain DB counters export queue if it's full. [Time format](/setup/env-variables/backend-env-variables#time-format). Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                               | Version: v9.1.0+ <br />Default: `1s`<br />Applications: Indexer           |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_MAX_QUEUE_SIZE`                 | Maximum size of multichain DB counters export queue. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                                                                | Version: v9.1.0+ <br />Default: `1000`<br />Applications: Indexer         |
| `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_COUNTERS_QUEUE_INIT_QUERY_LIMIT`               | Limit of the init query for processing the counters export queue to the Multichain DB. Implemented in [#13007](https://github.com/blockscout/blockscout/pull/13007).                                                                                                              | Version: v9.1.0+ <br />Default: `1000` <br />Applications: Indexer        |

## TAC Operation Lifecycle Service

| Variable                                       | Description                                                                                                                                                                                          | Parameters                                                      |
| ---------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `MICROSERVICE_TAC_OPERATION_LIFECYCLE_URL`     | TAC Operation Lifecycle Service API URL. Integration is enabled, if this variable value contains valid URL. Implemented in [#12367](https://github.com/blockscout/blockscout/pull/12367)             | Version: v8.1.0+ <br />Default: (empty) <br />Applications: API |
| `MICROSERVICE_TAC_OPERATION_LIFECYCLE_ENABLED` | If `false`, TAC Operation Lifecycle Service integration is disabled despite `MICROSERVICE_TAC_OPERATION_LIFECYCLE_URL`. Implemented in [#12367](https://github.com/blockscout/blockscout/pull/12367) | Version: v8.1.0+ <br />Default: `true` <br />Applications: API  |

## Sourcify

<Info>
  Allows for contract verification via [Sourcify](https://sourcify.dev/)
</Info>

| Variable                       | Description                                                     | Parameters                                                                                                                                                      |
| ------------------------------ | --------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `SOURCIFY_INTEGRATION_ENABLED` | Enables or disables verification of contracts through Sourcify. | Version: v5.1.3+ <br />Default: `false` <br />Applications: API                                                                                                 |
| `SOURCIFY_SERVER_URL`          | URL to Sourcify backend.                                        | Version: v3.7.0+ <br />Default: `https://sourcify.dev/server` <br />Applications: API                                                                           |
| `SOURCIFY_REPO_URL`            | URL to Sourcify repository with fully verified contracts.       | Version: v3.7.0+ <br />Default: `https://repo.sourcify.dev/contracts/` Before v3.7.1: `https://repo.sourcify.dev/contracts/full_match/` <br />Applications: API |

## Tenderly

| Variable              | Description                                                                                                                                                                                                                                                                   | Parameters                                                      |
| --------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `SHOW_TENDERLY_LINK`  | if `true`, Open in Tenderly" button is displayed on the transaction page. Implemented in [#4656](https://github.com/blockscout/blockscout/pull/4656)                                                                                                                          | Version: v4.0.0+ <br />Default: (empty) <br />Applications: API |
| `TENDERLY_CHAIN_PATH` | Chain path to the transaction in Tenderly. For instance, for transactions in xDai, Tenderly link looks like this `https://dashboard.tenderly.co/tx/xdai/0x...`, then `TENDERLY_CHAIN_PATH =/xdai.` Implemented in [#4656](https://github.com/blockscout/blockscout/pull/4656) | Version: v4.0.0+ <br />Default: (empty) <br />Applications: API |

## Datadog

<Info>
  Integration with the Datadog monitoring and analytics tools
</Info>

| Variable       | Description                                                                                     | Parameters                                                  |
| -------------- | ----------------------------------------------------------------------------------------------- | ----------------------------------------------------------- |
| `DATADOG_HOST` | Host configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/). | Version: all <br />Default: (empty) <br />Applications: API |
| `DATADOG_PORT` | Port configuration setting for [Datadog integration](https://docs.datadoghq.com/integrations/). | Version: all <br />Default: (empty) <br />Applications: API |

## Spandex

<Info>
  Spandex is a library for tracing Elixir applications
</Info>

| Variable                 | Description                                                                              | Parameters                                                  |
| ------------------------ | ---------------------------------------------------------------------------------------- | ----------------------------------------------------------- |
| `SPANDEX_BATCH_SIZE`     | [Spandex](https://github.com/spandex-project/spandex) and Datadog configuration setting. | Version: all <br />Default: (empty) <br />Applications: API |
| `SPANDEX_SYNC_THRESHOLD` | [Spandex](https://github.com/spandex-project/spandex) and Datadog configuration setting. | Version: all <br />Default: (empty) <br />Applications: API |

## Analytics

<Info>
  Variables for adding Mixpanel and/or amplitude for visitor analytics.
</Info>

| Variable            | Description                                                                                                                              | Parameters                                                                          |
| ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- |
| `MIXPANEL_TOKEN`    | [Mixpanel](https://mixpanel.com/) project token.                                                                                         | Needs Recompile: ☑️ Version: v5.0.0+ <br />Default: (empty) <br />Applications: API |
| `MIXPANEL_URL`      | Url to use Mixpanel with proxy ([Collection via Proxy](https://developer.mixpanel.com/docs/collection-via-a-proxy)).                     | Needs Recompile: ☑️ Version: v5.0.0+ <br />Default: (empty) <br />Applications: API |
| `AMPLITUDE_API_KEY` | [Amplitude](https://amplitude.com/) API key.                                                                                             | Needs Recompile: ☑️ Version: v5.0.0+ <br />Default: (empty) <br />Applications: API |
| `AMPLITUDE_URL`     | Url to use Amplitude with proxy ([Use Domain Proxy to Relay Events](https://www.docs.developers.amplitude.com/analytics/domain-proxy/)). | Needs Recompile: ☑️ Version: v5.0.0+ <br />Default: (empty) <br />Applications: API |

## Solidityscan

<Info>
  Enables security scoring for smart contracts
</Info>

<Frame caption>
  <img src="https://mintcdn.com/blockscout/JTppjXqh5Q4u166M/images/159daf66-image.jpeg?fit=max&auto=format&n=JTppjXqh5Q4u166M&q=85&s=ae1d21ada3ab4fbbadfbb3e737a06482" alt="" width="2304" height="1242" data-path="images/159daf66-image.jpeg" />
</Frame>

| Variable                   | Description                                                                                                                                                                                                                                                | Parameters                                                      |
| -------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| `SOLIDITYSCAN_PLATFORM_ID` | Internal platform id in [Solidityscan](https://apidoc.solidityscan.com/solidityscan-security-api/solidityscan-other-apis/quickscan-api-v1). Implemented in [#10473](https://github.com/blockscout/blockscout/pull/10473)                                   | Version: v6.8.0+ <br />Default: 16 <br />Applications: API      |
| `SOLIDITYSCAN_CHAIN_ID`    | Internal chain id in [Solidityscan](https://apidoc.solidityscan.com/solidityscan-security-api/solidityscan-other-apis/quickscan-api-v1). It may not match with actual chain ID. Implemented in [#8908](https://github.com/blockscout/blockscout/pull/8908) | Version: v5.3.3+ <br />Default: (empty) <br />Applications: API |
| `SOLIDITYSCAN_API_TOKEN`   | API token for usage of [Solidityscan API](https://apidoc.solidityscan.com/solidityscan-security-api/solidityscan-other-apis/quickscan-api-v1).                                                                                                             | Version: v5.3.3+ <br />Default: (empty) <br />Applications: API |

## Noves.fi

<Info>
  Adds additional transaction details such as summaries and asset flows. [More info here](https://www.blog.blockscout.com/better-blockchain-data-with-noves/).
</Info>

| Variable                | Description                                                                                                                                            | Parameters                                                                            |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------- |
| `NOVES_FI_BASE_API_URL` | [Noves.fi API](https://blockscout.noves.fi/swagger/index.html) base URL. Implemented in [#9056](https://github.com/blockscout/blockscout/pull/9056).   | Version: v6.1.0+ <br />Default: `https://blockscout.noves.fi` <br />Applications: API |
| `NOVES_FI_CHAIN_NAME`   | [Noves.fi API](https://blockscout.noves.fi/swagger/index.html) chain name. Implemented in [#9056](https://github.com/blockscout/blockscout/pull/9056). | Version: v6.1.0+ <br />Default: (empty) <br />Applications: API                       |
| `NOVES_FI_API_TOKEN`    | [Noves.fi API](https://blockscout.noves.fi/swagger/index.html) token. Implemented in [#9056](https://github.com/blockscout/blockscout/pull/9056).      | Version: v6.1.0+ <br />Default: (empty) <br />Applications: API                       |

## MUD framework

<Info>
  [The MUD framework](https://mud.dev/introduction) provides standardized tools for data retrieval, libraries and more.
</Info>

| Variable              | Description                                                                                                                                                                                               | Parameters                                                                                |
| --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- |
| `MUD_INDEXER_ENABLED` | If `true`, integration with [MUD](https://mud.dev/services/indexer#schemaless-indexing-with-postgresql-via-docker) is enabled. Implemented in [#9869](https://github.com/blockscout/blockscout/pull/9869) | Needs Recompile: ☑️ <br />Version: v6.6.0+ <br />Default: (empty) <br />Applications: API |
| `MUD_DATABASE_URL`    | MUD indexer DB connection URL.                                                                                                                                                                            | Version: v6.6.0+ <br />Default: value from `DATABASE_URL` <br />Applications: API         |
| `MUD_POOL_SIZE`       | MUD indexer DB `pool_size`                                                                                                                                                                                | Version: v6.6.0+ <br />Default: `50` <br />Applications: API                              |

## Xname app

<Info>
  Enables Xname app integration, which includes humanity score displayment.
</Info>

| Variable             | Description                                                                                                             | Parameters                                                                          |
| -------------------- | ----------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- |
| `XNAME_BASE_API_URL` | [Xname API](https://xname.app/) base URL. Implemented in [#11010](https://github.com/blockscout/blockscout/pull/11010). | Version: v6.9.2+ <br />Default: `https://gateway.xname.app` <br />Applications: API |
| `XNAME_API_TOKEN`    | [Xname API](https://xname.app/) token. Implemented in [#11010](https://github.com/blockscout/blockscout/pull/11010).    | Version: v6.9.2+ <br />Default: (empty) <br />Applications: API                     |

## Stylus contract verifier

<Info>
  Connecting to the Stylus smart contract verification service
</Info>

| Variable                           | Description                                                                                                                                                                                                                                                            | Parameters                                                       |
| ---------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- |
| `MICROSERVICE_STYLUS_VERIFIER_URL` | URL of Stylus verifier. If set valid url and `CHAIN_TYPE=arbitrum`, integration with [Stylus verifier](https://github.com/blockscout/blockscout-rs/tree/main/stylus-verifier) is enabled. Implemented in [#11183](https://github.com/blockscout/blockscout/pull/11183) | Version: v6.10.0+ <br />Default: (empty) <br />Applications: API |