ENV Variables

Variable

Required

Description

Default

Version

Need recompile

NETWORK

✅

Environment variable for the main EVM network such as Ethereum or POA

POA

all

​

SUBNETWORK

✅

Environment variable for the subnetwork such as Core or Sokol Network. This will be displayed as selected in the chains list dropdown.

POA Sokol

all

​

LOGO

✅

Environment variable for the header logo image location. The logo files names for different chains can be found here​

/images/blockscout_logo.svg

all

​

LOGO_FOOTER

✅

Environment variable for the footer logo image location. The logo files names for different chains can be found here​

/images/blockscout_logo.svg

​

​

ETHEREUM_JSONRPC_VARIANT

✅

Tells the application which RPC Client the node is using (i.e. geth, parity, besu, or ganache) (See Client Settings for more info)

parity

all

​

ETHEREUM_JSONRPC_HTTP_URL

✅

The RPC endpoint used to fetch blocks, transactions, receipts, tokens.

localhost:8545

all

​

ETHEREUM_JSONRPC_TRACE_URL

​

The RPC endpoint specifically for the Geth/Parity/Besu client used by trace_block and trace_replayTransaction. This can be used to designate a tracing node.

localhost:8545

all

​

ETHEREUM_JSONRPC_WS_URL

✅

The WebSockets RPC endpoint used to subscribe to the newHeads subscription alerting the indexer to fetch new blocks.

ws://localhost:8546

all

​

ETHEREUM_JSONRPC_TRANSPORT

​

Specifies the transport for Blockscout to connect to the Ethereum Node. Available transports are http and ipc. If ipc is selected, also set IPC_PATH variable

http

v3.1.0+

​

IPC_PATH

​

Path to the IPC file of the running node if IPC transport is chosen

(empty)

v2.1.1+

​

NETWORK_PATH

​

Used to set a network path other than what is displayed in the root directory. An example would be to add /eth/mainnet/ to the root directory.

/

all

​

API_PATH

​

PATH in API endpoint URL at API docs page

/

v3.1.0+

​

SOCKET_ROOT

​

Custom websocket path

(empty)

v3.0.0+

​

BLOCKSCOUT_HOST

​

Host for API endpoint examples

localhost

v2.1.0+

​

BLOCKSCOUT_PROTOCOL

​

Url scheme for blockscout

in prod env https is used, in dev env http is used

v2.1.0+

​

SECRET_KEY_BASE

✅

Use mix phx.gen.secret to generate a new Secret Key Base string to protect production assets.

(empty)

all

​

CHECK_ORIGIN

​

Used to check the origin of requests when the origin header is present. It defaults to false. In case of true, it will check against the host value.

false

all

​

PORT

✅

Default port the application runs on is 4000

4000

all

​

COIN

✅

The coin here is checked via the CoinGecko API to obtain USD prices on graphs and other areas of the UI

POA

all

​

COINGECKO_COIN_ID

​

Explicitly set CoinGecko coin ID

(empty)

v3.1.2+

​

METADATA_CONTRACT

​

This environment variable is specifically used by POA Network to obtain Validators information to display in the UI.

(empty)

all

​

VALIDATORS_CONTRACT

​

This environment variable is specifically used by POA Network to obtain the list of current validators.

(empty)

all

​

KEYS_MANAGER_CONTRACT

​

This environment variable is specifically used by POA Network to set KeysManager proxy contract in order to obtain payout key by mining key. This need to identify distributed reward to the validator.

(empty)

v3.1.2+

​

REWARDS_CONTRACT

​

Emission rewards contract address. This env var is used only if EMISSION_FORMAT is set to POA

0xeca443e8e1ab29971a45a9c57a6a9875701698a5

v2.0.4+

​

TOKEN_BRIDGE_CONTRACT

​

Token bridge proxy contract. For `TokenBridge` supply module.

0x7301CFA0e1756B71869E93d4e4Dca5c7d0eb0AA6

v1.3.2+

​

EMISSION_FORMAT

​

Should be set to POA if you have block emission identical to POA Network. This env var is used only if CHAIN_SPEC_PATH is set

DEFAULT

v2.0.4+

​

CHAIN_SPEC_PATH

​

Chain specification path (absolute file system path or URL) to import block emission reward ranges and genesis account balances from. Geth- and OpenEthereum-style specs are supported.

(empty)

v2.0.4+

​

SUPPLY_MODULE

​

This environment variable is used by the xDai Chain/RSK in order to tell the application how to calculate the total supply of the chain. Available values are TokenBridge, RSK

(empty)

all

​

SOURCE_MODULE

​

This environment variable is used to calculate the exchange rate and is specifically used by the xDai Chain. Available value is TokenBridge

(empty)

all

​

DATABASE_URL

✅

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​

(empty)

all

​

DATADOG_PORT

​

Port configuration setting for Datadog integration.

(empty}

all

​

SPANDEX_BATCH_SIZE

​

​Spandex and Datadog configuration setting.

(empty)

all

​

SPANDEX_SYNC_THRESHOLD

​

​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

​

HEART_COMMAND

​

Production environment variable to restart the application in the event of a crash.

systemctl restart explorer.service

all

​

BLOCKSCOUT_VERSION

​

Added to the footer to signify the current BlockScout version.

(empty)

v1.3.4+

​

RELEASE_LINK

​

The link to Blockscout release notes in the footer.

https: //github.com/poanetwork/ blockscout/releases/ tag/${BLOCKSCOUT_VERSION}

v1.3.5+

​

ELIXIR_VERSION

​

Elixir version to install on the node before Blockscout deploy. It is used in bash script in Terraform / Ansible deployment script

(empty)

all

​

BLOCK_TRANSFORMER

​

Transformer for blocks: base or clique.

base

v1.3.4+

​

GRAPHIQL_TRANSACTION

​

Default transaction hash in a sample query to GraphiQL.

(empty)

v1.2.0+

✅

FIRST_BLOCK

​

The block number, where indexing begins from.

0

v1.3.8+

​

LAST_BLOCK

​

The block number, where indexing stops.

(empty)

v2.0.3+

​

LINK_TO_OTHER_EXPLORERS

​

true/false. If true, links to other explorers are added in the footer

(empty)

v1.3.0+

​

OTHER_EXPLORERS

​

The list of alternative explorers. This env var was introduced in PR #3414.

(empty)

v3.4.0+

​

SUPPORTED_CHAINS

​

An array of supported chains that display in the footer and in the chains dropdown. This var was introduced in this PR #1900 and looks like an array of JSON objects.

(empty)

v2.0.0+

​

BLOCK_COUNT_CACHE_PERIOD

​

time to live of blocks with consensus count cache in seconds. This var was introduced in #1876​

2 hours

v2.0.0+

​

TXS_COUNT_CACHE_PERIOD

​

Interval in seconds to restart the task, which calculates the total txs count.

2 hours

v1.3.9+

​

ADDRESS_COUNT_CACHE_PERIOD

​

time to live of cache in seconds. This var was introduced in #2822​

2 hours

v2.1.1+

​

ADDRESS_SUM_CACHE_PERIOD

​

time to live of addresses sum (except burn address) cache in seconds. This var was introduced in #2862​

1 hour

v2.1.1+

​

TOTAL_GAS_USAGE_CACHE_PERIOD

​

Interval in seconds to restart the task, which calculates the total gas usage.

2 hours

v3.4.0+

​

ADDRESS_TRANSACTIONS_GAS_USAGE_COUNTER_CACHE_PERIOD

​

Interval in seconds to restart the task, which calculates gas usage at the address.

30 minutes

v3.4.0+

​

TOKEN_HOLDERS_COUNTER_CACHE_PERIOD

​

Interval in seconds to restart the task, which calculates holders count of the token.

1 hour

v3.4.0+

​

TOKEN_TRANSFERS_COUNTER_CACHE_PERIOD

​

Interval in seconds to restart the task, which calculates transfers count of the token.

1 hour

v3.4.0+

​

ADDRESS_WITH_BALANCES_UPDATE_INTERVAL

​

Interval in seconds to restart the task, which calculates addresses with balances.

30 minutes

v1.3.9+

​

TOKEN_METADATA_UPDATE_INTERVAL

​

Interval in seconds to restart the task which updates token metadata

60 * 60 * 24 * 2

v2.0.1+

​

AVERAGE_BLOCK_CACHE_PERIOD

​

Update of average block period cache, in seconds

30 minutes

v2.0.2+

​

MARKET_HISTORY_CACHE_PERIOD

​

Update of market history cache, in seconds

6 hours

v2.0.2+

​

ALLOWED_EVM_VERSIONS

​

the comma-separated list of allowed EVM versions for contracts verification. This var was introduced in #1964​

"homestead, tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg"

v2.0.0+

​

UNCLES_IN_AVERAGE_BLOCK_TIME

​

Include or exclude non-consensus blocks in avg block time calculation. Exclude if false.

false

v2.0.1+

​

DISABLE_WEBAPP

​

If true, endpoints to webapp are hidden (compile-time). Also, enabling it makes notifications go through db_notify

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. protocol://host/path

(empty)

v2.0.3+

​

API_URL

​

Link to API instance, e.g. protocol://host/path

(empty)

v2.0.3+

​

WOBSERVER_ENABLED

​

If true enables wobserver interface

(empty)

v3.3.2+

✅

SHOW_ADDRESS_MARKETCAP_PERCENTAGE

​

Configures market cap percentage column on the top accounts page

true

v2.1.1+

​

CHECKSUM_ADDRESS_HASHES

​

If set to true, redirects to checksummed version of address hashes

true

v3.1.0+

​

CHECKSUM_FUNCTION

​

Defines checksum address function. 2 available values: rsk, eth

eth

v2.0.1+

​

DISABLE_EXCHANGE_RATES

​

Disables or enables fetching of coin price from Coingecko API

false

v3.1.2+

​

DISABLE_KNOWN_TOKENS

​

Disables or enables token symbol for known contract

false

v3.4.0+

​

ENABLE_TXS_STATS

​

Disables or enables txs per day stats gathering

false

v3.1.2+

​

SHOW_PRICE_CHART

​

Disables or enables price and market cap of coin charts on the main page

false

v3.1.2+

​

SHOW_TXS_CHART

​

Disables or enables txs count per day chart on the main page

false

v3.1.2+

​

HISTORY_FETCH_INTERVAL

​

Interval in minutes how often to request count of txs per current day in order to display txs count per day chart on the main page

60

v3.1.2+

​

TXS_HISTORIAN_INIT_LAG

​

The initial delay in minutes in txs count history fetching in order to display txs count per day history chart on the main page

0

v3.1.2+

​

TXS_STATS_DAYS_TO_COMPILE_AT_INIT

​

Number of days for fetching of history of txs count per day in order to display it in txs count per day history chart on the main page

365

v3.1.2+

​

COIN_BALANCE_HISTORY_DAYS

​

Number of days to consider at coin balance history chart

10

v3.1.3+

​

APPS_MENU

​

true/false. If true, the Apps navigation menu item appears

false

v3.3.1+

​

EXTERNAL_APPS

​

An array of external apps to display in Apps menu item. This var was introduced in this PR #3184 and looks like an array of JSON objects.

(empty)

v3.3.1+

​

OMNI_BRIDGE_MEDIATOR

​

An address of OmniBridge mediator to bridge multiple tokens. Providing this address enables bridged tokens functionality: bridged status and link to the original token in the foreign chain.

(empty)

v3.3.2+

​

AMB_BRIDGE_MEDIATORS

​

A comma-separated list of AMB extensions' mediators' addresses' hashes to fetch bridged tokens through those mediators.

(empty)

v3.3.3+

​

GAS_PRICE

​

Gas price in Gwei. If the variable is present, gas price displays at the main page

(empty)

v3.3.2+

​

FOREIGN_JSON_RPC

​

JSON RPC endpoint to the foreign chain in order to get metadata of bridged through Omni-bridge token. It was introduced in this PR #3282​

(empty)

v3.3.3+

​

BRIDGE_MARKET_CAP_UPDATE_INTERVAL

​

Market cap update interval for `TokenBridge` supply module as for TokenBridge and for OmniBridge as well, in seconds. It was introduced in this PR #3293​

30 minutes

v3.3.3+

​

RESTRICTED_LIST

​

A comma-separated list of addresses to enable restricted access on them

(empty)

v3.3.3+

​

RESTRICTED_LIST_KEY

​

A key to access addresses listed inRESTRICTED_LIST variable. Can be passed via query param to the page's URL: ?key=...

(empty)

v3.3.3+

​

ADDRESS_TRANSACTIONS_CACHE_PERIOD

​

time to live of address' transactions counter in seconds. This var was introduced in #3330​

1 hour

v3.4.0+

​

DISABLE_BRIDGE_MARKET_CAP_UPDATER

​

Disables recurring consolidation of TokenBridge market cap from TokenBridge, OmniBridge and AMB extensions

(empty)

v3.3.3+

​

POS_STAKING_CONTRACT

​

The address of POSDAO staking contract. When provided, enables staking DApp. ValidatorSet and BlockReward contract addresses are fetched using corresponding getters.

(empty)

v3.4.0+

​

TOKEN_EXCHANGE_RATE_CACHE_PERIOD

​

Managing of cache invalidation for token's exchange rate.

(empty)

v3.5.0+

​

ADDRESS_TOKENS_USD_SUM_CACHE_PERIOD

​

Managing of cache invalidation period for the sum of USD value of tokens per tokens' holder address

(empty)

v3.5.0+

​