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Blockchain explorer for Ethereum based network and a tool for inspecting and analyzing EVM based blockchains.
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blockscout/docs/env-variables.md

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BlockScout Env Variables

Below is a table outlining the environment variables utilized by BlockScout.

Notes:

  • This table is horizontally scrollable, version information is located in the last column.
  • Settings related to the ETHEREUM_JSONRPC_VARIANT variable and client related settings for running a full archive node with geth or parity are located in this forum post.
  • Additional information related to certain variables is available on the ansible deployment page.
  • To set variables using the CLI, use the export command. For example:
$ export ETHEREUM_JSONRPC_VARIANT=parity
$ export COIN=POA
$ export NETWORK=POA
Variable Required Description Default Version
NETWORK ✅ Environment variable for the main EVM network such as Ethereum Network or POA Network POA Network all
SUBNETWORK ✅ Environment variable for the subnetwork such as Core or Sokol Network Sokol Testnet all
NETWORK_ICON ✅ Environment variable for the main network icon or testnet icon. Two options are _test_network_icon.html and _network_icon.html _test_network_icon.html all
LOGO ✅ Environment variable for the logo image location. The logo files names for different chains can be found here /images/blockscout_logo.svg all
ETHEREUM_JSONRPC_VARIANT ✅ This environment variable is used to tell the application which RPC Client the node is using (i.e. Geth, Parity, or Ganache) 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 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
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. (empty) all
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 Coinmarketcap API to obtain USD prices on graphs and other areas of the UI POA all
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 Emission Fund contract. (empty) all
SUPPLY_MODULE This environment variable is used by the xDai Chain in order to tell the application how to calculate the total supply of the chain. false all
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 (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. (empty) all
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) 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
_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+
COINMARKETCAP_PAGES the number of pages on coinmarketcap to list in order to find token's price 10 v1.3.10+
CHAIN_SPEC_PATH Chain specification path (absolute file system path or url) to import block emission reward ranges and genesis account balances from (empty) master
EMISSION_FORMAT Should be set to POA if you have block emission indentical to POA Network. This env var is used only if CHAIN_SPEC_PATH is set STANDARD master
REWARDS_CONTRACT_ADDRESS Emission rewards contract address. This env var is used only if EMISSION_FORMAT is set to POA 0xeca443e8e1ab29971a45a9c57a6a9875701698a5 master
SUPPORTED_CHAINS Array of supported chains that displays 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 cache in seconds. This var was introduced in #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 "homestead, tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg" v2.0.0+
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+