ENVS.md

Run-time environment variables

The app instance can be customized by passing the following variables to the Node.js environment at runtime. Some of these variables have been deprecated, and their full list can be found in the file.

IMPORTANT NOTE! For production build purposes all json-like values should be single-quoted. If it contains a hash (#) or a dollar-sign ($) the whole value should be wrapped in single quotes as well (see dotenv readme for the reference)

Disclaimer about using variables

Please be aware that all environment variables prefixed with NEXT_PUBLIC_ will be exposed to the browser. So any user can obtain its values. Make sure that for all 3rd-party services keys (e.g., Sentri, Auth0, WalletConnect, etc.) in the services administration panel you have created a whitelist of allowed origins and have added your app domain into it. That will help you prevent using your key by unauthorized app, if someone gets its value.

 

Table of contents

• App configuration
• Blockchain parameters
• API configuration
• UI configuration
  • Homepage
  • Navigation
  • Footer
  • Favicon
  • Meta
  • Views
    • Block
    • Address
    • Transaction
    • NFT
  • Misc
• App features
  • My account
  • Gas tracker
  • Address verification in "My account"
  • Blockchain interaction (writing to contract, etc.)
  • Banner ads
  • Text ads
  • Beacon chain
  • User operations
  • Rollup chain
  • Export data to CSV file
  • Google analytics
  • Mixpanel analytics
  • GrowthBook feature flagging and A/B testing
  • GraphQL API documentation
  • REST API documentation
  • Marketplace
  • Solidity to UML diagrams
  • Blockchain statistics
  • Web3 wallet integration (add token or network to the wallet)
  • Transaction interpretation
  • Verified tokens info
  • Name service integration
  • Metadata service integration
  • Public tag submission
  • Data availability
  • Bridged tokens
  • Safe{Core} address tags
  • SUAVE chain
  • MetaSuites extension
  • Validators list
  • Sentry error monitoring
  • OpenTelemetry
  • DeFi dropdown
  • Multichain balance button
  • Get gas button
  • Save on gas with GasHawk
• 3rd party services configuration

 

App configuration

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_APP_PROTOCOL	http | https	App url schema	-	https	http	v1.0.x+
NEXT_PUBLIC_APP_HOST	string	App host	Required	-	blockscout.com	v1.0.x+
NEXT_PUBLIC_APP_PORT	number	Port where app is running	-	3000	3001	v1.0.x+
NEXT_PUBLIC_USE_NEXT_JS_PROXY	boolean	Tells the app to proxy all APIs request through the NextJS app. We strongly advise not to use it in the production environment, since it can lead to performance issues of the NodeJS server	-	false	true	v1.8.0+

 

Blockchain parameters

Note! The NEXT_PUBLIC_NETWORK_CURRENCY variables represent the blockchain's native token used for paying transaction fees. NEXT_PUBLIC_NETWORK_SECONDARY_COIN variables refer to tokens like protocol-specific tokens (e.g., OP token on Optimism chain) or governance tokens (e.g., GNO on Gnosis chain).

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_NETWORK_NAME	string	Displayed name of the network	Required	-	Gnosis Chain	v1.0.x+
NEXT_PUBLIC_NETWORK_SHORT_NAME	string	Used for SEO attributes (e.g, page description)	-	-	OoG	v1.0.x+
NEXT_PUBLIC_NETWORK_ID	number	Chain id, see https://chainlist.org for the reference	Required	-	99	v1.0.x+
NEXT_PUBLIC_NETWORK_RPC_URL	string	Chain public RPC server url, see https://chainlist.org for the reference	-	-	https://core.poa.network	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_NAME	string	Network currency name	-	-	Ether	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_WEI_NAME	string	Name of network currency subdenomination	-	wei	duck	v1.23.0+
NEXT_PUBLIC_NETWORK_CURRENCY_SYMBOL	string	Network currency symbol	-	-	ETH	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_DECIMALS	string	Network currency decimals	-	18	6	v1.0.x+
NEXT_PUBLIC_NETWORK_SECONDARY_COIN_SYMBOL	string	Network secondary coin symbol.	-	-	GNO	v1.29.0+
NEXT_PUBLIC_NETWORK_MULTIPLE_GAS_CURRENCIES	boolean	Set to true for networks where users can pay transaction fees in either the native coin or ERC-20 tokens.	-	false	true	v1.33.0+
NEXT_PUBLIC_NETWORK_VERIFICATION_TYPE	validation | mining	Verification type in the network. Irrelevant for Arbitrum (verification type is always posting) and ZkEvm (verification type is always sequencing) L2s	-	mining	validation	v1.0.x+
NEXT_PUBLIC_NETWORK_TOKEN_STANDARD_NAME	string	Name of the standard for creating tokens	-	ERC	BEP	v1.31.0+
NEXT_PUBLIC_IS_TESTNET	boolean	Set to true if network is testnet	-	false	true	v1.0.x+

 

API configuration

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_API_PROTOCOL	http | https	Main API protocol	-	https	http	v1.0.x+
NEXT_PUBLIC_API_HOST	string	Main API host	Required	-	blockscout.com	v1.0.x+
NEXT_PUBLIC_API_PORT	number	Port where API is running on the host	-	-	3001	v1.0.x+
NEXT_PUBLIC_API_BASE_PATH	string	Base path for Main API endpoint url	-	-	/poa/core	v1.0.x+
NEXT_PUBLIC_API_WEBSOCKET_PROTOCOL	ws | wss	Main API websocket protocol	-	wss	ws	v1.0.x+

 

UI configuration

Homepage

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_HOMEPAGE_CHARTS	Array<'daily_txs' | 'coin_price' | 'secondary_coin_price' | 'market_cap' | 'tvl'>	List of charts displayed on the home page	-	-	['daily_txs','coin_price','market_cap']	v1.0.x+
NEXT_PUBLIC_HOMEPAGE_STATS	Array<'latest_batch' | 'total_blocks' | 'average_block_time' | 'total_txs' | 'latest_l1_state_batch' | 'wallet_addresses' | 'gas_tracker' | 'btc_locked' | 'current_epoch'>	List of stats widgets displayed on the home page	-	For zkSync, zkEvm and Arbitrum rollups: ['latest_batch','average_block_time','total_txs','wallet_addresses','gas_tracker'], for other cases: ['total_blocks','average_block_time','total_txs','wallet_addresses','gas_tracker']	['total_blocks','total_txs','wallet_addresses']	v1.35.x+
NEXT_PUBLIC_HOMEPAGE_PLATE_TEXT_COLOR	string	Text color of the hero plate on the homepage (escape "#" symbol if you use HEX color codes or use rgba-value instead). DEPRECATED Use NEXT_PUBLIC_HOMEPAGE_HERO_BANNER_CONFIG instead	-	white	\#DCFE76	v1.0.x+
NEXT_PUBLIC_HOMEPAGE_PLATE_BACKGROUND	string	Background css value for hero plate on the homepage (escape "#" symbol if you use HEX color codes or use rgba-value instead). DEPRECATED Use NEXT_PUBLIC_HOMEPAGE_HERO_BANNER_CONFIG instead	-	radial-gradient(103.03% 103.03% at 0% 0%, rgba(183, 148, 244, 0.8) 0%, rgba(0, 163, 196, 0.8) 100%), var(--chakra-colors-blue-400)	radial-gradient(at 15% 86%, hsla(350,65%,70%,1) 0px, transparent 50%) | no-repeat bottom 20% right 0px/100% url(https://placekitten/1400/200)	v1.1.0+
NEXT_PUBLIC_HOMEPAGE_HERO_BANNER_CONFIG	HeroBannerConfig, see details below	Configuration of hero banner appearance.	-	-	See below	v1.35.0+

Hero banner configuration properties

Note Here, all values are arrays of up to two strings. The first string represents the value for the light color mode, and the second string represents the value for the dark color mode. If the array contains only one string, it will be used for both color modes.

Variable	Type	Description	Compulsoriness	Default value	Example value
background	[string, string]	Banner background (could be a solid color, gradient or picture). The string should be a valid background CSS property value.	-	['radial-gradient(103.03% 103.03% at 0% 0%, rgba(183, 148, 244, 0.8) 0%, rgba(0, 163, 196, 0.8) 100%), var(--chakra-colors-blue-400)']	['lightpink','no-repeat bottom 20% right 0px/100% url(https://placekitten/1400/200)']
text_color	[string, string]	Banner text background. The string should be a valid color CSS property value.	-	['white']	['lightpink','#DCFE76']
border	[string, string]	Banner border. The string should be a valid border CSS property value.	-	-	['1px solid yellow','4px dashed #DCFE76']
button	Partial<Record<'_default' | '_hover' | '_selected', {'background'?: [string, string]; 'text_color?:[string, string]'}>>	The button on the banner. It has three possible states: _default, _hover, and _selected. The _selected state reflects when the user is logged in or their wallet is connected to the app.	-	-	{'_default':{'background':['deeppink'],'text_color':['white']}}

 

Navigation

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_NETWORK_LOGO	string	Network logo; if not provided, placeholder will be shown; Note the logo height should be 24px and width less than 120px	-	-	https://placekitten.com/240/40	v1.0.x+
NEXT_PUBLIC_NETWORK_LOGO_DARK	string	Network logo for dark color mode; if not provided, inverted regular logo will be used instead	-	-	https://placekitten.com/240/40	v1.0.x+
NEXT_PUBLIC_NETWORK_ICON	string	Network icon; used as a replacement for regular network logo when nav bar is collapsed; if not provided, placeholder will be shown; Note the icon size should be at least 60px by 60px	-	-	https://placekitten.com/60/60	v1.0.x+
NEXT_PUBLIC_NETWORK_ICON_DARK	string	Network icon for dark color mode; if not provided, inverted regular icon will be used instead	-	-	https://placekitten.com/60/60	v1.0.x+
NEXT_PUBLIC_FEATURED_NETWORKS	string	URL of configuration file (.json format only) or file content string representation. It contains list of featured networks that will be shown in the network menu. See below list of available properties for particular network	-	-	https://example.com/featured_networks_config.json | [{'title':'Astar(EVM)','url':'https://astar.blockscout.com/','group':'Mainnets','icon':'https://example.com/astar.svg'}]	v1.0.x+
NEXT_PUBLIC_OTHER_LINKS	Array<{url: string; text: string}>	List of links for the "Other" navigation menu	-	-	[{'url':'https://blockscout.com','text':'Blockscout'}]	v1.0.x+
NEXT_PUBLIC_NAVIGATION_HIDDEN_LINKS	Array<LinkId>	List of external links hidden in the navigation. Supported ids are eth_rpc_api, rpc_api	-	-	['eth_rpc_api']	v1.16.0+
NEXT_PUBLIC_NAVIGATION_HIGHLIGHTED_ROUTES	Array<string>	List of menu item routes that should have a lightning label	-	-	['/accounts']	v1.31.0+
NEXT_PUBLIC_NAVIGATION_LAYOUT	vertical | horizontal	Navigation menu layout type	-	vertical	horizontal	v1.32.0+

Featured network configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
title	string	Displayed name of the network	Required	-	Gnosis Chain
url	string	Network explorer main page url	Required	-	https://blockscout.com/xdai/mainnet
group	Mainnets | Testnets | Other	Indicates in which tab network appears in the menu	Required	-	Mainnets
icon	string	Network icon; if not provided, the common placeholder will be shown; Note that icon size should be at least 60px by 60px	-	-	https://placekitten.com/60/60
isActive	boolean	Pass true if item should be shown as active in the menu	-	-	true
invertIconInDarkMode	boolean	Pass true if icon colors should be inverted in dark mode	-	-	true

 

Footer

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_FOOTER_LINKS	string	URL of configuration file (.json format only) or file content string representation. It contains list of link groups to be displayed in the footer. See below list of available properties for particular group	-	-	https://example.com/footer_links_config.json | [{'title':'My chain','links':[{'text':'About','url':'https://example.com/about'},{'text':'Contacts','url':'https://example.com/contacts'}]}]	v1.1.1+

The app version shown in the footer is derived from build-time ENV variables NEXT_PUBLIC_GIT_TAG and NEXT_PUBLIC_GIT_COMMIT_SHA and cannot be overwritten at run-time.

Footer links configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
title	string	Title of link group	Required	-	Company
links	Array<{'text':string;'url':string;}>	list of links	Required	-	[{'text':'Homepage','url':'https://www.blockscout.com'}]

 

Favicon

By default, the app has generic favicon. You can override this behavior by providing the following variables. Hence, the favicon assets bundle will be generated at the container start time and will be used instead of default one.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
FAVICON_GENERATOR_API_KEY	string	RealFaviconGenerator API key	Required	-	<your-secret>	v1.16.0+
FAVICON_MASTER_URL	string	-	-	NEXT_PUBLIC_NETWORK_ICON	https://placekitten.com/180/180	v1.11.0+

 

Meta

Settings for meta tags, OG tags and SEO

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_PROMOTE_BLOCKSCOUT_IN_TITLE	boolean	Set to true to promote Blockscout in meta and OG titles	-	true	true	v1.12.0+
NEXT_PUBLIC_OG_DESCRIPTION	string	Custom OG description	-	-	Blockscout is the #1 open-source blockchain explorer available today. 100+ chains and counting rely on Blockscout data availability, APIs, and ecosystem tools to support their networks.	v1.12.0+
NEXT_PUBLIC_OG_IMAGE_URL	string	OG image url. Minimum image size is 200 x 20 pixels (recommended: 1200 x 600); maximum supported file size is 8 MB; 2:1 aspect ratio; supported formats: image/jpeg, image/gif, image/png	-	static/og_placeholder.png	https://placekitten.com/1200/600	v1.12.0+
NEXT_PUBLIC_OG_ENHANCED_DATA_ENABLED	boolean	Set to true to populate OG tags (title, description) with API data for social preview robot requests	-	false	true	v1.29.0+
NEXT_PUBLIC_SEO_ENHANCED_DATA_ENABLED	boolean	Set to true to pre-render page titles (e.g Token page) on the server side and inject page h1-tag to the markup before it is sent to the browser.	-	false	true	v1.30.0+

 

Views

Block views

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VIEWS_BLOCK_HIDDEN_FIELDS	Array<BlockFieldId>	Array of the block fields ids that should be hidden. See below the list of the possible id values.	-	-	'["burnt_fees","total_reward"]'	v1.10.0+

Block fields list

Id	Description
burnt_fees	Burnt fees
total_reward	Total block reward
nonce	Block nonce
miner	Address of block's miner or validator
L1_status	Short interpretation of the batch lifecycle (applicable for Rollup chains)
batch	Batch index (applicable for Rollup chains)

 

Address views

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VIEWS_ADDRESS_IDENTICON_TYPE	"github" | "jazzicon" | "gradient_avatar" | "blockie" | "universal_profile|[identicon]	Type of identicon displayed next to addresses. In case of universal_profile you can provide a second identicon type that will be displayed when no universal profile is found	Style of address identicon appearance. Choose between GitHub, Metamask Jazzicon, Gradient Avatar, Ethereum Blocky and LUKSO Universal Profile	-	jazzicon	gradient_avatar
NEXT_PUBLIC_VIEWS_ADDRESS_HIDDEN_VIEWS	Array<AddressViewId>	Address views that should not be displayed. See below the list of the possible id values.	-	-	'["top_accounts"]'	v1.15.0+
NEXT_PUBLIC_VIEWS_CONTRACT_SOLIDITYSCAN_ENABLED	boolean	Set to true if SolidityScan reports are supported	-	-	true	v1.19.0+
NEXT_PUBLIC_VIEWS_CONTRACT_EXTRA_VERIFICATION_METHODS	Array<'solidity-hardhat' | 'solidity-foundry'>	Pass an array of additional methods from which users can choose while verifying a smart contract. Both methods are available by default, pass 'none' string to disable them all.	-	-	['solidity-hardhat']	v1.33.0+
NEXT_PUBLIC_GRAPH_URL	string	URL of LUKSO Graph Indexer	-	-	https://envio.mainnet.lukso.dev/	-

Address views list

Id	Description
top_accounts	Top accounts

 

Transaction views

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VIEWS_TX_HIDDEN_FIELDS	Array<TxFieldsId>	Array of the transaction fields ids that should be hidden. See below the list of the possible id values.	-	-	'["value","tx_fee"]'	v1.15.0+
NEXT_PUBLIC_VIEWS_TX_ADDITIONAL_FIELDS	Array<TxAdditionalFieldsId>	Array of the additional fields ids that should be added to the transaction details. See below the list of the possible id values.	-	-	'["fee_per_gas"]'	v1.15.0+

Transaction fields list

Id	Description
value	Sent value
fee_currency	Fee currency
gas_price	Price per unit of gas
tx_fee	Total transaction fee
gas_fees	Gas fees breakdown
burnt_fees	Amount of native coin burnt for transaction
L1_status	Short interpretation of the batch lifecycle (applicable for Rollup chains)
batch	Batch index (applicable for Rollup chains)

Transaction additional fields list

Id	Description
fee_per_gas	Amount of total fee divided by total amount of gas used by transaction

 

NFT views

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VIEWS_NFT_MARKETPLACES	Array<NftMarketplace> where NftMarketplace can have following properties	Used to build up links to NFT collections and NFT instances in external marketplaces.	-	-	[{'name':'OpenSea','collection_url':'https://opensea.io/assets/ethereum/{hash}','instance_url':'https://opensea.io/assets/ethereum/{hash}/{id}','logo_url':'https://opensea.io/static/images/logos/opensea-logo.svg'}]	v1.15.0+

NFT marketplace properties

Variable	Type	Description	Compulsoriness	Default value	Example value
name	string	Displayed name of the marketplace	Required	-	OpenSea
collection_url	string	URL template for NFT collection	Required	-	https://opensea.io/assets/ethereum/{hash}
instance_url	string	URL template for NFT instance	Required	-	https://opensea.io/assets/ethereum/{hash}/{id}
logo_url	string	URL of marketplace logo	Required	-	https://opensea.io/static/images/logos/opensea-logo.svg

Note URL templates should contain placeholders of NFT hash ({hash}) and NFT id ({id}). This placeholders will be substituted with particular values for every collection or instance.

 

Misc

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_NETWORK_EXPLORERS	Array<NetworkExplorer> where NetworkExplorer can have following properties	Used to build up links to transactions, blocks, addresses in other chain explorers.	-	-	[{'title':'Anyblock','baseUrl':'https://explorer.anyblock.tools','paths':{'tx':'/ethereum/poa/core/tx'}}]	v1.0.x+
NEXT_PUBLIC_CONTRACT_CODE_IDES	Array<ContractCodeIde> where ContractCodeIde can have following properties	Used to build up links to IDEs with contract source code.	-	-	[{'title':'Remix IDE','url':'https://remix.blockscout.com/?address={hash}&blockscout={domain}','icon_url':'https://example.com/icon.svg'}]	v1.23.0+
NEXT_PUBLIC_HAS_CONTRACT_AUDIT_REPORTS	boolean	Set to true to enable Submit Audit form on the contract page	-	false	true	v1.25.0+
NEXT_PUBLIC_HIDE_INDEXING_ALERT_BLOCKS	boolean	Set to true to hide indexing alert in the page header about indexing chain's blocks	-	false	true	v1.17.0+
NEXT_PUBLIC_HIDE_INDEXING_ALERT_INT_TXS	boolean	Set to true to hide indexing alert in the page footer about indexing block's internal transactions	-	false	true	v1.17.0+
NEXT_PUBLIC_MAINTENANCE_ALERT_MESSAGE	string	Used for displaying custom announcements or alerts in the header of the site. Could be a regular string or a HTML code.	-	-	Hello world! 🤪	v1.13.0+
NEXT_PUBLIC_COLOR_THEME_DEFAULT	'light' | 'dim' | 'midnight' | 'dark'	Preferred color theme of the app	-	-	midnight	v1.30.0+
NEXT_PUBLIC_FONT_FAMILY_HEADING	FontFamily, see full description below	Special typeface to use in page headings (<h1>, <h2>, etc.)	-	-	{'name':'Montserrat','url':'https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap'}	v1.35.0+
NEXT_PUBLIC_FONT_FAMILY_BODY	FontFamily, see full description below	Main typeface to use in page content elements.	-	-	{'name':'Raleway','url':'https://fonts.googleapis.com/css2?family=Raleway:wght@400;500;600;700&display=swap'}	v1.35.0+
NEXT_PUBLIC_MAX_CONTENT_WIDTH_ENABLED	boolean	Set to true to restrict the page content width on extra-large screens.	-	true	false	v1.34.1+

Network explorer configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
logo	string	URL to explorer logo file. Should be at least 40x40.	-	-	'https://foo.app/icon.png'
title	string	Displayed name of the explorer	Required	-	Anyblock
baseUrl	string	Base url of the explorer	Required	-	https://explorer.anyblock.tools
paths	Record<'tx' | 'block' | 'address' | 'token', string>	Map of explorer entities and their paths	Required	-	{'tx':'/ethereum/poa/core/tx'}

Note The url of an entity will be constructed as <baseUrl><paths[<entity-type>]><entity-id>, e.g https://explorer.anyblock.tools/ethereum/poa/core/tx/<tx-id>

Contract code IDE configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
title	string	Displayed name of the IDE	Required	-	Remix IDE
url	string	URL of the IDE with placeholders for contract hash ({hash}) and current domain ({domain})	Required	-	https://remix.blockscout.com/?address={hash}&blockscout={domain}
icon_url	string	URL of the IDE icon	Required	-	https://example.com/icon.svg

Font family configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
name	string	Font family name; used to define the font-family CSS property.	Required	-	Montserrat
url	string	URL for external font. Ensure the font supports the following weights: 400, 500, 600, and 700.	Required	-	https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap

 

App features

Note The variables which are marked as required should be passed as described in order to enable the particular feature, but they are not required in the whole app context.

My account

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_IS_ACCOUNT_SUPPORTED	boolean	Set to true if network has account feature	Required	-	true	v1.0.x+
NEXT_PUBLIC_AUTH0_CLIENT_ID	string	Client id for Auth0 provider	Required	-	<your-secret>	v1.0.x+
NEXT_PUBLIC_AUTH_URL	string	Account auth base url; it is used for building login URL (${ NEXT_PUBLIC_AUTH_URL }/auth/auth0) and logout return URL (${ NEXT_PUBLIC_AUTH_URL }/auth/logout); if not provided the base app URL will be used instead	Required	-	https://blockscout.com	v1.0.x+
NEXT_PUBLIC_LOGOUT_URL	string	Account logout url. Required if account is supported for the app instance.	Required	-	https://blockscoutcom.us.auth0.com/v2/logout	v1.0.x+

 

Gas tracker

This feature is enabled by default. To switch it off pass NEXT_PUBLIC_GAS_TRACKER_ENABLED=false.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_GAS_TRACKER_ENABLED	boolean	Set to true to enable "Gas tracker" in the app	Required	true	false	v1.25.0+
NEXT_PUBLIC_GAS_TRACKER_UNITS	Array<usd | gwei>	Array of units for displaying gas prices on the Gas Tracker page, in the stats snippet on the Home page, and in the top bar. The first value in the array will take priority over the second one in all mentioned views. If only one value is provided, gas prices will be displayed only in that unit.	-	[ 'usd', 'gwei' ]	[ 'gwei' ]	v1.25.0+

 

Address verification in "My account"

Note all ENV variables required for My account feature should be passed alongside the following ones:

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_CONTRACT_INFO_API_HOST	string	Contract Info API endpoint url	Required	-	https://contracts-info.services.blockscout.com	v1.1.0+
NEXT_PUBLIC_ADMIN_SERVICE_API_HOST	string	Admin Service API endpoint url	Required	-	https://admin-rs.services.blockscout.com	v1.1.0+

 

Blockchain interaction (writing to contract, etc.)

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID	string	Project id for WalletConnect integration	Required	-	<your-secret>	v1.0.x+
NEXT_PUBLIC_NETWORK_RPC_URL	string	See in Blockchain parameters section	Required	-	https://core.poa.network	v1.0.x+
NEXT_PUBLIC_NETWORK_NAME	string	See in Blockchain parameters section	Required	-	Gnosis Chain	v1.0.x+
NEXT_PUBLIC_NETWORK_ID	number	See in Blockchain parameters section	Required	-	99	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_NAME	string	See in Blockchain parameters section	Required	-	Ether	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_SYMBOL	string	See in Blockchain parameters section	Required	-	ETH	v1.0.x+
NEXT_PUBLIC_NETWORK_CURRENCY_DECIMALS	string	See in Blockchain parameters section	-	18	6	v1.0.x+

 

Banner ads

This feature is enabled by default with the slise ads provider. To switch it off pass NEXT_PUBLIC_AD_BANNER_PROVIDER=none. Note that the getit ad provider is temporary disabled.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_AD_BANNER_PROVIDER	slise | adbutler | coinzilla | hype | getit | none	Ads provider	-	slise	coinzilla	v1.0.x+
NEXT_PUBLIC_AD_BANNER_ADDITIONAL_PROVIDER	adbutler	Additional ads provider to mix with the main one	-	-	adbutler	v1.28.0+
NEXT_PUBLIC_AD_ADBUTLER_CONFIG_DESKTOP	{ id: string; width: string; height: string }	Placement config for desktop Adbutler banner	-	-	{'id':'123456','width':'728','height':'90'}	v1.3.0+
NEXT_PUBLIC_AD_ADBUTLER_CONFIG_MOBILE	{ id: string; width: number; height: number }	Placement config for mobile Adbutler banner	-	-	{'id':'654321','width':'300','height':'100'}	v1.3.0+

 

Text ads

This feature is enabled by default with the coinzilla ads provider. To switch it off pass NEXT_PUBLIC_AD_TEXT_PROVIDER=none.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_AD_TEXT_PROVIDER	coinzilla | none	Ads provider	-	coinzilla	none	v1.0.x+

 

Beacon chain

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_HAS_BEACON_CHAIN	boolean	Set to true for networks with the beacon chain	Required	-	true	v1.0.x+
NEXT_PUBLIC_BEACON_CHAIN_CURRENCY_SYMBOL	string	Beacon network currency symbol	-	NEXT_PUBLIC_NETWORK_CURRENCY_SYMBOL	ETH	v1.0.x+

 

User operations (ERC-4337)

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_HAS_USER_OPS	boolean	Set to true to show user operations related data and pages	-	-	true	v1.23.0+

 

Rollup chain

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_ROLLUP_TYPE	'optimistic' | 'arbitrum' | 'shibarium' | 'zkEvm' | 'zkSync'	Rollup chain type	Required	-	'optimistic'	v1.24.0+
NEXT_PUBLIC_ROLLUP_L1_BASE_URL	string	Blockscout base URL for L1 network	Required	-	'http://eth-goerli.blockscout.com'	v1.24.0+
NEXT_PUBLIC_ROLLUP_L2_WITHDRAWAL_URL	string	URL for L2 -> L1 withdrawals (Optimistic stack only)	Required for optimistic rollups	-	https://app.optimism.io/bridge/withdraw	v1.24.0+
NEXT_PUBLIC_FAULT_PROOF_ENABLED	boolean	Set to true for chains with fault proof system enabled (Optimistic stack only)	-	-	true	v1.31.0+
NEXT_PUBLIC_HAS_MUD_FRAMEWORK	boolean	Set to true for instances that use MUD framework (Optimistic stack only)	-	-	true	v1.33.0+

 

Export data to CSV file

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY	string	See below	true	-	<your-secret>	v1.0.x+

 

Google analytics

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_GOOGLE_ANALYTICS_PROPERTY_ID	string	Property ID for Google Analytics service	true	-	UA-XXXXXX-X	v1.0.x+

 

Mixpanel analytics

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_MIXPANEL_PROJECT_TOKEN	string	Project token for Mixpanel analytics service	true	-	<your-secret>	v1.1.0+

 

GrowthBook feature flagging and A/B testing

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_GROWTH_BOOK_CLIENT_KEY	string	Client SDK key for GrowthBook service	true	-	<your-secret>	v1.22.0+

 

GrowthBook feature flagging and A/B testing

Variable	Type	Description	Compulsoriness	Default value	Example value
NEXT_PUBLIC_GROWTH_BOOK_CLIENT_KEY	string	Client SDK key for GrowthBook service	true	-	<your-secret>

 

GraphQL API documentation

This feature is always enabled, but you can disable it by passing none value to NEXT_PUBLIC_GRAPHIQL_TRANSACTION variable.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_GRAPHIQL_TRANSACTION	string	Txn hash for default query at GraphQl playground page. Pass none to disable the feature.	-	-	0x4a0ed8ddf751a7cb5297f827699117b0f6d21a0b2907594d300dc9fed75c7e62	v1.0.x+

 

REST API documentation

This feature is always enabled, but you can disable it by passing none value to NEXT_PUBLIC_API_SPEC_URL variable.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_API_SPEC_URL	string	Spec to be displayed on /api-docs page. Pass none to disable the feature.	-	https://raw.githubusercontent.com/blockscout/blockscout-api-v2-swagger/main/swagger.yaml	https://raw.githubusercontent.com/blockscout/blockscout-api-v2-swagger/main/swagger.yaml	v1.0.x+

 

Marketplace

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_MARKETPLACE_ENABLED	boolean	true means that the marketplace page will be enabled	Required	-	true	v1.24.1+
NEXT_PUBLIC_MARKETPLACE_CONFIG_URL	string	URL of configuration file (.json format only) which contains list of apps that will be shown on the marketplace page. See below list of available properties for an app. Can be replaced with NEXT_PUBLIC_ADMIN_SERVICE_API_HOST	Required	-	https://example.com/marketplace_config.json	v1.0.x+
NEXT_PUBLIC_ADMIN_SERVICE_API_HOST	string	Admin Service API endpoint url. Can be used instead of NEXT_PUBLIC_MARKETPLACE_CONFIG_URL	-	-	https://admin-rs.services.blockscout.com	v1.1.0+
NEXT_PUBLIC_MARKETPLACE_SUBMIT_FORM	string	Link to form where authors can submit their dapps to the marketplace	Required	-	https://airtable.com/shrqUAcjgGJ4jU88C	v1.0.x+
NEXT_PUBLIC_MARKETPLACE_SUGGEST_IDEAS_FORM	string	Link to form where users can suggest ideas for the marketplace	-	-	https://airtable.com/appiy5yijZpMMSKjT/pag3t82DUCyhGRZZO/form	v1.24.0+
NEXT_PUBLIC_NETWORK_RPC_URL	string	See in Blockchain parameters section	Required	-	https://core.poa.network	v1.0.x+
NEXT_PUBLIC_MARKETPLACE_CATEGORIES_URL	string	URL of configuration file (.json format only) which contains the list of categories to be displayed on the marketplace page in the specified order. If no URL is provided, then the list of categories will be compiled based on the categories fields from the marketplace (apps) configuration file	-	-	https://example.com/marketplace_categories.json	v1.23.0+
NEXT_PUBLIC_MARKETPLACE_SECURITY_REPORTS_URL	string	URL of configuration file (.json format only) which contains app security reports for displaying security scores on the Marketplace page	-	-	https://example.com/marketplace_security_reports.json	v1.28.0+
NEXT_PUBLIC_MARKETPLACE_FEATURED_APP	string	ID of the featured application to be displayed on the banner on the Marketplace page	-	-	uniswap	v1.29.0+
NEXT_PUBLIC_MARKETPLACE_BANNER_CONTENT_URL	string	URL of the banner HTML content	-	-	https://example.com/banner	v1.29.0+
NEXT_PUBLIC_MARKETPLACE_BANNER_LINK_URL	string	URL of the page the banner leads to	-	-	https://example.com	v1.29.0+
NEXT_PUBLIC_MARKETPLACE_RATING_AIRTABLE_API_KEY	string	Airtable API key	-	-	-	v1.33.0+
NEXT_PUBLIC_MARKETPLACE_RATING_AIRTABLE_BASE_ID	string	Airtable base ID with dapp ratings	-	-	-	v1.33.0+

Marketplace app configuration properties

Property	Type	Description	Compulsoriness	Example value
id	string	Used as slug for the app. Must be unique in the app list.	Required	'app'
external	boolean	true means that the application opens in a new window, but not in an iframe.	-	true
title	string	Displayed title of the app.	Required	'The App'
logo	string	URL to logo file. Should be at least 288x288.	Required	'https://foo.app/icon.png'
shortDescription	string	Displayed only in the app list.	Required	'Awesome app'
categories	Array<string>	Displayed category.	Required	['Security', 'Tools']
author	string	Displayed author of the app	Required	'Bob'
url	string	URL of the app which will be launched in the iframe.	Required	'https://foo.app/launch'
description	string	Displayed only in the modal dialog with additional info about the app.	Required	'The best app'
site	string	Displayed site link	-	'https://blockscout.com'
twitter	string	Displayed twitter link	-	'https://twitter.com/blockscoutcom'
telegram	string	Displayed telegram link	-	'https://t.me/poa_network'
github	string	Displayed github link	-	'https://github.com/blockscout'
internalWallet	boolean	true means that the application can automatically connect to the Blockscout wallet.	-	true
priority	number	The higher the priority, the higher the app will appear in the list on the Marketplace page.	-	7

 

Solidity to UML diagrams

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VISUALIZE_API_HOST	string	Visualize API endpoint url	Required	-	https://visualizer.services.blockscout.com	v1.0.x+
NEXT_PUBLIC_VISUALIZE_API_BASE_PATH	string	Base path for Visualize API endpoint url	-	-	/poa/core	v1.29.0+

 

Blockchain statistics

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_STATS_API_HOST	string	Stats API endpoint url	Required	-	https://stats.services.blockscout.com	v1.0.x+
NEXT_PUBLIC_STATS_API_BASE_PATH	string	Base path for Stats API endpoint url	-	-	/poa/core	v1.29.0+

 

Web3 wallet integration (add token or network to the wallet)

This feature is enabled by default with the ['metamask'] value. To switch it off pass NEXT_PUBLIC_WEB3_WALLETS=none.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_WEB3_WALLETS	Array<'metamask' | 'coinbase' | 'token_pocket'>	Array of Web3 wallets which will be used to add tokens or chain to. The first wallet which is enabled in user's browser will be shown.	-	[ 'metamask' ]	[ 'coinbase' ]	v1.10.0+
NEXT_PUBLIC_WEB3_DISABLE_ADD_TOKEN_TO_WALLET	boolean	Set to true to hide icon "Add to your wallet" next to token addresses	-	-	true	v1.0.x+

 

Transaction interpretation

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_TRANSACTION_INTERPRETATION_PROVIDER	blockscout | noves | none	Transaction interpretation provider that displays human readable transaction description	-	none	blockscout	v1.21.0+

 

Verified tokens info

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_CONTRACT_INFO_API_HOST	string	Contract Info API endpoint url	Required	-	https://contracts-info.services.blockscout.com	v1.0.x+

 

Name service integration

This feature allows resolving blockchain addresses using human-readable domain names.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_NAME_SERVICE_API_HOST	string	Name Service API endpoint url	Required	-	https://bens.services.blockscout.com	v1.22.0+

 

Metadata service integration

This feature allows name tags and other public tags for addresses.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_METADATA_SERVICE_API_HOST	string	Metadata Service API endpoint url	Required	-	https://metadata.services.blockscout.com	v1.30.0+

 

Public tag submission

This feature allows you to submit an application with a public address tag.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_METADATA_SERVICE_API_HOST	string	Metadata Service API endpoint url	Required	-	https://metadata.services.blockscout.com	v1.30.0+
NEXT_PUBLIC_ADMIN_SERVICE_API_HOST	string	Admin Service API endpoint url	Required	-	https://admin-rs.services.blockscout.com	v1.1.0+

 

Data Availability

This feature enables views related to blob transactions (EIP-4844), such as the Blob Txns tab on the Transactions page and the Blob details page.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_DATA_AVAILABILITY_ENABLED	boolean	Set to true to enable blob transactions views.	Required	-	true	v1.28.0+

 

Bridged tokens

This feature allows users to view tokens that have been bridged from other EVM chains. Additional tab "Bridged" will be added to the tokens page and the link to original token will be displayed on the token page.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_BRIDGED_TOKENS_CHAINS	Array<BridgedTokenChain> where BridgedTokenChain can have following properties	Used for displaying filter by the chain from which token where bridged. Also, used for creating links to original tokens in other explorers.	Required	-	[{'id':'1','title':'Ethereum','short_title':'ETH','base_url':'https://eth.blockscout.com/token'}]	v1.14.0+
NEXT_PUBLIC_BRIDGED_TOKENS_BRIDGES	Array<TokenBridge> where TokenBridge can have following properties	Used for displaying text about bridges types on the tokens page.	Required	-	[{'type':'omni','title':'OmniBridge','short_title':'OMNI'}]	v1.14.0+

Bridged token chain configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
id	string	Base chain id, see https://chainlist.org for the reference	Required	-	1
title	string	Displayed name of the chain	Required	-	Ethereum
short_title	string	Used for displaying chain name in the list view as tag	Required	-	ETH
base_url	string	Base url to original token in base chain explorer	Required	-	https://eth.blockscout.com/token

Note The url to original token will be constructed as <base_url>/<token_hash>, e.g https://eth.blockscout.com/token/<token_hash>

Token bridge configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
type	string	Bridge type; should be matched to bridge_type field in API response	Required	-	omni
title	string	Bridge title	Required	-	OmniBridge
short_title	string	Bridge short title for displaying in the tags	Required	-	OMNI

 

Safe{Core} address tags

For the smart contract addresses which are Safe{Core} accounts public tag "Multisig: Safe" will be displayed in the address page header alongside to Safe logo.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_SAFE_TX_SERVICE_URL	string	The Safe transaction service URL. See full list of supported networks here.	-	-	uniswap	v1.26.0+

 

SUAVE chain

For blockchains that implement SUAVE architecture additional fields will be shown on the transaction page ("Allowed peekers", "Kettle"). Users also will be able to see the list of all transactions for a particular Kettle in the separate view.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_IS_SUAVE_CHAIN	boolean	Set to true for blockchains with SUAVE architecture	Required	-	true	v1.14.0+

 

MetaSuites extension

Enables MetaSuites browser extension to integrate with the app views.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_METASUITES_ENABLED	boolean	Set to true to enable integration	Required	-	true	v1.26.0+

 

Validators list

The feature enables the Validators page which provides detailed information about the validators of the PoS chains.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_VALIDATORS_CHAIN_TYPE	'stability' | 'blackfort'	Chain type	Required	-	'stability'	v1.25.0+

 

MetaSuites extension

Enables MetaSuites browser extension to integrate with the app views.

Variable	Type	Description	Compulsoriness	Default value	Example value
NEXT_PUBLIC_METASUITES_ENABLED	boolean	Set to true to enable integration	Required	-	true

 

Validators list

The feature enables the Validators page which provides detailed information about the validators of the PoS chains.

Variable	Type	Description	Compulsoriness	Default value	Example value
NEXT_PUBLIC_VALIDATORS_CHAIN_TYPE	'stability'	Chain type	Required	-	'stability'

 

Sentry error monitoring

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_SENTRY_DSN	string	Client key for your Sentry.io app	Required	-	<your-secret>	v1.0.x+
SENTRY_CSP_REPORT_URI	string	URL for sending CSP-reports to your Sentry.io app	-	-	<your-secret>	v1.0.x+
NEXT_PUBLIC_SENTRY_ENABLE_TRACING	boolean	Enables tracing and performance monitoring in Sentry.io	-	false	true	v1.17.0+
NEXT_PUBLIC_APP_ENV	string	App env (e.g development, review or production). Passed as environment property to Sentry config	-	production	production	v1.0.x+
NEXT_PUBLIC_APP_INSTANCE	string	Name of app instance. Used as custom tag app_instance value in the main Sentry scope. If not provided, it will be constructed from NEXT_PUBLIC_APP_HOST	-	-	wonderful_kepler	v1.0.x+

 

OpenTelemetry

OpenTelemetry SDK for Node.js app could be enabled by passing OTEL_SDK_ENABLED=true variable. Configure the OpenTelemetry Protocol Exporter by using the generic environment variables described in the OT docs. Note that this Next.js feature is currently experimental. The Docker image should be built with the NEXT_OPEN_TELEMETRY_ENABLED=true argument to enable it.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
OTEL_SDK_ENABLED	boolean	Run-time flag to enable the feature	Required	false	true	v1.18.0+

 

DeFi dropdown

If the feature is enabled, a single button or a dropdown (if more than 1 item is provided) will be displayed at the top of the explorer page, which will take a user to the specified application in the marketplace or to an external site.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_DEFI_DROPDOWN_ITEMS	[{ text: string; icon: string; dappId?: string, url?: string }]	An array of dropdown items containing the button text, icon name and dappId in DAppscout or an external url	-	-	[{'text':'Swap','icon':'swap','dappId':'uniswap'},{'text':'Payment link','icon':'payment_link','dappId':'peanut-protocol'}]	v1.31.0+

 

Multichain balance button

If the feature is enabled, a Multichain balance button will be displayed on the address page, which will take you to the portfolio application in the marketplace or to an external site.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_MULTICHAIN_BALANCE_PROVIDER_CONFIG	{ name: string; url_template: string; dapp_id?: string; logo?: string }	Multichain portfolio application config See below	-	-	{ name: 'zerion', url_template: 'https://app.zerion.io/{address}/overview', logo: 'https://example.com/icon.svg'	v1.31.0+

 

Multichain button configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
name	string	Multichain portfolio application name	Required	-	zerion
url_template	string	Url template to the portfolio. Should be a template with {address} variable	Required	-	https://app.zerion.io/{address}/overview
dapp_id	string	Set for open a Blockscout dapp page with the portfolio instead of opening external app page	-	-	zerion
logo	string	Multichain portfolio application logo (.svg) url	-	-	https://example.com/icon.svg

 

Get gas button

If the feature is enabled, a Get gas button will be displayed in the top bar, which will take you to the gas refuel application in the marketplace or to an external site.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_GAS_REFUEL_PROVIDER_CONFIG	{ name: string; url_template: string; dapp_id?: string; logo?: string }	Get gas button config. See below	-	-	{ name: 'Need gas?', dapp_id: 'smol-refuel', url_template: 'https://smolrefuel.com/?outboundChain={chainId}', logo: 'https://example.com/icon.png' }	v1.33.0+

 

Get gas button configuration properties

Variable	Type	Description	Compulsoriness	Default value	Example value
name	string	Text on the button	Required	-	Need gas?
url_template	string	Url template, may contain {chainId} variable	Required	-	https://smolrefuel.com/?outboundChain={chainId}
dapp_id	string	Set for open a Blockscout dapp page instead of opening external app page	-	-	smol-refuel
logo	string	Gas refuel application logo url	-	-	https://example.com/icon.png

 

Save on gas with GasHawk

The feature enables a "Save with GasHawk" button next to the "Gas used" value on the address page.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_SAVE_ON_GAS_ENABLED	boolean	Set to "true" to enable the feature	-	-	true	v1.35.0+

 

Swap button

If the feature is enabled, a Swap button will be displayed at the top of the explorer page, which will take you to the specified application in the marketplace or to an external site.

Variable	Type	Description	Compulsoriness	Default value	Example value
NEXT_PUBLIC_SWAP_BUTTON_URL	string	Application ID in the marketplace or website URL	-	-	uniswap

 

External services configuration

Google ReCaptcha

For obtaining the variables values please refer to reCAPTCHA documentation.

Variable	Type	Description	Compulsoriness	Default value	Example value	Version
NEXT_PUBLIC_RE_CAPTCHA_APP_SITE_KEY	string	Site key	-	-	<your-secret>	v1.0.x+