diff --git a/apps/cowswap-frontend/.env b/apps/cowswap-frontend/.env
index 1773c7002d..6e3cb38974 100644
--- a/apps/cowswap-frontend/.env
+++ b/apps/cowswap-frontend/.env
@@ -103,6 +103,17 @@ INTEGRATION_TESTS_INFURA_KEY=
 #REACT_APP_EXPLORER_URL_PROD=
 #REACT_APP_EXPLORER_URL_BARN=
 
+#######################################
+# Block Explorer Override
+#######################################
+# Override the default block explorer URL (e.g., Etherscan, Gnosisscan).
+# Useful for local development with tools like Otterscan.
+# When set, all block explorer links will use this URL instead of the chain's default.
+# The URL should not include a trailing slash.
+#
+# Example for local Otterscan:
+#REACT_APP_BLOCK_EXPLORER_URL=http://localhost:8003
+
 
 
 
diff --git a/apps/explorer/.env.example b/apps/explorer/.env.example
index 8bd1ce4ad6..c7d3883adc 100644
--- a/apps/explorer/.env.example
+++ b/apps/explorer/.env.example
@@ -22,3 +22,12 @@ THEGRAPH_API_KEY=
 # REACT_APP_DOMAIN_REGEX_DEVELOPMENT="^(dev\.explorer\.cow\.fi|explorer-develop\.vercel\.app)"
 # REACT_APP_DOMAIN_REGEX_STAGING="^(staging\.explorer\.cow\.fi|explorer-staging\.vercel\.app)"
 # REACT_APP_DOMAIN_REGEX_PRODUCTION="^(explorer\.cow\.fi|explorer-prod\.vercel\.app)$"
+
+# Block Explorer Override
+# Override the default block explorer URL (e.g., Etherscan, Gnosisscan).
+# Useful for local development with tools like Otterscan.
+# When set, all block explorer links will use this URL instead of the chain's default.
+# The URL should not include a trailing slash.
+#
+# Example for local Otterscan:
+#REACT_APP_BLOCK_EXPLORER_URL=http://localhost:8003
diff --git a/libs/common-utils/src/getExplorerLink.ts b/libs/common-utils/src/getExplorerLink.ts
index f86bc29b54..4b8ab268cd 100644
--- a/libs/common-utils/src/getExplorerLink.ts
+++ b/libs/common-utils/src/getExplorerLink.ts
@@ -8,6 +8,18 @@ export enum ExplorerDataType {
   BLOCK = 'block',
 }
 
+/**
+ * Environment variable to override the block explorer URL.
+ * Useful for local development with tools like Otterscan.
+ *
+ * When set, this URL will be used instead of the chain's default block explorer (e.g., Etherscan).
+ * The URL should not include a trailing slash.
+ *
+ * @example
+ * REACT_APP_BLOCK_EXPLORER_URL=http://localhost:8003
+ */
+const BLOCK_EXPLORER_URL_OVERRIDE = process.env.REACT_APP_BLOCK_EXPLORER_URL
+
 /**
  * Return the explorer link for the given data and data type
  * @param chainId the ID of the chain for which to return the data
@@ -21,7 +33,8 @@ export function getExplorerLink(
   type: ExplorerDataType,
   defaultPrefix = 'https://etherscan.io',
 ): string {
-  const prefix = CHAIN_INFO[chainId as SupportedChainId]?.explorer ?? defaultPrefix
+  // Allow override via environment variable for local development (e.g., Otterscan)
+  const prefix = BLOCK_EXPLORER_URL_OVERRIDE || CHAIN_INFO[chainId as SupportedChainId]?.explorer || defaultPrefix
 
   switch (type) {
     case ExplorerDataType.TRANSACTION:
diff --git a/libs/common-utils/src/legacyAddressUtils.ts b/libs/common-utils/src/legacyAddressUtils.ts
index 2441bd0808..c2691f07b8 100644
--- a/libs/common-utils/src/legacyAddressUtils.ts
+++ b/libs/common-utils/src/legacyAddressUtils.ts
@@ -9,6 +9,12 @@ import { t } from '@lingui/core/macro'
 
 import { getExplorerOrderLink } from './explorer'
 
+/**
+ * Environment variable to override the block explorer URL.
+ * Useful for local development with tools like Otterscan.
+ */
+const BLOCK_EXPLORER_URL_OVERRIDE = process.env.REACT_APP_BLOCK_EXPLORER_URL
+
 // returns the checksummed address if the address is valid, otherwise returns false
 export function isAddress(value: string | undefined | null): string | false {
   try {
@@ -69,7 +75,8 @@ export type BlockExplorerLinkType =
 
 // eslint-disable-next-line complexity
 function getEtherscanUrl(chainId: SupportedChainId, data: string, type: BlockExplorerLinkType, base?: string): string {
-  const basePath = base || CHAIN_INFO[chainId]?.explorer
+  // Allow override via environment variable for local development (e.g., Otterscan)
+  const basePath = BLOCK_EXPLORER_URL_OVERRIDE || base || CHAIN_INFO[chainId]?.explorer
 
   if (!basePath) return ''