diff --git a/CHANGELOG.md b/CHANGELOG.md
index 466fbb0f8..9e8301534 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- fixed: (EVM) Honor the `evmScanApiKey` init option on `api.etherscan.io`. Since the Etherscan V2 upgrade, key lookup for that host required the deprecated `etherscanApiKey` and threw before considering `evmScanApiKey`, so a build configured with only the supported option sent no key. Etherscan V2 rejects keyless requests, leaving the EvmScan adapter (the sole transaction-history source on 15 EVM networks) unable to return transactions, which pinned wallet sync at 50% forever. An empty string or empty array now counts as unconfigured so it falls through to the deprecated per-network keys.
+
 ## 4.86.2 (2026-07-17)
 
 - changed: (Base) Use dynamic `eth_feeHistory` fee estimation instead of a hardcoded 2 gwei priority floor. The previous static floor caused sends to overpay by ~200x during normal network conditions. The dynamic algorithm tracks real-time percentile-based priority fees with a 2x base-fee buffer, so fees rise naturally during congestion spikes and drop to market rate otherwise. The static `minPriorityFee` fallback (used only when `eth_feeHistory` fails) is lowered from 2 gwei to 0.1 gwei, a conservative 20x reduction that covered the observed p99 priority fee in a 1,024-block Base sample.
diff --git a/src/ethereum/fees/feeProviders.ts b/src/ethereum/fees/feeProviders.ts
index df1fbdceb..97f065c65 100644
--- a/src/ethereum/fees/feeProviders.ts
+++ b/src/ethereum/fees/feeProviders.ts
@@ -339,6 +339,17 @@ export const fetchFeesFromInfoServer = async (
   return asEthereumFees(json)
 }
 
+/**
+ * An init option counts as missing when it is absent, an empty string, or an
+ * empty array. The GUI defaults `evmScanApiKey` to `[]`, so a plain null check
+ * would treat an unconfigured build as configured and send a keyless request.
+ */
+const hasApiKey = (apiKey: unknown): boolean => {
+  if (apiKey == null) return false
+  if (Array.isArray(apiKey)) return apiKey.length > 0
+  return apiKey !== ''
+}
+
 // Get API key for Etherscan v2 API or network-specific scan APIs
 export const getEvmScanApiKey = (
   initOptions: JsonObject,
@@ -351,15 +362,23 @@ export const getEvmScanApiKey = (
 
   const { currencyCode } = info
 
-  // If we have a server URL and it's etherscan.io, use the Ethereum API key
+  // `evmScanApiKey` is the supported option and is valid for every Etherscan v2
+  // network, etherscan.io included. It must be checked first, otherwise a build
+  // configured with only this option gets no key at all, Etherscan v2 rejects
+  // the keyless request, and transaction history never syncs.
+  if (hasApiKey(evmScanApiKey)) return evmScanApiKey
+
+  // Etherscan v2 rejects keyless requests with 'Missing/Invalid API Key', so a
+  // build with no usable key cannot query this server at all:
   if (serverUrl.includes('etherscan.io')) {
-    if (etherscanApiKey == null)
-      throw new Error(`Missing etherscanApiKey for etherscan.io`)
+    if (!hasApiKey(etherscanApiKey))
+      throw new Error(`Missing evmScanApiKey for etherscan.io`)
+    log.warn(
+      "INIT OPTION 'etherscanApiKey' IS DEPRECATED. USE 'evmScanApiKey' INSTEAD"
+    )
     return etherscanApiKey
   }
 
-  if (evmScanApiKey != null) return evmScanApiKey
-
   // For networks that don't support Etherscan v2, fall back to network-specific keys
   if (currencyCode === 'ETH' && etherscanApiKey != null) {
     log.warn(
diff --git a/test/ethereum/fees/getEvmScanApiKey.test.ts b/test/ethereum/fees/getEvmScanApiKey.test.ts
new file mode 100644
index 000000000..2b307d965
--- /dev/null
+++ b/test/ethereum/fees/getEvmScanApiKey.test.ts
@@ -0,0 +1,69 @@
+import { expect } from 'chai'
+import { EdgeLog } from 'edge-core-js/types'
+import { describe, it } from 'mocha'
+
+import { getEvmScanApiKey } from '../../../src/ethereum/fees/feeProviders'
+import { currencyInfo as info } from '../../../src/ethereum/info/ethereumInfo'
+
+describe('getEvmScanApiKey', function () {
+  const etherscanServer = 'https://api.etherscan.io'
+  const otherScanServer = 'https://api.routescan.io'
+
+  const warnings: string[] = []
+  const log = Object.assign(() => {}, {
+    warn: (...args: any[]) => {
+      warnings.push(String(args[0]))
+    },
+    error: () => {},
+    crash: () => {}
+  }) as unknown as EdgeLog
+
+  it('uses evmScanApiKey for etherscan.io', function () {
+    // A build configured with only the supported option must work. Preferring
+    // the deprecated etherscanApiKey here left transaction history unsynced.
+    const out = getEvmScanApiKey(
+      { evmScanApiKey: ['key1'] },
+      info,
+      log,
+      etherscanServer
+    )
+    expect(out).deep.equals(['key1'])
+  })
+
+  it('uses evmScanApiKey for non-etherscan.io servers', function () {
+    const out = getEvmScanApiKey(
+      { evmScanApiKey: ['key1'] },
+      info,
+      log,
+      otherScanServer
+    )
+    expect(out).deep.equals(['key1'])
+  })
+
+  it('falls back to the deprecated etherscanApiKey when evmScanApiKey is an empty array', function () {
+    // The GUI defaults evmScanApiKey to [], so an empty array means unconfigured:
+    const out = getEvmScanApiKey(
+      { evmScanApiKey: [], etherscanApiKey: ['legacy'] },
+      info,
+      log,
+      etherscanServer
+    )
+    expect(out).deep.equals(['legacy'])
+  })
+
+  it('falls back to the deprecated etherscanApiKey when evmScanApiKey is absent', function () {
+    const out = getEvmScanApiKey(
+      { etherscanApiKey: ['legacy'] },
+      info,
+      log,
+      etherscanServer
+    )
+    expect(out).deep.equals(['legacy'])
+  })
+
+  it('throws for etherscan.io when no usable key is configured', function () {
+    expect(() =>
+      getEvmScanApiKey({ evmScanApiKey: [] }, info, log, etherscanServer)
+    ).to.throw('Missing evmScanApiKey for etherscan.io')
+  })
+})