fix: handle unsupported network from API

[n3ps]

Description

API treats unsupported networks as a 400 error

This PR normalizes that response as an empty result instead

Changelog

CHANGELOG entry: fix: handle unsupported network from API

Related issues

Fixes: #42402

Manual testing steps

0. On an empty account
1. Go to Activity tab
2. Switch to a known API-unsupported network ie. Avalanche

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

---

Note

Medium Risk
Changes runtime query behavior for transactions fetching/prefetching by intercepting specific HttpError 400 responses and returning an empty dataset, which could mask real API issues if the message match is too broad.

Overview
Prevents the Activity transactions query from failing when the Accounts API returns a known unsupported networks 400 error by wrapping the React Query queryFn to return an empty transactions response instead of throwing.

Adds a shared getErrorBodyMessage helper to safely read body.message for error matching, and expands tests to cover the new normalization behavior for both useTransactionsQuery and usePrefetchTransactions (while ensuring unexpected errors still reject).

^{Reviewed by Cursor Bugbot for commit 336478e. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

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[metamaskbotv2]

✨ Files requiring CODEOWNER review ✨

👨‍🔧 @MetaMask/core-extension-ux (2 files, +155 -3)

• 📁 ui/
  • 📁 components/
    • 📁 multichain/
      • 📁 activity-v2/
        • 📄 useTransactionsQuery.test.ts +103 -1
        • 📄 useTransactionsQuery.ts +52 -2

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
94.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[metamaskbotv2]

Builds ready [336478e]

• ⚠️ Make sure the build is safe before downloading and running this build.
  • Please do not use these builds with accounts that contain significant real money.
  • Beware the security risks of cache poisoning.
• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• webpack builds: chrome, firefox
• webpack builds (beta): chrome, firefox
• webpack builds (flask): chrome, firefox
• webpack builds (test): chrome, firefox
• webpack builds (test-flask): chrome, firefox
• bundle size: Bundle Size Stats
• bundle analyzer: Bundle Analyzer
• interaction-benchmark: Interaction Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts

⚡ Performance Benchmarks (Total: 🟢 15 pass · 🟡 9 warn · 🔴 0 fail)

Baseline (latest main): 51036da | Date: 5/2/2026 | Pipeline: 25810125888 | Baseline logs

Interaction Benchmarks · Samples: 5

Benchmark	chrome-webpack	firefox-webpack
loadNewAccount [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
confirmTx [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
bridgeUserActions [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]

📈 Results compared to the previous 5 runs on main

• ↓ loadNewAccount/load_new_account: -74%
• ↓ loadNewAccount/total: -74%
• ↓ bridgeUserActions/bridge_load_page: -29%
• ↓ bridgeUserActions/bridge_load_asset_picker: -23%
• ↓ bridgeUserActions/bridge_search_token: -29%
• ↓ bridgeUserActions/total: -29%
• ↓ loadNewAccount/load_new_account: -73%
• ↓ loadNewAccount/total: -73%
• ↓ bridgeUserActions/bridge_load_page: -19%
• ↓ bridgeUserActions/bridge_load_asset_picker: -57%
• ↓ bridgeUserActions/bridge_search_token: -37%
• ↓ bridgeUserActions/total: -36%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🟡 loadNewAccount/FCP: p75 2.0s
• 🟡 confirmTx/FCP: p75 2.0s
• 🟡 bridgeUserActions/FCP: p75 2.0s

Startup Benchmarks · Samples: 100

Benchmark	chrome-webpack	firefox-webpack
startupStandardHome [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
startupPowerUserHome [Sentry log · main/release]	–	🟡 [CI log]

📈 Results compared to the previous 5 runs on main

• ↓ startupStandardHome/uiStartup: -17%
• ↓ startupStandardHome/load: -12%
• ↓ startupStandardHome/domContentLoaded: -12%
• ↑ startupStandardHome/domInteractive: +14%
• ↑ startupStandardHome/firstPaint: +12%
• ↓ startupStandardHome/backgroundConnect: -37%
• ↓ startupStandardHome/firstReactRender: -22%
• ↓ startupStandardHome/loadScripts: -12%
• ↓ startupStandardHome/numNetworkReqs: -50%
• ↓ startupStandardHome/uiStartup: -17%
• ↓ startupStandardHome/domInteractive: -55%
• ↓ startupStandardHome/backgroundConnect: -14%
• ↓ startupStandardHome/initialActions: -40%
• ↓ startupStandardHome/setupStore: -58%
• ↓ startupStandardHome/numNetworkReqs: -45%
• ↓ startupPowerUserHome/uiStartup: -43%
• ↓ startupPowerUserHome/load: -19%
• ↓ startupPowerUserHome/domContentLoaded: -19%
• ↓ startupPowerUserHome/domInteractive: -73%
• ↓ startupPowerUserHome/backgroundConnect: -47%
• ↓ startupPowerUserHome/firstReactRender: -14%
• ↓ startupPowerUserHome/loadScripts: -17%
• ↓ startupPowerUserHome/setupStore: -89%
• ↓ startupPowerUserHome/numNetworkReqs: -69%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🟡 startupPowerUserHome/LCP: p75 2.8s

User Journey Benchmarks · Samples: 5 · mock API

Benchmark	chrome-webpack	firefox-webpack
onboardingImportWallet [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
onboardingNewWallet [Sentry log · main/release]	🟢 [CI log]	🟢 [CI log]
assetDetails [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
solanaAssetDetails [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
importSrpHome [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
sendTransactions [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]
swap [Sentry log · main/release]	🟡 [CI log]	🟢 [CI log]

📈 Results compared to the previous 5 runs on main

• ↓ onboardingImportWallet/srpButtonToSrpForm: -83%
• ↑ onboardingImportWallet/pwFormToMetricsScreen: +629%
• ↓ onboardingImportWallet/doneButtonToHomeScreen: -78%
• ↑ onboardingImportWallet/openAccountMenuToAccountListLoaded: +23%
• ↓ onboardingImportWallet/total: -43%
• ↓ onboardingNewWallet/srpButtonToPwForm: -75%
• ↑ onboardingNewWallet/createPwToRecoveryScreen: +1207%
• ↓ onboardingNewWallet/skipBackupToMetricsScreen: -62%
• ↑ onboardingNewWallet/agreeButtonToOnboardingSuccess: +16%
• ↓ onboardingNewWallet/doneButtonToAssetList: -29%
• ↓ onboardingNewWallet/total: -24%
• ↓ assetDetails/assetClickToPriceChart: -47%
• ↓ assetDetails/total: -47%
• ↓ solanaAssetDetails/assetClickToPriceChart: -74%
• ↓ solanaAssetDetails/total: -74%
• ↓ importSrpHome/loginToHomeScreen: -16%
• ↓ importSrpHome/openAccountMenuAfterLogin: -78%
• ↓ importSrpHome/homeAfterImportWithNewWallet: -69%
• ↓ importSrpHome/total: -62%
• ↓ swap/openSwapPageFromHome: -97%
• ↑ swap/fetchAndDisplaySwapQuotes: +36%
• ↑ swap/total: +12%

🌐 Core Web Vitals — 🟢 good · 🟡 needs improvement · 🔴 poor (web.dev thresholds)

• 🟡 assetDetails/INP: p75 208ms
• 🟡 assetDetails/FCP: p75 1.9s
• 🟡 solanaAssetDetails/FCP: p75 1.9s
• 🟡 importSrpHome/FCP: p75 1.9s
• 🟡 sendTransactions/INP: p75 272ms
• 🟡 sendTransactions/FCP: p75 1.9s
• 🟡 swap/FCP: p75 2.0s

Dapp Page Load Benchmarks · Samples: 100

Benchmark	chrome-webpack
dappPageLoad [Sentry log · main/release]	🟢 [CI log]

📈 Results compared to the previous 5 runs on main

• ↑ dappPageLoad/pageLoadTime: +25%

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 6.06 MiB (100%)
• ui: 9.42 MiB (100%)
• common: 11.95 MiB (100%)