feat: support Etherscan API keys

[matthewwalsh0]

Description

Upgrade the TransactionController to:

• Support Etherscan API keys when polling for incoming transactions.
• Populate submitHistory to aid with debug and persist even when resetting the account.

Also adds the ETHERSCAN_API_KEY environment variable.

Related issues

Manual testing steps

1. Verify incoming transactions work on Mainnet and Sepolia with an API key set.
2. Verify submitHistory is populated in state logs after creating transactions and retrying, on both Infura and custom networks.

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.

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@metamask/transaction-controller@37.2.0	network	0	2.13 MB	metamaskbot

🚮 Removed packages: npm/@metamask/transaction-controller@37.1.0

View full report↗︎

[metamaskbot]

Builds ready [2a32e08]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (2087 ± 141 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	306	2624	1786	631	303
		domContentLoaded	1716	2927	2050	297	143
		load	1772	2938	2087	294	141
		domInteractive	27	110	57	22	11

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

• background: 80 Bytes (0.00%)
• ui: -70 Bytes (-0.00%)
• common: 1.41 KiB (0.02%)

[metamaskbot]

Builds ready [202a77b]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1785 ± 124 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1528	2480	1782	249	119
		domContentLoaded	1521	2462	1762	245	118
		load	1527	2543	1785	258	124
		domInteractive	26	82	48	19	9

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

• background: 80 Bytes (0.00%)
• ui: -70 Bytes (-0.00%)
• common: 1.41 KiB (0.02%)

[sleepytanya]

Incoming transactions on Ethereum Mainnet:

ethereumtHistory.mov

Incoming transactions on Sepolia:

Sepolia.mov

Sepolia state logs:

Mainnet on Infura and blastapi:

BNB on bsc-dataseed and llamarpc:

Polygon on Infura and llamarpc:

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[metamaskbot]

Builds ready [73c56ad]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1754 ± 75 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	175	2188	1675	381	183
		domContentLoaded	1540	2090	1728	137	66
		load	1544	2200	1754	156	75
		domInteractive	23	71	38	14	7

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

• background: 80 Bytes (0.00%)
• ui: -70 Bytes (-0.00%)
• common: 242 Bytes (0.00%)