wip: Add multichain API support for Snaps

[FrederikBolding]

Description

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

1. Go to this page...

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.

[metamaskbotv2]

✨ Files requiring CODEOWNER review ✨

🫰 @MetaMask/core-platform (1 files, +15 -0)

• 📁 app/
  • 📁 scripts/
    • 📁 controller-init/
      • 📁 snaps/
        • 📄 execution-service-init.ts +15 -0

[metamaskbotv2]

Builds ready [e2708fa]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
  • content-script: 0
  • offscreen: 0

📊 Page Load Benchmark Results

Current Commit: e2708fa | Date: 1/7/2026

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.07s (±70ms) 🟡 | historical mean value: 1.04s ⬆️ (historical data)
• domContentLoaded-> current mean value: 749ms (±67ms) 🟢 | historical mean value: 725ms ⬆️ (historical data)
• firstContentfulPaint-> current mean value: 78ms (±10ms) 🟢 | historical mean value: 77ms ⬆️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.07s	70ms	1.02s	1.34s	1.30s	1.34s
domContentLoaded	749ms	67ms	707ms	1.02s	975ms	1.02s
firstPaint	78ms	10ms	60ms	156ms	88ms	156ms
firstContentfulPaint	78ms	10ms	60ms	156ms	88ms	156ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

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

• background: 113.87 KiB (2.36%)
• ui: 341 Bytes (0%)
• common: 1.18 KiB (0.01%)