feat!: Add Multichain API support #3759
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packages/snaps-simulation/src/middleware/internal-methods/chain-id.ts
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packages/snaps-simulation/src/middleware/multichain/create-session.ts
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packages/snaps-simulation/src/middleware/multichain/invoke-method.ts
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packages/examples/packages/multichain-provider/src/modules/base.ts
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3759 +/- ##
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Coverage 98.33% 98.34%
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Files 422 430 +8
Lines 12082 12250 +168
Branches 1876 1904 +28
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Mrtenz
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packages/examples/packages/multichain-provider/src/modules/base.ts
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| export const DEFAULT_ACCOUNTS: SimulationAccount[] = [ | ||
| { | ||
| address: '0x1234567890abcdef1234567890abcdef12345678', | ||
| address: '0xc6d5a3c98ec9073b54fa0969957bd582e8d874bf', |
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I guess this may be breaking, but it makes a lot more sense for this to return the address of the default account in the simulation IMO
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Yeah, this should be considered breaking.
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packages/examples/packages/multichain-provider/src/modules/evm.ts
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Adds support for using the multichain API in Snaps. This is accomplished by setting up a separate provider and substream called
metamask-multichain-provider. Whensnap.requestis called with a multichain request, this provider and substream is used. The clients will need to route to the proper JSON-RPC pipeline based on the substream and verify that the Snap has the proper permission.Additionally this PR adds a example Snap for usage of this API, that can leverage Ethereum and Solana APIs at once. It also adds limited simulation support for the multichain API. The simulation framework implements a basic version of the multichain API where sessions are tracked and requests are routed to supported EVM providers. There are no underlying providers for non-EVM request, but they can be mocked.
Breaking: This PR changes the default accounts used in
snaps-jestto match the accounts derived from the default SRP.Note
Adds first-class Multichain API support across runtime, RPC, SDK, simulation, and examples.
snap.requestmultichain calls via newmetamask-multichain-providersubstream; addisMultichainRequestand stream wiring inBaseSnapExecutor.endowment:multichain-providerand register builder; expose in permissions listing/tests.wallet_createSession,wallet_getSession,wallet_invokeMethod,wallet_revokeSessionrequest/response types.wallet_invokeMethodrouting; provider now respects CAIP-2scope(EVM) and ignores non‑EVM; integrates CAIP‑25 caveat validation and simulated accounts; updates tests and defaults.@metamask/multichain-provider-example-snap(EVM + Solana) with E2E tests; added UI in test-snaps to create/revoke sessions, switch chains, and sign.Written by Cursor Bugbot for commit 17795ea. This will update automatically on new commits. Configure here.