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wip: Add multichain API support for Snaps #39071

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wip: Add multichain API support for Snaps
FrederikBolding Jan 7, 2026
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FrederikBolding Jan 7, 2026
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340 changes: 340 additions & 0 deletions .yarn/patches/@metamask-snaps-execution-environments-npm-10.3.0-75e3841f68.patch
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843 changes: 843 additions & 0 deletions .yarn/patches/@metamask-snaps-rpc-methods-npm-14.1.1-ac6ae2a3ba.patch
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15 changes: 15 additions & 0 deletions app/scripts/controller-init/snaps/execution-service-init.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,11 +9,16 @@
import { ControllerInitFunction } from '../types';
import { isManifestV3 } from '../../../../shared/modules/mv3.utils';
import { ExecutionServiceMessenger } from '../messengers/snaps';
import { setupMultiplex } from '../../lib/stream-utils';
import {
METAMASK_CAIP_MULTICHAIN_PROVIDER,
METAMASK_EIP_1193_PROVIDER,
} from '../../constants/stream';

/**

Check failure on line 18 in app/scripts/controller-init/snaps/execution-service-init.ts

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GitHub Actions / test-lint / Test lint 

Missing JSDoc @param "request.setupUntrustedCommunicationCaip" declaration
* Initialize the Snaps execution service.
*
* @param request - The request object.

Check failure on line 21 in app/scripts/controller-init/snaps/execution-service-init.ts

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GitHub Actions / test-lint / Test lint 

Missing @param "request.setupUntrustedCommunicationCaip"
* @param request.controllerMessenger - The messenger to use for the service.
* @param request.offscreenPromise - The promise that resolves when the
* offscreen document is ready.
Expand All @@ -28,6 +33,7 @@
controllerMessenger,
offscreenPromise,
setupUntrustedCommunicationEip1193,
setupUntrustedCommunicationCaip,
}) => {
const useOffscreenDocument =
isManifestV3 &&
Expand All @@ -46,6 +52,15 @@
sender: { snapId },
subjectType: SubjectType.Snap,
});

const mux = setupMultiplex(connectionStream);
mux.ignoreStream(METAMASK_EIP_1193_PROVIDER);

setupUntrustedCommunicationCaip({
connectionStream: mux.createStream(METAMASK_CAIP_MULTICHAIN_PROVIDER),
sender: { snapId },
subjectType: SubjectType.Snap,
});
}

if (useOffscreenDocument) {
Expand Down
2 changes: 2 additions & 0 deletions app/scripts/metamask-controller.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9438,6 +9438,8 @@ export default class MetamaskController extends EventEmitter {
removeAllConnections: this.removeAllConnections.bind(this),
setupUntrustedCommunicationEip1193:
this.setupUntrustedCommunicationEip1193.bind(this),
setupUntrustedCommunicationCaip:
this.setupUntrustedCommunicationCaip.bind(this),
setLocked: this.setLocked.bind(this),
showNotification: this.platform._showNotification,
showUserConfirmation: this.opts.showUserConfirmation,
Expand Down
4 changes: 2 additions & 2 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -373,8 +373,8 @@
"@metamask/signature-controller": "^38.0.0",
"@metamask/smart-transactions-controller": "^21.0.0",
"@metamask/snaps-controllers": "^17.2.0",
"@metamask/snaps-execution-environments": "^10.3.0",
"@metamask/snaps-rpc-methods": "^14.1.1",
"@metamask/snaps-execution-environments": "patch:@metamask/snaps-execution-environments@npm%3A10.3.0#~/.yarn/patches/@metamask-snaps-execution-environments-npm-10.3.0-75e3841f68.patch",
"@metamask/snaps-rpc-methods": "patch:@metamask/snaps-rpc-methods@npm%3A14.1.1#~/.yarn/patches/@metamask-snaps-rpc-methods-npm-14.1.1-ac6ae2a3ba.patch",
"@metamask/snaps-sdk": "^10.3.0",
"@metamask/snaps-utils": "^11.7.0",
"@metamask/solana-wallet-snap": "^2.5.1",
Expand Down
47 changes: 41 additions & 6 deletions yarn.lock
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Expand Up @@ -8327,7 +8327,7 @@ __metadata:
languageName: node
linkType: hard

"@metamask/snaps-execution-environments@npm:^10.3.0":
"@metamask/snaps-execution-environments@npm:10.3.0":
version: 10.3.0
resolution: "@metamask/snaps-execution-environments@npm:10.3.0"
dependencies:
Expand All @@ -8345,6 +8345,24 @@ __metadata:
languageName: node
linkType: hard

"@metamask/snaps-execution-environments@patch:@metamask/snaps-execution-environments@npm%3A10.3.0#~/.yarn/patches/@metamask-snaps-execution-environments-npm-10.3.0-75e3841f68.patch":
version: 10.3.0
resolution: "@metamask/snaps-execution-environments@patch:@metamask/snaps-execution-environments@npm%3A10.3.0#~/.yarn/patches/@metamask-snaps-execution-environments-npm-10.3.0-75e3841f68.patch::version=10.3.0&hash=516850"
dependencies:
"@metamask/json-rpc-engine": "npm:^10.1.0"
"@metamask/object-multiplex": "npm:^2.1.0"
"@metamask/post-message-stream": "npm:^10.0.0"
"@metamask/providers": "npm:^22.1.1"
"@metamask/rpc-errors": "npm:^7.0.3"
"@metamask/snaps-sdk": "npm:^10.2.0"
"@metamask/snaps-utils": "npm:^11.6.2"
"@metamask/superstruct": "npm:^3.2.1"
"@metamask/utils": "npm:^11.8.1"
readable-stream: "npm:^3.6.2"
checksum: 10/15359d81f93130ee457763ddea6d5f928f61e3cd2c3e549061907332ec6cc97d0a16b2990266652df3ba76fedf66bc8b543ad9e235bb8183f3faf6090cdbf698
languageName: node
linkType: hard

"@metamask/snaps-registry@npm:^3.2.3":
version: 3.3.0
resolution: "@metamask/snaps-registry@npm:3.3.0"
Expand All @@ -8369,6 +8387,23 @@ __metadata:
languageName: node
linkType: hard

"@metamask/snaps-rpc-methods@npm:14.1.1, @metamask/snaps-rpc-methods@npm:^14.1.1":
version: 14.1.1
resolution: "@metamask/snaps-rpc-methods@npm:14.1.1"
dependencies:
"@metamask/key-tree": "npm:^10.1.1"
"@metamask/permission-controller": "npm:^12.1.0"
"@metamask/rpc-errors": "npm:^7.0.3"
"@metamask/snaps-sdk": "npm:^10.1.0"
"@metamask/snaps-utils": "npm:^11.6.1"
"@metamask/superstruct": "npm:^3.2.1"
"@metamask/utils": "npm:^11.8.1"
"@noble/hashes": "npm:^1.7.1"
async-mutex: "npm:^0.5.0"
checksum: 10/871c50f20e6427bcb14d30648bca2867725cc8ef6df579ef8951481f9919ebed2a7713dd821c94666829e240df6ceeb6181a0203fe18413e20a7ff45b1b29895
languageName: node
linkType: hard

"@metamask/snaps-rpc-methods@npm:^13.5.0":
version: 13.5.3
resolution: "@metamask/snaps-rpc-methods@npm:13.5.3"
Expand All @@ -8385,9 +8420,9 @@ __metadata:
languageName: node
linkType: hard

"@metamask/snaps-rpc-methods@npm:^14.1.1":
"@metamask/snaps-rpc-methods@patch:@metamask/snaps-rpc-methods@npm%3A14.1.1#~/.yarn/patches/@metamask-snaps-rpc-methods-npm-14.1.1-ac6ae2a3ba.patch":
version: 14.1.1
resolution: "@metamask/snaps-rpc-methods@npm:14.1.1"
resolution: "@metamask/snaps-rpc-methods@patch:@metamask/snaps-rpc-methods@npm%3A14.1.1#~/.yarn/patches/@metamask-snaps-rpc-methods-npm-14.1.1-ac6ae2a3ba.patch::version=14.1.1&hash=c129f6"
dependencies:
"@metamask/key-tree": "npm:^10.1.1"
"@metamask/permission-controller": "npm:^12.1.0"
Expand All @@ -8398,7 +8433,7 @@ __metadata:
"@metamask/utils": "npm:^11.8.1"
"@noble/hashes": "npm:^1.7.1"
async-mutex: "npm:^0.5.0"
checksum: 10/871c50f20e6427bcb14d30648bca2867725cc8ef6df579ef8951481f9919ebed2a7713dd821c94666829e240df6ceeb6181a0203fe18413e20a7ff45b1b29895
checksum: 10/58896123692fdc87a3c1bdef32159806eada96ff6a248f9161947fa30cd967b0f2d992b31fd78b4dbb16d74801462475a4496232679911d7e01a5e0d072ccb10
languageName: node
linkType: hard

Expand Down Expand Up @@ -32913,8 +32948,8 @@ __metadata:
"@metamask/snap-account-abstraction-keyring-site": "npm:^1.0.0"
"@metamask/snap-simple-keyring-site": "npm:^2.0.0"
"@metamask/snaps-controllers": "npm:^17.2.0"
"@metamask/snaps-execution-environments": "npm:^10.3.0"
"@metamask/snaps-rpc-methods": "npm:^14.1.1"
"@metamask/snaps-execution-environments": "patch:@metamask/snaps-execution-environments@npm%3A10.3.0#~/.yarn/patches/@metamask-snaps-execution-environments-npm-10.3.0-75e3841f68.patch"
"@metamask/snaps-rpc-methods": "patch:@metamask/snaps-rpc-methods@npm%3A14.1.1#~/.yarn/patches/@metamask-snaps-rpc-methods-npm-14.1.1-ac6ae2a3ba.patch"
"@metamask/snaps-sdk": "npm:^10.3.0"
"@metamask/snaps-utils": "npm:^11.7.0"
"@metamask/solana-wallet-snap": "npm:^2.5.1"
Expand Down
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