chore: add MegaETH Testnet v2
#7272
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Pull request overview
This PR adds support for MegaETH Testnet v2 as a custom network and migrates Monad Testnet from a custom network to an Infura-supported network. The changes update network type definitions, chain IDs, RPC endpoints, block explorers, and corresponding test snapshots.
- Adds
megaeth-testnet-v2toCustomNetworkTypewith chain ID0x18c7and deprecates the originalmegaeth-testnet - Moves
monad-testnetfromCustomNetworkTypetoInfuraNetworkTypewith chain ID0x279f - Updates test snapshots to reflect the new Monad Testnet Infura network configuration
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/controller-utils/src/types.ts | Adds monad-testnet to InfuraNetworkType, adds megaeth-testnet-v2 to CustomNetworkType with deprecation notices, and updates related enums (BuiltInNetworkName, ChainId, NetworksTicker, BlockExplorerUrl, NetworkNickname) |
| packages/controller-utils/src/constants.ts | Adds RPC endpoint for megaeth-testnet-v2 and ticker symbol, updates BUILT_IN_NETWORKS configuration |
| packages/controller-utils/CHANGELOG.md | Documents addition of monad-testnet to InfuraNetworkType |
| packages/network-controller/tests/NetworkController.test.ts | Updates test snapshots to include Monad Testnet as an Infura network with expected configuration |
| packages/assets-controllers/src/TokenDetectionController.test.ts | Adds Monad Testnet chain ID to token detection test expectations |
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cryptodev-2s
reviewed
Dec 8, 2025
| * @deprecated Please use `megaeth-testnet-v2` instead. | ||
| */ | ||
| 'megaeth-testnet': 'https://carrot.megaeth.com/rpc', | ||
| 'megaeth-testnet-v2': 'https://timothy.megaeth.com/rpc', |
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@stanleyyconsensys Is there any reason we wouldn’t simply update the previous one? Or were you concerned this might introduce a breaking change?
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NVM, I see now that this isn’t the only change; the chainId is also being updated.
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Yea, it is kind of a new network,
+
we try to avoid controller-utils breaking change, as it will introduce breaking change for many controllers
and soon we will introduce a new controller to store the information remotely
mcmire
reviewed
Dec 9, 2025
Comment on lines
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| - Add MegaETH Testnet V2 support ([#7272](https://github.com/MetaMask/core/pull/7272)) | ||
| - Add `megaeth-testnet-v2` in method `getDefaultCustomNetworkConfigurationsByChainId` | ||
| - Add `megaeth-testnet-v2` in type `AdditionalDefaultNetwork` |
Contributor
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Both of these are internal functions/types. It would be better to mention the behavior that consumers would see.
I think we can capture this by saying:
Suggested change
| - Add MegaETH Testnet V2 support ([#7272](https://github.com/MetaMask/core/pull/7272)) | |
| - Add `megaeth-testnet-v2` in method `getDefaultCustomNetworkConfigurationsByChainId` | |
| - Add `megaeth-testnet-v2` in type `AdditionalDefaultNetwork` | |
| - Add MegaETH Testnet "v2" as a default custom network ([#7272](https://github.com/MetaMask/core/pull/7272)) | |
| - The URL for this is `https://timothy.megaeth.com/rpc` rather than `https://carrot.megaeth.com/rpc`, and the chain ID has changed from `0x18c6` to `0x18c7`. | |
| - "v1" of this network has not been removed. |
| ### Added | ||
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| - Add `monad-testnet` to `InfuraNetworkType` ([#7067](https://github.com/MetaMask/core/pull/7067)) | ||
| - Add MegaETH Testnet V2 to various constants, enums, and types ([#7272](https://github.com/MetaMask/core/pull/7272)) |
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Nit: Should we put V2 in quotes?
Suggested change
| - Add MegaETH Testnet V2 to various constants, enums, and types ([#7272](https://github.com/MetaMask/core/pull/7272)) | |
| - Add MegaETH Testnet "v2" to various constants, enums, and types ([#7272](https://github.com/MetaMask/core/pull/7272)) |
| - Add `monad-testnet` to `InfuraNetworkType` ([#7067](https://github.com/MetaMask/core/pull/7067)) | ||
| - Add MegaETH Testnet V2 to various constants, enums, and types ([#7272](https://github.com/MetaMask/core/pull/7272)) | ||
| - Add `megaeth-testnet-v2` to `BUILT_IN_NETWORKS` | ||
| - Add `megaeth-testnet-v2` and `megaeth-testnet` to `BUILT_IN_CUSTOM_NETWORKS_RPC` |
Contributor
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Wasn't megaeth-testnet already present?
Suggested change
| - Add `megaeth-testnet-v2` and `megaeth-testnet` to `BUILT_IN_CUSTOM_NETWORKS_RPC` | |
| - Add `megaeth-testnet-v2` to `BUILT_IN_CUSTOM_NETWORKS_RPC` |
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Explanation
Due to the deprecation of MegaETH testnet v1 (chainId 0x18c6)
This PR Adds MegaETH Testnet V2 (chainId 0x18c7) across constants/types and default custom networks.
Add
megaeth-testnet-v2to controller-utils constants/types:Include
megaeth-testnet-v2in NetworkController:References
Checklist
Note
Adds
megaeth-testnet-v2(chainId0x18c7) across constants/types and default custom networks; marksmegaeth-testnetv1 as deprecated.megaeth-testnet-v2toBUILT_IN_NETWORKS,BUILT_IN_CUSTOM_NETWORKS_RPC(https://timothy.megaeth.com/rpc),BuiltInNetworkName,ChainId(0x18c7),NetworksTicker,BlockExplorerUrl(https://megaeth-testnet-v2.blockscout.com), andNetworkNickname.megaeth-testnetreferences acrossBUILT_IN_CUSTOM_NETWORKS_RPC,CustomNetworkType,BuiltInNetworkName,ChainId,NetworksTicker,BlockExplorerUrl,NetworkNickname.ChainId['megaeth-testnet-v2']in default custom networks viagetDefaultCustomNetworkConfigurationsByChainId.AdditionalDefaultNetworkto allow'megaeth-testnet-v2'.Written by Cursor Bugbot for commit fbe53bc. This will update automatically on new commits. Configure here.