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5 changes: 5 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,11 @@ Engine is an open-source, backend HTTP server that provides a production-ready i
- Other deployment options
- [Deploy on Railway](https://railway.app/template/fcEVay)

## Notes on custom chains

- Chain overrides let Engine resolve custom EVM chains for standard reads, writes, and deployments.
- Smart wallet / UserOp routes still depend on thirdweb bundler support for the target chain. A chain override alone does not enable hosted bundler or paymaster infrastructure for that chain.

## Contributing

We welcome your contributions! See [how to contribute](./contributing.md).
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2 changes: 1 addition & 1 deletion src/server/middleware/error.ts
Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ export const badAddressError = (address: string): CustomError =>

export const badChainError = (chain: string | number): CustomError =>
createCustomError(
`Invalid chain: ${chain}. If this is a custom chain, add it to chain overrides.`,
`Invalid chain: ${chain}. If this is a custom chain, add it to chain overrides. Smart wallet and UserOp routes also require bundler support for that chain.`,
StatusCodes.BAD_REQUEST,
"INVALID_CHAIN",
);
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