We are going to upgrade relay.flashbots.net to JSON-RPC compatible errors on January 9th, 2025.
Context
Due to historic reasons, the Flashbots bundle-relay (relay.flashbots.net) returns errors in a non-standard way.
Sometimes errors are returned like this:
{
"error": "example error"
}
Under rare circumstances, errors are returned like this:
{
"code": -32603,
"message": "example error"
}
The proper way to respond with error (according to JSON-RPC spec) is:
{
"jsonrpc":"2.0",
"id": 123,
"error": {
"code": -32603,
"message": "example error"
}
}
Impact
Depending on the implementation in Flashbots relay clients, errors will be returned in a different format, as regular JSON-RPC errors would be.
Most tooling won’t need any update because JSON-RPC compatible errors are already handled. It might only impact any Flashbots-specific error handling logic, and we recommend client developers to double-check the code, and update if needed.