feat: adds a flashbots provider #158
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- adds a Flashbots provider with the alloy MEV API extensions - adds the logic for building Flashbots bundles in the builder - adds the Flashbots submission task
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dylanlott
commented
Oct 8, 2025
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| Ok(Some(hash)) => { | ||
| tracing::info!(host_block_number = sim_result.host_block_number(), bundle_hash = ?hash, "bundle submitted to flashbots"); | ||
| span_debug!(span, "bundle submitted to flashbots"); | ||
| } | ||
| Ok(None) => { | ||
| tracing::info!( | ||
| host_block_number = sim_result.host_block_number(), | ||
| "bundle submitted to flashbots without error" | ||
| ); | ||
| }) | ||
| .inspect_err(|err| { | ||
| span_error!(span, %err, "failed to send bundle to Flashbots"); | ||
| }); | ||
| span_debug!(span, "bundle submitted to flashbots"); | ||
| } |
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There is some weirdness here because the rbuilder response doesn't adhere to the Flashbots spec and returns a completely empty response instead of a bundle hash when successfully submitted, but we also want to handle the case where the endpoint does return the expected response. So we log both.
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feat: adds a Flashbots provider and submitter
This PR adds a Flashbots provider and submit task to the Builder.
It configures the Flashbots provider from the configured relay URL and uses the builder's signer key to sign all of the bundles it submits to Flashbots.
The Flashbots
rbuilder endpoint on Pecorino does not return a properEthBundleHash when a bundle is submitted, in fact it simply returns an empty response upon success. The endpoint also does not support simulation, so the Flashbots submit task blindly sends the prepared bundle and logs any errors that are returned.Closes ENG-1414