> For the complete documentation index, see [llms.txt](https://docs.bloxroute.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bloxroute.com/eth/block-builders-and-validators/preconfirmations.md).
# Preconfirmations
***
### Primev Integration
#### About Primev
**Primev** is an infrastructure provider offering pre-confirmation capabilities on Ethereum. They operate a custom chain alongside a set of Ethereum smart contracts to coordinate builder and validator participation in their preconf ecosystem.
#### Our Integration
**Validator Tracking (Ethereum Mainnet)**
* We reference Primev’s validator opt-in contract on Ethereum Mainnet:\
`0x821798d7b9d57dF7Ed7616ef9111A616aB19ed64`
* A helper function is used to query validator participation status.
* This contract maintains a list of validators who have opted into Primev’s pre-confirmation program.
**Builder Tracking (Primev Custom Chain)**
* Primev maintains a contract on their own chain to track builder opt-in status:\
`0xb772Add4718E5BD6Fe57Fb486A6f7f008E52167E`
* Builders are mapped to externally owned accounts (EOAs) via a helper function that converts their public key to an address.
* We query this contract through their public RPC endpoint:\
`wss://chainrpc-wss.mev-commit.xyz`
**Validation Checks**
* Once per epoch, we validate the opt-in status of all known validators and builders.
* This polling-based model ensures data consistency without requiring persistent event listeners.
***
### Chainbound Integration
#### About Chainbound
**Chainbound** is another provider building a pre-confirmation solution for Ethereum, called **Commit-Boost**. Their focus is on enabling block builders to provide pre-confirmations directly to searchers and users, without requiring validator coordination. Chainbound’s architecture is designed to integrate seamlessly with builder workflows, offering lighter-weight guarantees and flexible integration points.
#### Our Integration
We’ve added support for Chainbound’s Commit-Boost protocol within our pre-confirmation infrastructure. It allows validators to manage proposer commitments—such as pre-confirmations—using a modular and extensible framework, without requiring coordination with external contracts or RPC endpoints.
Commit-Boost is designed to:
* Run as a sidecar next to MEV-Boost or without.
* Provide a unified platform for validator commitments (e.g., inclusion guarantees, blockspace futures).
* Be extensible via plug-and-play modules.
* Avoid fragmentation or duplicated infrastructure.
***
### Technical References
**Primev:**
* RPC endpoint: `wss://chainrpc-wss.mev-commit.xyz`
* Validator opt-in contract: `0x821798d7b9d57dF7Ed7616ef9111A616aB19ed64`
* Builder opt-in contract (Primev chain): `0xb772Add4718E5BD6Fe57Fb486A6f7f008E52167E`
**Chainbound:**
* No RPC endpoint or smart contract required.
* Uses Commit-Boost sidecar alongside or independent off MEV-Boost.
***
If you're a builder and would like to begin submitting pre-confirmations via bloXroute’s infrastructure, reach out to `support@bloxroute.com` for integration support, specs, and test endpoints.
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