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Reth Exex Examples

Reth Exex Examples is a Rust repository of sample execution extensions built on Reth, demonstrating patterns for chain events, block backfills, state tracking, gRPC notifications, Optimism bridge receipt decoding, oracle attestation and rollup state derived from L1.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Reth Exex Examples — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use the repository when you need a concrete Rust example to study or adapt for an ExEx that works with a Reth node, particularly for event handling, RPC backfills, notification transport or L1-related patterns.

Who it is for

  • Rust developers exploring how to build execution extensions for Reth.
  • Developers seeking example patterns for chain monitoring, backfills, notifications, bridge receipts, oracle behavior or rollup state.

Documented uses

  • Observe and log chain commits, reorgs and reverts.
  • Expose an RPC operation to backfill a range of blocks.
  • Send execution-extension notifications through gRPC and receive them with a client.
  • Track plain state in memory or derive rollup state from L1.
  • Decode Optimism deposit and withdrawal receipts from L1.
Before you choose

Requirements & limits

The repository is public and dual-licensed under Apache-2.0 or MIT. The documented examples are launched with Cargo commands.

  • Examples are built on Reth and written in Rust.
  • The backfill example requires a Reth HTTP RPC endpoint on port 8545 for the documented command sequence.
  • The collection spans multiple patterns; choose an individual example based on the task rather than treating it as a single hosted application.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Run the documented block-range backfill example

Start the example Reth node with HTTP RPC and request execution of the most recent ten blocks.

Before you start

  • Rust and Cargo, for the documented cargo run commands.
  • A local Reth node with HTTP RPC enabled on port 8545.
  • The README's cast commands and ETH_RPC_URL environment variable.

Steps

  1. From the repository, run the command below to start Reth with an HTTP RPC endpoint on port 8545.

    Documented command
    cargo run --bin backfill -- node --http

  2. Set ETH_RPC_URL=http://localhost:8545, obtain the current block number with cast bn, and set it as TIP.

  3. Call cast rpc backfill_start $(($TIP - 10)) $TIP to request backfill of the last ten blocks.

Expected outcome

The example's RPC is asked to backfill (execute) the selected block range.

Guide limitations

  • The documented sequence depends on a local Reth HTTP RPC endpoint at port 8545.
  • The guide describes the repository's documented commands, not a separately verified execution.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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Sources checked
12 October 2026
Original website title
paradigmxyz/reth-exex-examples · Official homepage title · retained in its source language
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