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Smplx

Smplx is a Rust-based development framework for SimplicityHL smart contracts, with a CLI for project management, dependency installation and builds, plus tools for unit testing, fuzz testing, and local Liquid integration testing.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Smplx — 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 Smplx when developing SimplicityHL contracts and you want a CLI workflow covering project setup, dependencies, builds, testing, and local Liquid integration testing.

Who it is for

  • Developers building SimplicityHL smart contracts for Liquid.
  • Rust developers who want project, dependency, build, and test tooling for Simplicity contracts.

Documented uses

  • Initialize and manage a Simplicity-based project.
  • Install SimplicityHL dependencies.
  • Build contract files into generated artifacts.
  • Run contract tests and fuzz tests.
  • Set up local Elements and Electrs nodes for integration testing.
Before you choose

Requirements & limits

The framework is distributed as an open-source Rust project under the MIT license.

  • A simplex.toml file is required in the project root.
  • The configuration supports Liquid, LiquidTestnet, and ElementsRegtest test-network values.
  • Local integration testing uses Elements and Electrs; test configuration can also specify Esplora and Elements RPC endpoints.
  • The README warns that the framework is at an extremely early development stage, with breaking changes and critical bugs expected.

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

Set up a Smplx project

Install the framework tooling, add its standard dependency, and initialize a project.

Before you start

  • A Rust development environment with Cargo.

Steps

  1. Install using the documented installer command: the command below.

    Documented command
    curl -L https://smplx.simplicity-lang.org | bash

  2. Run simplexup.

  3. Add the development dependency with the command below.

    Documented command
    cargo add --dev smplx-std

  4. Initialize a project with simplex init .

Expected outcome

A new Smplx project initialized with the `smplx-std` development dependency.

Guide limitations

  • The project requires a simplex.toml file in the project root for framework use.
  • The README warns that the framework is at an extremely early stage and breaking changes and critical bugs are expected.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
9 October 2026
Original website title
BlockstreamResearch/smplx · Official homepage title · retained in its source language
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