The Fadroma Guide
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Getting started

Fadroma is an application framework for the CosmWasm Compute module. Fadroma includes Rust libraries for writing smart contracts and a TypeScript system for building, deploying, and interacting with them.

Our operational model treats the blockchain as a seamless compute substrate, and contracts as akin to persistent objects.

The above properties make CosmWasm smart contracts a very interesting proposition for running standalone business logic with programmable privacy/transparency properties. Fadroma provides the orchestration system for leveraging the full capabilities of smart contract-based systems over the entire development lifecycle.

Supported platforms

The @fadroma/connect package library serves as an index of all supported connection targets.

Secret Network

The @fadroma/scrt package package implements support for Secret Network.

Other CosmWasm chains

Planned. See issue #148.

Non-CosmWasm chains

Under consideration.

Project structure

The default structure of a project is implemented by the Project class. Projects created by Fadroma are polyglot Rust/TypeScript repositories.

See the Fadroma Project Guide for more info.

Create project with NPX

If you have Node.js set up, you can use the npx command to create a new Fadroma project:

$ npx @hackbg/fadroma@latest create

This will download the latest version of the @hackbg/fadroma package, and run the fadroma create command from it, which will create a new project using an interactive console-based wizard.

When creating a project, you will be able to define an initial set of contracts.

Nix support

Nix is a functional package manager. Fadroma can optionally use Nix to provide you with a stable development environment.

If you use Nix, you can create a project with:

$ nix-shell -c fadroma create

A temporary Fadroma shell can be entered with with:

$ nix-shell

The project wizard creates Fadroma projects with a default shell.nix. From the project's root directory, you can enter the project's Nix shell with just:

$ nix-shell

Or, from any other directory:

$ nix-shell /my/project/shell.nix

Nix will download tools like Node, Rust, Fadroma, etc., and will start a new shell session in an environment where these tools are available globally.

Writing smart contracts

A contract is your basic unit of domain logic. They are very much like persistent objects that communicate with each other, and respond to the outside world, via message passing.

Macro DSL

The fadroma-dsl crate implements a family of procedural macros for clean, boilerplate-free implementation of smart contract internals,


The fadroma crate contains a set of libraries for writing smart contracts.


Having written a contract, you need to compile it and instantiate it on a chain.

To build the entire project:

$ npm exec fadroma build

To build specific contracts:

$ npm exec fadroma build CONTRACT [CONTRACT...]

In the above invocation, CONTRACT corresponds to a key of templates in the project's fadroma.json.

The Fadroma Build Guide contains more info on configuring builds.

Testing with Ensemble

Fadroma Ensemble is a library for for integration testing of multiple contracts.

Deploying and scripting

Deploy CLI

The fadroma deploy command deploys the current project:

$ npm exec fadroma deploy

Note: the above will fail if the FADROMA_CHAIN variable is not set.

For convenience, the project creation tool registers aliases in the scripts field of the project's package.json with corresponding values of FADROMA_CHAIN, so that you can deploy with:

$ npm run mainnet deploy
$ npm run testnet deploy
$ npm run devnet deploy
$ npm run mocknet deploy

Running scripts

The @hackbg/ganesha package enables Fadroma CLI to compile TypeScript on demand. You can use TypeScript seamlessly in your deploy procedures:

$ fadroma run script.js
$ fadroma run script.ts

Adding commands

The @hackbg/cmds package allows Fadroma CLI to parse commands. This is a simple and loose command parser which descends a tree of command definitions, and maps to a regular JS function call.

The default project contains examples for extending project commands (such as deploy), as well as defining new ones.

Agent API

The @fadroma/agent package is our core library for interfacing with blockchains and smart contracts from JavaScript or TypeScript.

The Fadroma Agent Guide describes it in more detail.

Deploy API

The Deployment class, as extended in the default project's api.ts, is the backbone of the Fadroma Deploy API.

The Fadroma Deploy Guide describes that part of the functionality.

Testing with Devnet

By default, Fadroma deploys to a devnet: a local instance of a blockchain, running in a Docker or Podman container.

The Fadroma Devnet Guide has more info on the subject of devnets.

Testing with Mocknet

The Fadroma Mocknet guide describes our simulated environment for fast full-stack testing of production WASM builds. Mocknet is built into @fadroma/agent.

More resources