Sutra: Elixir SDK for Cardano

[Proposal setup] Proposal title

Please provide your proposal title

Sutra: Elixir SDK for Cardano

[Proposal Summary] Budget Information

Enter the amount of funding you are requesting in ADA

90800

[Proposal Summary] Time

Please specify how many months you expect your project to last

8

[Proposal Summary] Translation Information

Please indicate if your proposal has been auto-translated

No

Original Language

en

[Proposal Summary] Problem Statement

What is the problem you want to solve?

Cardano lacks an SDK for Elixir/Erlang off-chain development, blocking Elixir developers from joining the ecosystem and building dApps.

[Proposal Summary] Supporting Documentation

Supporting links

• https://sutra.txbody.io
,
• https://github.com/txbody-org/sutra-cardano

[Proposal Summary] Project Dependencies

Does your project have any dependencies on other organizations, technical or otherwise?

No

Describe any dependencies or write 'No dependencies'

No dependencies

[Proposal Summary] Project Open Source

Will your project's outputs be fully open source?

Yes

License and Additional Information

project is already opensourced with MIT license

[Theme Selection] Theme

Please choose the most relevant theme and tag related to the outcomes of your proposal

Developer Tools

[Campaign Category] Category Questions

Mention your open source license and describe your open source license rationale.

The Sutra SDK is released under the MIT License

The MIT license places minimal restrictions on how developers and organizations can use, modify, and distribute the Sutra SDK. This removes all barriers to adoption, allowing both individual developers and enterprise teams to integrate the SDK into their projects without legal concerns or licensing compliance overhead.

How do you make sure your source code is accessible to the public from project start, and people are informed?

We have already started working on this project though we were not funded in fund 13. we started contributing to codebase with public repository fom day 1.

Code is already public here - https://github.com/txbody-org/sutra-cardano

How will you provide high quality documentation?

We will be using Elixir HexDocs ( @doc , @moduledoc) to write documentation & guides for each module and function. HexDocs will compile this documentation and deploy to https://hexdocs.pm/

once package is uploaded to Hex package manager documentation is auto generated. here is example documentation of Elixir using Hex https://hexdocs.pm/elixir/introduction.html

we will have similar documentation generated using Hex

[Your Project and Solution] Solution

Please describe your proposed solution and how it addresses the problem

The Sutra SDK brings native Cardano blockchain capabilities to Elixir, enabling developers to build robust, scalable dApps using familiar Elixir patterns. This open-source toolkit provides comprehensive libraries and tools for seamless Cardano integration, backed by comprehensive documentation and developer-friendly APIs.

Built on the Erlang Virtual Machine (BEAM), applications leverage Elixir's inherent strengths for blockchain development:

• 🔧 Fault Tolerance: Supervision trees automatically restart and recover failed process, ensuring transaction reliability and system resilience without manual intervention.
• ⚡ Real-time Scalability: Phoenix Channels enable real-time client updates, supporting over 2 million concurrent WebSocket connections on a single machine for high-performance dApp interfaces.
• 🤖 Code Generation: Automated boilerplate generation from Plutus blueprint files streamlines development, reducing manual coding and accelerating time-to-market.
• 🧪 Comprehensive Testing: Native ExUnit integration supports both emulator and private network testing, enabiling robust test-driven development workflows.
• 💻 Rich User Experience: LiveView integration delivers real-time, interactive web applications rended server-side, combining blockchian functionality with modern UX patterns.

[Your Project and Solution] Impact

Please define the positive impact your project will have on the wider Cardano community

The Sutra SDK enables developers to build Cardano off-chain transactions in Elixir with seamless wallet API integration and real-time messaging via Phoenix Channels.

The SDK can also be used as intelligent code generator that transforms Plutus blueprints into production-ready code:

mix sutra.gen.offchain /path/to/plutus.json

This command automatically generates type definitions, API endpoints, and UI components, dramatically accelerating development cycles.

Impact on the Cardano Ecosystem

• Developer Growth: Attracts the thriving Elixir community to Cardano, expanding the developer talent pool with experienced functional programmers already familiar with concurrent, fault-tolerant systems**.**
• Simplified Development: Automated code generation and familiar Elixir patterns lower the barrier to entry, enabling rapid prototyping and faster time-to-market for Cardano applications.
• Enterprise Adoption: BEAM's proven scalability and fault-tolerance make Cardano accessible to businesses requiring mission-critical blockchain solutions, driving institutional adoption.
• Real-time Innovation: Phoenix Channels unlock new dApp categories with instant user feedback, enabling gaming, trading platforms, and collaborative applications previously difficult to build on blockchain.
• Reliability & Trust: Built-in ExUnit testing and supervision trees ensure robust applications, improving user confidence and ecosystem reputation through higher-quality dApps.
• Community Collaboration: Open-source development fosters knowledge sharing and collective innovation, strengthening Cardano's technical foundation through community contributions.

Sutra SDK streamlines Cardano off-chain development by bringing familiar Elixir patterns to transaction building and wallet integration, while on-chain logic remains in Plutus. This accelerates ecosystem growth by making the off-chain development experience accessible and productive for Elixir developers.

[Your Project and Solution] Capabilities & Feasibility

What is your capability to deliver your project with high levels of trust and accountability? How do you intend to validate if your approach is feasible?

We are the team with a strong foundation in Elixir & cardano development.

We have worked on a production ready Web3 project

1. Iagon https://iagon.com/
2. Nuvola https://www.nuvoladigital.io/

We are also composed of a team with strong knowledge on fullstack as well as mobile application development.

Our team involves in:

Cardano Development

• Piyush has worked extensively on cardano projects for more than five years. He is skilled in smart contract development using both Aiken and Plutus, and he is the author and core maintainer of the Cardano Elixir SDK (https://github.com/txbody-org/sutra-cardano )

Full Stack Development

• Aayush is an experienced Elixir developer with more than six years in software development. He has built fullstack applications and mobile apps, combining backend, frontend, and mobile expertise to create complete solutions. He is also a contributor to the cardano elixir sdk.

We are a team with a strong foundation in Cardano development, fullstack web, and mobile application development and bring deep technical expertise across multiple software domains. Our team has over five years of experience in Cardano projects, specializing in smart contract development using both Aiken and Plutus. We are also composed of a team with strong knowledge on fullstack as well as mobile application development.

The team's dedication to the Cardano ecosystem extends beyond funded projects. Despite the Sutra SDK not receiving funding in Fund13, the team continued development independently. The SDK is currently being integrated into the upcoming Nuvola Digital application, showcasing its practical value and the team's perseverance.

[Milestones] Project Milestones

Milestone Title

Design API Spec, Types & Encoding / Decoding of Types to Plutus Data (40% completed)

Milestone Outputs

• Type System Architecture: Robust type definitions supporting complex Cardano data structures using defenum & defdata macro
• Automatic Encoding/Decoding: Seamless conversion between native types and Plutus Data format

Acceptance Criteria

• Documentation to define Data Types with example code
• defenum & defdata macro successfully defines enumeration types with automatic Plutus Data encoding
• Represent (OutputReference, Input, Output, Address, Datum) using defdata & defEnum macro

Evidence of Completion

• Clear Test Code to encode & decode some aiken stdlib types. (OutputReference, Address, Datum, Output, Input)

Delivery Month

1

Cost

16000

Progress

20 %

Milestone Title

Provider & Chain Indexer Integration (50% completed)

Milestone Outputs

• Allows querying UTXO & Submit Transaction
• Define Protocol to inject custom provider easily

Supported Providers

• Yaci Devkit - Local development chain indexer
• Maestro - Enterprise-grade Cardano API service
• Blockfrost - Popular Cardano API infrastructure
• Koios - Community-driven Cardano API layer
• Kupo & Ogmios - Lightweight chain indexer and local node interface

Acceptance Criteria

• All 5 providers (Yaci Devkit, Maestro, Blockfrost, Koios, Kupo & Ogmios) are successfully integrated and functional
• Unified API interface provides consistent method signatures across all providers
• API documentation includes examples for each supported provider
• Configuration guide explains provider setup

Evidence of Completion

• Create comprehensive Elixir demonstration scripts showcasing transaction building capabilities across all supported providers. These scripts serve as both integration validation and developer reference implementations.

Delivery Month

1

Cost

12000

Progress

30 %

Milestone Title

Tx Builder (Spend, Mint & Withdrawing) Script Purpose - 40% Completed

Milestone Outputs

Develop a comprehensive transaction builder supporting the three core Cardano script purposes:

• Spend (UTXO consumption)
• Mint (native token Minting/burning)
• Withdraw (staking reward withdrawal

Acceptance Criteria

• Successfully build transactions spending from script-locked UTXOs with provided redeemers
• Support for both inline datums and datum hash references in spend transactions
• Token Mint/Burn using both Plutus script & Native Script
• allow withdraw reward using both script & Verification key credential

Evidence of Completion

• Test cases for Spend, Mint & Withdraw action and tested against Yaci Devkit
• Test Cases is automatically Tested using Github CI & Yaci Devkit
• Mix Script file showcasing code for each purpose
• Guides & Video tutorial explaning how to build complex Transaction using Sutra TxBuilder

Delivery Month

2

Cost

22000

Progress

60 %

Milestone Title

Tx Builder (Publish, Vote & Propose) Script Purpose

Milestone Outputs

Develop advanced transaction builder capabilities supporting Cardano governance operations through:

• Publish

        1. RegisterCredential
  
        2. UnregisterCredential
  
        3. DelegateCredential
  

• Vote (governance proposal voting)

• Propose (governance proposal creation) script purposes

Acceptance Criteria

• Build transaction to allow Register , UnRegister & Delegate Credential
• Build Transaction for delegating voting to Drep
• Build tranaction to submit Vote for Gov proposals. (Abstain, Yes, No)
• Build Transaction to propose Gov Actions (TreasuryWithdrawal & Protocol params Update)

Evidence of Completion

• Test cases for Publish, Vote & Withdraw action and tested against Yaci Devkit
• Test Cases is automatically Tested using Github CI & Yaci Devkit
• Mix Script file showcasing code for each purpose
• Guides & Video tutorial explaning how to build complex Transaction using Sutra TxBuilder

Delivery Month

3

Cost

36000

Progress

90 %

Milestone Title

Phoenix LiveView Integration , Final Report and video

Milestone Outputs

Develop a comprehensive Phoenix LiveView integration supporting the CIP-30 dApp-Wallet Web Bridge standard, enabling seamless real-time interaction between Cardano wallets and web applications. This integration provides a complete frontend solution for Cardano dApp development with live updates, wallet management, and transaction handling.

Acceptance Criteria

• Phoenix LiveView application API with proper JS to integrate with LiveView
• Automatic detection of all CIP-30 compatible wallets in browser
• Wallet capability enumeration (getBalance, getUtxos, signTx, etc.)
• Address change detection and account switching
• Video showcasing how to use library and giving demo with creating & submitting simple Transaction

Evidence of Completion

• Demo application (vesting or GiftCard) example from aiken Examples made using sutra & Phoenix Liveview
• Guides & video tutorial for creating end to end Dapps using Sutra & Phoenix Liveview

Delivery Month

1

Cost

4800

Progress

100 %

[Final Pitch] Budget & Costs

Please provide a cost breakdown of the proposed work and resources

Milestone 1: Plutus Data Encoding / Decoding

• Budget: 16,000 ADA
• Contributor: Piyush & Aayush

Milestone 2: Provider Integration

• Budget: 12,000 ADA
• Contributor: Piyush , Aayush & 1 Elixir dev

Milestone 3: TxBuilder 1 (Spend, Mint, Withdraw)

• Budget: 22,000 ADA
• Contributor: Piyush & Aayush

Milestone 4: TxBuilder 2 (Publish, Vote, pupose)

• Budget: 36,000 ADA
• Contributor: Piyush, Aayush & 1 Elixir Dev

Milestone 5: Phoenix Liveview Integration & close out report

• Budget: 4,800 ADA
• Contributor: Aayush

[Final Pitch] Value for Money

How does the cost of the project represent value for the Cardano ecosystem?

The introduction of an Elixir-based SDK will attract 50,000+ developers from other ecosystems who are familiar with Elixir, broadening the talent pool and leading to innovative projects that contribute to the Cardano ecosystem's growth.

At 90,800 ADA, Sutra SDK costs less than most projects spend on a single custom integration, yet delivers infrastructure that serves the entire Elixir community permanently - representing extraordinary value concentration for ecosystem investment.

[Required Acknowledgements] Consent & Confirmation

Terms and Conditions:

Yes