ChainCall

A multi-chain smart contract interaction tool for blockchain program introspection, IDL parsing, transaction building, and simulation. Currently supports Solana with an extensible architecture for additional chains.

🚀 Try it live

CA: BtcuWYrpxC1fxNwsEaMisFUXqhoSsRgAZU7HtpbxhnBm

Features

• Anchor Auto-Magician: Automatically fetch Anchor IDL for Solana programs and generate a UI for interacting with program methods
• Instruction Builder: Manually pack bytes for raw instructions using supported data types
• Transaction Simulator: Dry-run transactions against the current network state and view execution logs
• Multi-Chain Ready: Extensible architecture designed to support Ethereum, Sui, Aptos, and NEAR in the future

Tech Stack

Backend

• FastAPI - Python async API framework
• Solana/Solders - Solana blockchain interaction
• AnchorPy - Anchor IDL parsing and instruction building
• Pydantic - Data validation and serialization

Frontend

• React 19 - UI framework
• TypeScript - Type-safe development
• Vite - Build tool and dev server
• TailwindCSS - Styling
• Radix UI - Accessible component primitives
• Framer Motion - Animations
• TanStack Query - Data fetching and caching

Project Structure

ChainCall/
├── Backend/
│   ├── backend/
│   │   └── app/
│   │       ├── chains/           # Chain implementations
│   │       │   ├── base/         # Base interfaces for all chains
│   │       │   ├── solana/       # Solana-specific implementation
│   │       │   └── registry.py   # Chain registry for multi-chain support
│   │       ├── models/
│   │       │   └── schemas.py    # Pydantic models
│   │       ├── routers/
│   │       │   └── solana/       # Solana API endpoints
│   │       └── main.py           # FastAPI application
│   └── pyproject.toml            # Python dependencies
└── Frontend/
    ├── client/
    │   └── src/
    │       ├── components/       # UI components
    │       ├── pages/            # Application pages
    │       └── lib/              # Utilities and helpers
    ├── server/                   # Express server
    └── package.json              # Node dependencies

API Endpoints

Info

• GET / - Root endpoint with available endpoints info
• GET /health - Health check
• GET /chains - List supported chains

Solana IDL

• GET /solana/idl/{program_id} - Fetch Anchor IDL for a program
• GET /solana/idl/{program_id}/methods - Get instruction methods from IDL

Solana Instructions

• POST /solana/instruction/pack - Pack instruction data using byte layout
• GET /solana/instruction/types - Get supported data types

Solana Transactions

• POST /solana/tx/build - Build an unsigned transaction
• POST /solana/tx/simulate - Simulate a transaction

Solana Accounts

• POST /solana/accounts/info - Get account information

Supported Data Types

For instruction packing:

• Unsigned integers: u8, u16, u32, u64, u128
• Signed integers: i8, i16, i32, i64, i128
• Other: bool, pubkey, string, bytes

Getting Started

🔗 Live Demo: https://chain-call.vercel.app

🧪 Test Contract Address: BtcuWYrpxC1fxNwsEaMisFUXqhoSsRgAZU7HtpbxhnBm

Backend Setup

cd Backend

# Using pip
pip install -r backend/requirements.txt

# Or using uv (recommended)
uv sync

# Run the backend
uvicorn backend.app.main:app --reload --port 8000

Frontend Setup

cd Frontend
npm install

# Development
npm run dev

# Production build
npm run build
npm start

API Documentation

When the backend is running, interactive API documentation is available at:

• Swagger UI: http://localhost:8000/docs
• ReDoc: http://localhost:8000/redoc

Future Roadmap

• Ethereum/EVM chain implementation
• Sui chain implementation
• Aptos chain implementation
• NEAR chain implementation
• Batch transaction building
• Rate limiting and caching
• Additional data type support (vec, struct)

License

MIT