📌 Stellar Stock Price Oracle

An open-source off-chain oracle system that provides real-world stock price data to the Stellar network in a secure, modular, SEP-compliant way.

🎯 What this Project Does

This project fetches stock prices from multiple external financial APIs, normalizes and aggregates them, cryptographically signs the results, exposes them via a backend API, and supports on-chain submission to a Stellar oracle contract, so smart contracts can depend on real stock prices.

The goal is to make this reliable, testable, and extensible, with each part implemented as a separate app or package in this monorepo.

🏗️ High-Level Architecture

The system consists of the following stages:

1. Ingestor - Connects to external stock price APIs
2. Aggregator - Normalizes, filters, and aggregates data
3. Signer - Produces signed proofs of aggregated prices
4. API Publisher - Exposes a REST/WebSocket endpoint
5. Transactor - Submits signed data on-chain
6. Smart Contracts - SEP-compliant Oracle on Stellar
7. Frontend Demo - UI for visualizing feeds

Data flows from raw external sources → ingestor → aggregator → signer → API → on-chain oracle.

🗂️ Monorepo Layout

/oracle-stocks-monorepo
├── apps/
│   ├── ingestor/        # Connects to external stock price APIs
│   ├── aggregator/      # Normalizes, filters, and aggregates data
│   ├── api/             # REST/WebSocket API endpoint
│   ├── transactor/      # Submits signed data on-chain
│   ├── frontend/        # UI for visualizing feeds
│   └── smart-contracts/ # SEP-compliant Oracle on Stellar
├── packages/
│   ├── shared/          # Shared utilities, types, and constants
│   └── signer/          # Cryptographic signing of price data
├── tests/               # Integration and E2E tests
├── docs/                # Documentation
├── infra/               # Infrastructure as code
├── .github/             # GitHub workflows and templates
├── turbo.json           # Turborepo configuration
└── README.md

📌 How We Work

Each app will be developed one by one using issue prompts that include:

• Context and goals
• Expected inputs and outputs
• Tech stack and conventions
• Acceptance criteria
• Minimal scaffolding (just enough to get started)

We will not build everything at once — each issue will introduce the next piece.

🧑‍💻 Contributions

Contributors should:

1. Read the contextual issue
2. Understand how their module fits into the architecture
3. Implement the minimum viable feature first
4. Add tests and documentation
5. Submit PRs with clear description

🚀 Getting Started

Prerequisites

• Node.js >= 18
• npm >= 9

Installation

npm install

Development

# Run all apps in development mode
npm run dev

# Run a specific app
npm run dev --filter=@oracle-stocks/ingestor

# Build all apps and packages
npm run build

# Lint all code
npm run lint

# Type check
npm run check-types

📚 Documentation

See the docs/ directory for detailed documentation.

🧪 Testing

Integration and end-to-end tests are located in the tests/ directory.

# Run all tests
npm test

# Run tests for a specific package
npm test --filter=@oracle-stocks/shared

🏥 CI / Repo Health

Before pushing, verify that the full CI pipeline passes locally:

npm ci && npm run lint && npm run check-types && npm run build && npm test

Command	What it does
npm run lint	Runs ESLint across all workspaces via Turborepo
npm run check-types	Runs tsc --noEmit in all TypeScript workspaces
npm run build	Builds all apps and packages via Turborepo
npm test	Runs Jest tests in all workspaces

CI runs these same steps automatically on every push and PR to main and develop.

📄 License

MIT License