Stacks Transaction Sponsor

This is a service to sponsor Stacks transactions on users' behalf.

Overview

The service provides an API /execute that accepts a serialized sponsored Stacks transaction hex string. It will verify the transaction, and submit it to the Stacks blockchain using one of the sponsor accounts configured.

The service tracks the status of all pending and submitted transactions in a PostgreSQL database, and handles re-submitting transactions using replace-by-fee (RBF) if they are not settled after certain blocks.

Services

• src/main.ts - Starts up the Express server, worker process and health/status check endpoints
• src/execute.ts - Handles /execute API requests
• src/submit-transactions.ts - Submits pending transactions from DB
• src/sync-transactions.ts - Syncs status of submitted transactions
• src/rbf-transactions.ts - Replaces submitted transactions using RBF if needed
• src/worker.ts - Background worker that runs the sync and RBF transactions process

Configuration

The service is configured via environment variables:

• STACKS_API_URL - Stacks API endpoint
• STACKS_NETWORK_TYPE - Either mainnet or mocknet
• SPONSOR_ACCOUNT_ADDRESS - Sponsor account address
• SPONSOR_ACCOUNT_SECRETKEY - Sponsor account secret key
• POSTGRES_* - PostgreSQL connection config

Database Models

The user_operations table tracks pending and submitted user transactions.

The sponsor_records table tracks info about all sponsored transactions submitted.

Requirements

• Node.js
• PostgreSQL

Running Locally

Configure environment variables: cp .env.example .env

Start service: npm run dev