Uphold currency rate bot for interview

Requirements

• Node.js >= v20
• Docker and Docker Compose (optionally, Podman and Podman compose)
• PostgreSQL (if running outside of Docker)

Quick Start

1. Install Dependencies

npm install

2. Run the Bot

With default parameters, no DB or API:

node index.js

or

npm start

With custom parameters:

node index.js --pairs BTC-USD,ETH-USD --interval 10000 --threshold 0.05

or

npm start -- --pairs BTC-USD,ETH-USD --interval 10000 --threshold 0.01

With environment file:

node --env-file=.env.example index.js

3. Run with Docker/Podman Compose (includes DB and API)

cp .env.example .env

Edit .env with your settings:

POSTGRES_USER=uphold
POSTGRES_PASSWORD=uphold
POSTGRES_DB=uphold_db
PAIRS=BTC-USD,ETH-USD
INTERVAL=5000
THRESHOLD=0.01

# Start services
docker compose up -d --build 

or

podman compose up -d --build

View logs

docker compose logs -f uphold_bot_1

or

podman compose logs -f uphold_bot_1

Configuration

Parameter	Flag	Environment	Default	Description
Pairs	-p, --pairs	PAIRS	BTC-USD	Comma-separated currency pairs
Interval	-i, --interval	INTERVAL	5000	Uphold API retrieval interval in milliseconds
Threshold	-t, --threshold	THRESHOLD	0.01	Alert difference percentage

Running Tests

npm test

API

Endpoints

Health Check

curl http://localhost:3000/health

Statistics

curl http://localhost:3000/stats

Alerts

# Get last 50 alerts (default)
curl http://localhost:3000/alerts

# Get last 100 alerts
curl http://localhost:3000/alerts?limit=100

Example Output

[18:44:51.898] INFO: Bot starting...
[18:44:51.898] INFO: [WATCHING] BTC-USD | Every 5000ms | Threshold 0.01%
[18:44:51.898] WARN: [DB] specificiation missing. Running in memor
[18:44:52.167] INFO: [BTC-USD] Monitoring every 5000ms, +/-0.01%
[18:44:52.367] INFO: [BTC-USD] Initial price: 90977.65
[18:45:07.879] INFO: [ALERT] BTC-USD DOWN -0.0116%
    pair: "BTC-USD"
    direction: "DOWN"
    change: "-0.0116%"
    prev: "90977.648894"
    curr: "90967.085674"

Architecture

• index.js - Entry point
• src/bot.js - Bot logic
• src/api.js - Uphold API client
• src/db.js - DB logic
• src/logger.js - Simple logging
• src/server.js - API server for docker diagnosis
• src/stats.js - Statistics tracking
• tests/bot.test.js - Tests

Stopping the Bot

Press Ctrl+C or send SIGTERM for graceful shutdown.

With Docker:

docker compose down

or Podman

podman compose down
podman volume rm uphold_pgdata