Alpaca Paper Trading Bot: AI Signals in Your Alpaca Paper Account

Alpaca has become the go-to broker for algorithmic traders and trading bot developers, and for good reason. Built from the ground up as an API-first platform, Alpaca eliminates many of the friction points that plague automated trading on legacy brokers. The REST and WebSocket APIs are clean, well-documented, and designed for programmatic access rather than bolted on as an afterthought.

For automated trading, Alpaca supports every order type you need: market, limit, stop, stop-limit, and trailing stop orders. The WebSocket streaming API delivers real-time trade updates, order fills, and account events with minimal latency, which is critical for intraday strategies that need to react to fills immediately. Unlike many brokers that throttle API requests aggressively, Alpaca provides generous rate limits (200 requests per minute) that accommodate most algorithmic trading patterns without hitting walls.

One of Alpaca's strongest automation advantages is its paper trading environment. You can test your whole workflow — from signal generation through simulated fills and position management — against live market data without risking real capital. The paper API mirrors Alpaca's production API, so the order handling you test there matches the real endpoints. This makes Alpaca ideal for iterating on strategies and checking that a bot handles edge cases like partial fills, extended hours gaps, and market halts correctly.

Alpaca's fractional share support is a game-changer for automated portfolio management and small accounts. A bot can place precise dollar-amount orders rather than being limited to whole shares, which matters enormously for position sizing algorithms and accounts under $1,000. Combined with zero commissions, this means frequent trading is not weighed down by per-trade fees.

Alpaca supports options through its Trading API, subject to the account's approved options level, buying power, and supported strategies. In a connected Alpaca paper account, Paper Autopilot can paper trade stock, options, and crypto signals; the paper account's own permissions still apply. Alpaca's US-market focus means you need a different broker for futures or international equity strategies.

Tradewink connects to your Alpaca paper account using its paper API key and secret. Public subscriptions are paper-only; separately approved private beta accounts may submit live broker orders. Once connected, Paper Autopilot runs Tradewink signals in the paper account, while Tradewink syncs paper positions, monitors simulated fills via WebSocket, and applies its internal risk controls. For public-plan users, any real trade is your own decision, placed by you at Alpaca, outside Tradewink.

Tradewink also exposes the paper connection through its Model Context Protocol (MCP) server. With Claude Desktop, Cursor, VS Code, or any MCP-compatible client you can check your paper positions and run multi-agent research on a ticker — all secured by OAuth 2.1 with no API key pasted into the client.