Alpaca's Claude Connectors Simulate Trades, Never Execute Them

Alpaca launched two connectors for Anthropic's Claude on November 12, 2026, and neither one can place a live trade. The Paper Trading connector can submit simulated orders in stocks, ETFs and options; the Live connector can monitor a real account but cannot send orders to market at all. Live execution still has to run through Alpaca's Trading API or Dashboard.

The pair extends Alpaca's existing agentic tooling, which already includes an MCP server, a command-line interface and other AI connectors. The Paper Trading connector links a paper account through the company's Trading API and Market Data API, supporting market analysis, account monitoring and simulated trades. Its listing in Anthropic's Claude directory also includes crypto. The Live connector handles portfolio monitoring and market research on a live account, and it can create or change watchlists.

What can Claude actually do?

Both connectors can report balances, positions and account activity, and analyze market trends. The Live connector's directory listing offers prompts to summarize balances, buying power, open positions and portfolio concentration. It can also identify which positions drove equity changes over the past 30 days, retrieve real-time quotes and pull historical market data.

The order permissions are where the two diverge sharply. Only Paper Trading can submit orders, and only simulated ones. Neither connector can execute live trades — a deliberate boundary that keeps Claude as an analysis and simulation layer rather than a trading venue.

Both directory pages label the integrations as community connectors. Their notices say the connectors receive automated checks but are not verified by Anthropic, which does not control how their tools work or change.

Account checks and order status

Connecting either service requires an Alpaca sign-in and authorization flow. Alpaca instructs users to review the requested permissions and confirm the intended account before authorizing access. For paper trading, Claude's account response should be compared with the paper account in Alpaca's dashboard.

Users with multiple paper accounts need to confirm which one is connected. Any account or balance mismatch should be resolved before proceeding, and an order should not be used to test an unresolved mismatch, Alpaca says.

An order acknowledgment does not establish a fill. The order may remain open, fill partially or be rejected, so the returned status and any rejection message need inspection. A conversational confirmation is not proof that a position changed. Alpaca instructs users to review AI-generated order details before submission and independently verify order statuses, balances and positions, noting that responses can contain errors, omissions or inaccuracies.

What does paper trading actually prove?

Paper trading uses simulated funds rather than real capital. Alpaca's documentation describes a real-time environment that is free and available to all users, with orders following the live-trading workflow except that they are not routed to a live exchange. Fills are simulated from real-time quotes.

The simulation has hard limits. It does not account for:

• market impact
• order-information leakage
• latency-related slippage
• queue position for non-marketable limit orders
• price improvement
• regulatory fees or dividends

A completed paper order demonstrates the simulated workflow. It does not predict a live fill or establish how a strategy would perform with real money.

Market-data access depends on the subscription

Market-data access is a separate check from account access and order execution. What Claude can retrieve depends on the authenticated account's subscription, permissions and enabled asset classes. A successful balance request does not establish access to every symbol, feed or asset class. Options data appears only for accounts with that asset class enabled, and reconnecting alone may not resolve a missing permission or unsupported tool.

The free Basic plan is the default for paper and live Trading API accounts, but its real-time coverage is limited to IEX for equities and an indicative feed for options. Algo Trader Plus provides real-time equities coverage across all US stock exchanges and the OPRA options feed. Basic also excludes the latest 15 minutes of historical equities and options data and permits 200 historical API calls per minute. Algo Trader Plus removes that time restriction and raises the ceiling to 10,000 calls per minute.

For developers and traders bringing these workflows into Claude, the practical capability is defined by more than the conversational interface. Account permissions, simulation assumptions and data subscriptions determine which analyses and order tests the connectors can support, while Alpaca remains the venue for live execution and independent verification.