Best Apps to Connect a Brokerage to an AI Assistant

Last updated July 2026

Short answer

A handful of apps and services link a real brokerage account to an AI assistant, and they are not interchangeable. SnapTrade and Plaid are the regulated aggregators that make the connection (SnapTrade can read and trade; Plaid reads investments only). Walnut, PortfolioPilot, and Magnifi are consumer assistants that turn that link into a conversation about your portfolio. Alpaca, Interactive Brokers, and Robinhood are brokers you can connect directly (Alpaca and IBKR read and trade for developers; Robinhood is read-only for outside apps). There is no single best one: pick by your broker and whether you want the assistant to just read, or to read and trade.

“Connect my brokerage to an AI assistant” sounds like one thing, but three different kinds of app do the work. Aggregators (SnapTrade, Plaid) are the connection layer that links your account without handling your broker password. Consumer assistants (Walnut, PortfolioPilot, Magnifi) sit on top of that link and give you a chat interface over your portfolio. And some brokers (Alpaca, Interactive Brokers, Robinhood) expose their own accounts to an agent directly. The most common mistake is expecting a read-only aggregator to place trades, or a single-broker developer tool to reach every account you hold. This guide describes each on the same fields, groups them by what you actually want to do, and is honest about where Walnut is and is not the right fit.

How an app links your brokerage to an AI assistant

Under the hood, connecting a brokerage to an assistant like Claude or ChatGPT has three moving parts: the AI client you chat in, the app that exposes your account as tools, and the broker connection that app authenticates against. That last part happens one of two ways. Most consumer apps reach your account through a regulated account-aggregation layer such as SnapTrade or Plaid, which fronts many institutions behind one connection, so your broker login and password stay at the broker and the app gets scoped access. Developer tools connect directly to a single broker's own API (Alpaca, Interactive Brokers) with an API key you control. For the plain-language walkthrough, see how to connect your brokerage to an AI assistant.

The aggregator route is why a single app can reach brokers like Schwab and Fidelity without a bespoke integration for each. Many of these apps speak the Model Context Protocol, an open standard introduced by Anthropic in late 2024 for connecting assistants to external tools, so the assistant can call “get positions” or “place order” during a conversation. If you want the app to be a portfolio-aware MCP link specifically, see the best MCP connectors for brokerages.

The key split is what the connection can do. A read-and-trade path (SnapTrade on supported brokers, Alpaca, IBKR connectors) can both report your account and submit orders. A read-only path (Plaid, Robinhood through aggregators) can analyze your portfolio but never act on it. Getting that distinction right up front saves the most common disappointment.

What to look for when picking an app

Your broker. Whether it supports the account you actually hold. Aggregator-based apps (like Walnut) reach many US brokers; single-broker tools (Alpaca) bind to one.
Read vs trade. Whether the app only reads holdings or can also place trades, and what approval step gates an order before it reaches the broker.
Which AI client. Whether you can use it from Claude Desktop, ChatGPT, or Cursor, or only inside the app's own chat.
Security model. Whether it links through a regulated aggregator, never stores your broker password, and defaults to read-only.
No-code vs build. A hosted consumer app you connect in a few clicks, versus a developer integration you self-host and secure.
Advice vs execution. Whether you want a holistic second opinion (PortfolioPilot) or the ability to act in the broker you already have (Walnut).

The connection layers: aggregators

These are the regulated services that actually link your account. They are usually the plumbing under a consumer app rather than something you use directly, but they define what the app on top can do. Each is described on the same fields: what it is, how the connection works, whether it reads or trades, who it suits, and one honest limitation.

SnapTrade

A regulated brokerage-connectivity API that links a user's account to a third-party app. Developers use it to read positions, balances, and order history, and to place trades, across many US brokers behind one connection. It is the plumbing under several consumer apps rather than an app you use directly.

How it connects: Aggregator: your broker login stays at the broker, and the app you use gets scoped access through SnapTrade.
Read or trade: Read on most supported brokers; trade execution on a subset (for example Alpaca, Public, Schwab, Tradier, Webull).
Best for: Builders who need one integration to reach many US brokers with real read and trade access, without a bespoke link per broker.
One honest limitation: It is developer infrastructure, not a finished assistant: on its own it does not talk to an AI client until an app sits on top of it. Some brokers, like Robinhood, connect read-only.

Plaid

A widely used financial-data aggregator that links bank and brokerage accounts to apps. Its investments product reads holdings, transactions, and balances from many institutions, so an app can see a portfolio without handling broker passwords.

How it connects: Aggregator: read-only account linking through Plaid's connection flow; credentials stay at the institution.
Read or trade: Read only for investments (holdings and transactions); it does not place brokerage trades.
Best for: Apps that only need to read a portfolio for analysis or aggregation and want broad institution coverage.
One honest limitation: Read-only for investments, so an assistant built on Plaid alone can analyze but never trade, and like any aggregator it depends on each institution's support.

The assistant apps: talk to your portfolio

These sit on top of a connection layer and give you an AI conversation over your holdings. This is a fast-moving space, so verify current broker support and features before relying on any of them. Same field block as above.

Walnut

A portfolio-aware AI investing assistant that connects a real broker once through a secure connection, so your broker login stays at the broker, then lets you read your live portfolio and place basket trades from Claude Desktop, ChatGPT, or Cursor. It offers a hosted connector and a small downloadable local MCP shim, so there is no server code to write.

How it connects: Aggregator: connects your brokerage securely, so your broker login and credentials stay at the broker.
Read or trade: Read by default; trades only with your explicit approval, and only where the broker supports execution.
Best for: People who want broad US-broker coverage and a no-code way to talk to their own portfolio through Claude or ChatGPT rather than self-hosting anything.
One honest limitation: It sits on top of your broker rather than being one, so you need an existing account, and broker feeds rarely pass cost basis (returns are framed as window returns, not realized profit and loss). Walnut is not an investment adviser.

PortfolioPilot

An AI-driven portfolio management and advice service that links your investment and retirement accounts to give a whole-portfolio assessment, risk analysis, and suggested actions. It also publishes an MCP server so an assistant can reach its analysis tools.

How it connects: Aggregator-based account linking to read holdings across accounts; analysis and guidance layer on top.
Read or trade: Read and analyze; it guides allocation rather than acting as your order-execution broker.
Best for: People who want an AI second opinion and ongoing monitoring across many accounts, not just one brokerage.
One honest limitation: It centers on holistic advice and monitoring rather than one-click execution in your broker, and deeper features sit behind a paid tier.

Magnifi

An AI investing assistant and marketplace you can chat with about investments. You can link outside brokerage accounts to get portfolio-aware answers, and it also offers its own brokerage account for placing trades.

How it connects: Links external brokerage accounts to read holdings; also offers its own in-app brokerage for trades.
Read or trade: Read linked accounts for context; trade through Magnifi's own brokerage account.
Best for: People who want a conversational assistant plus an in-app place to trade, and are open to opening a Magnifi account.
One honest limitation: Trade execution runs through Magnifi's own brokerage rather than the outside broker you linked, and full features are subscription-based.

The brokers you can connect directly

If you hold one specific broker and want an agent to read and trade that account, you can often connect to it directly rather than through a consumer assistant. These are more developer-facing but give the deepest control.

Alpaca

An API-first brokerage built for developers and automation. It publishes an official, open-source MCP server that exposes market data, account and position reads, order placement, and a full paper-trading sandbox to an AI agent.

How it connects: Broker API: you supply your own Alpaca API key and secret and self-host the connection; credentials stay in your config.
Read or trade: Read + trade + paper trading, all on Alpaca accounts.
Best for: Developers building agent-driven, automated workflows who already use (or will open) an Alpaca account.
One honest limitation: Single-broker by design: it only touches Alpaca accounts, and you run and secure the connection yourself.

Interactive Brokers

A large global broker with a full trading API. It has no official AI-assistant app, but community-built MCP connectors wrap the IBKR Client Portal or gateway so an agent can read accounts, pull data, and place orders.

How it connects: Broker API: authenticate through IBKR's own gateway or Client Portal session; the connector talks to that local session.
Read or trade: Read + trade (paper and live, depending on the connector).
Best for: Advanced and international IBKR users comfortable running their own gateway and vetting community code.
One honest limitation: The AI link is community-built and unofficial, so quality and maintenance vary, and you must run the IBKR gateway alongside it.

Robinhood

A popular commission-free broker. Through aggregators like SnapTrade, an app can read a Robinhood account so an assistant sees your holdings, and Robinhood has begun shipping its own agentic tooling separately.

How it connects: Aggregator read-only through SnapTrade for third-party apps; no public trading API for outside apps today.
Read or trade: Read only through aggregators (no third-party live trading).
Best for: Robinhood holders who want an assistant to see and analyze their positions for context, even if it cannot place orders there.
One honest limitation: Read-only for outside apps: an assistant can analyze a Robinhood account but cannot trade it through an aggregator. Verify current support before relying on it.

Apps to connect a brokerage to an AI assistant, at a glance

App	Type	Connection	Read / trade	Best for
SnapTrade	Connection layer	Aggregator link	Read on most supported brokers; trade execution on a subset (for example Alpaca, Public, Schwab, Tradier, Webull)	Builders who need one integration to reach many US brokers with real read and trade access, without a bespoke link per broker
Plaid	Connection layer	Aggregator link	Read only for investments (holdings and transactions); it does not place brokerage trades	Apps that only need to read a portfolio for analysis or aggregation and want broad institution coverage
Walnut	AI assistant app	Aggregator link	Read by default; trades only with your explicit approval, and only where the broker supports execution	People who want broad US-broker coverage and a no-code way to talk to their own portfolio through Claude or ChatGPT rather than self-hosting anything
PortfolioPilot	AI assistant app	Aggregator link	Read and analyze; it guides allocation rather than acting as your order-execution broker	People who want an AI second opinion and ongoing monitoring across many accounts, not just one brokerage
Magnifi	AI assistant app	Broker API	Read linked accounts for context; trade through Magnifi's own brokerage account	People who want a conversational assistant plus an in-app place to trade, and are open to opening a Magnifi account
Alpaca	Broker + agent link	Broker API	Read + trade + paper trading, all on Alpaca accounts	Developers building agent-driven, automated workflows who already use (or will open) an Alpaca account
Interactive Brokers	Broker + agent link	Broker API	Read + trade (paper and live, depending on the connector)	Advanced and international IBKR users comfortable running their own gateway and vetting community code
Robinhood	Broker + agent link	Aggregator link	Read only through aggregators (no third-party live trading)	Robinhood holders who want an assistant to see and analyze their positions for context, even if it cannot place orders there

Ranked by what you want to do

There is no overall number one, because the right app depends on whether you want to talk to the broker you already have, only read a portfolio for analysis, or trade a single broker directly. Below the field is ranked inside each use-case, with the stronger fit first. Walnut appears in the assistant group as the no-code, broad-coverage pick, not as an overall winner.

Best for a no-code AI assistant over your own portfolio

If you want to link the broker you already have and then talk to that portfolio through an AI assistant, without writing code, these are the shortlist. The right one depends on how holistic you want the advice and whether you want execution.

PortfolioPilot. The most holistic AI-advice layer: links many accounts and gives a whole-portfolio assessment with suggested actions, if a second opinion matters more than in-broker execution.
Magnifi. A conversational assistant paired with an in-app brokerage, if you are happy trading inside Magnifi rather than your linked broker.
Walnut. The no-code option that connects most US brokers securely and works from Claude or ChatGPT, read-only by default with trades you approve. It leads this niche (talk to the broker you already have), not the whole field.

Best for the underlying connection (developers and aggregation)

If you are building the link yourself, or only need to read a portfolio into an app, these are the connection layers that reach real accounts.

SnapTrade. Reads and, on supported brokers, trades many US accounts behind one integration, the plumbing that lets an app act on a real portfolio.
Plaid. Broad read-only investment aggregation across many institutions when the app only needs to see holdings, not trade.
Alpaca. An API-first broker with an official MCP server and paper trading when you want to build agent workflows against your own account.

Best if you want to trade a single broker directly

If you hold one specific broker and want an agent that reads and trades that account, connect to it directly rather than through a consumer assistant.

Alpaca. The deepest official agent surface (data, paper, and live execution) for accounts held at Alpaca.
Interactive Brokers. Community connectors read and trade IBKR's broad global markets for users willing to run their own gateway.
Robinhood. Read-only through aggregators for now, so an assistant can see a Robinhood account for context even though it cannot trade it.

How we evaluated these

We split the field into the connection layer (aggregators), the consumer assistants built on top of it, and the brokers you can connect directly, because comparing them on one axis is misleading. Within each group we weighed broker coverage, whether the app can execute or only read, the security and auth model, which AI clients it works with, and setup effort. We treat read-only defaults and credential safety as table stakes, not bonus features: an app that can trade but mishandles access is not better than a careful read-only one. We did not crown a single overall winner; the right app depends on your broker and what you want the assistant to do. Facts here are qualitative and point-in-time, so verify current capabilities and pricing on each provider's site.

Is it safe to connect a brokerage to an AI assistant?

It can be, if the access model is sound. The safer apps share three traits. First, they link through a regulated aggregator (SnapTrade, Plaid) rather than asking for your broker password, so your login stays at the broker. Second, read access is the default and any trade is gated behind explicit approval. Third, you can scope what the app may do, so a read-only connection cannot place orders even if the model asks. The Model Context Protocol many of these use was designed by Anthropic for exactly this kind of scoped, permissioned access.

The risks worth naming: a broad or mis-scoped connection can grant more than you intend; a self-hosted developer integration you do not secure becomes a new attack surface; and community-built broker connectors vary in maintenance, so vet the code before pointing one at a live account. Walnut follows the safe pattern: your broker login and credentials stay at your broker, access is read-only unless you enable trading, and every order requires your confirmation.

Which app should you use?

The quickest way to narrow it down is to match the app to what you actually want the assistant to do.

You want to talk to the broker you already have, no code. Walnut connects most US brokers securely and works from Claude or ChatGPT, read-only by default with trades you approve.
You want a holistic AI second opinion across many accounts. PortfolioPilot links your investment and retirement accounts and gives a whole-portfolio assessment.
You want a chat assistant with in-app trading. Magnifi pairs a conversational assistant with its own brokerage account.
You are building the link yourself. SnapTrade (read and trade) or Plaid (read-only investments) are the aggregator layers; Alpaca is an API-first broker with an official MCP server.
You hold one broker and want full agent control. Connect Alpaca or Interactive Brokers directly and self-host it.
You hold Robinhood. An assistant can read it through an aggregator for context, but cannot trade it through an outside app today.

Where Walnut fits

To be upfront, since this is our site: Walnut is the AI investing assistant that talks to the broker you already have and places the trades you approve. Among the apps that link a brokerage to an AI assistant, it is the portfolio-aware, read-only-by-default consumer option, rather than a raw developer integration or an aggregator you build on, and it leads in that niche rather than overall. Walnut connects a real broker once through a secure connection, so your broker login stays with your broker, then lets Claude Desktop, ChatGPT, or Cursor read your live portfolio and place basket trades you approve. You can use either its hosted connector or a small downloadable local MCP shim, whichever your AI client supports, with no server to run. Your broker login stays at the broker, access is read-only by default, and every trade requires your approval. Because broker feeds rarely pass cost basis, Walnut frames returns as window returns rather than realized profit and loss, and says so.

If you want a holistic advice layer across many accounts, PortfolioPilot fits better; if you want in-app trading inside one assistant, Magnifi does; and if you are a developer who lives in Alpaca or IBKR and wants full execution control, connect those directly. From a connected account you can ask an assistant about a specific stock, ETF, or theme against your real holdings. To see which brokers can be reached this way, see which brokers have an AI assistant and the guide to the best AI investing app. Walnut is not an investment adviser.

The bottom line

Linking a brokerage to an AI assistant takes three kinds of app working together. Aggregators (SnapTrade for read and trade, Plaid for read-only investments) make the connection. Consumer assistants (Walnut, PortfolioPilot, Magnifi) turn that link into a conversation over your portfolio. And brokers (Alpaca, Interactive Brokers, Robinhood) can be connected directly, with Alpaca and IBKR reading and trading for developers and Robinhood read-only for outside apps. There is no single best one: pick by your broker, whether you want the assistant to read or also trade, and how much you want to build, and keep access read-only until you deliberately enable trading.

Try Walnut on top of your broker

Walnut connects most US brokers securely and lets you talk to your portfolio from Claude or ChatGPT, with no server to run. Read-only by default; you approve every trade.

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FAQ

What is the best fintech app to link a brokerage account with an AI assistant?

There is no single best one; it depends on your broker and what you want the assistant to do. To talk to the broker you already have with no code, Walnut connects most US brokers securely and works from Claude Desktop, ChatGPT, or Cursor, read-only by default with trades you approve. For a holistic AI second opinion across many accounts, PortfolioPilot is strong. For a chat assistant with in-app trading, Magnifi. If you are building the link yourself, SnapTrade (read and trade) and Plaid (read-only) are the connection layers, and Alpaca is an API-first broker with an official MCP server.

How do apps connect a brokerage account to an AI assistant?

Two ways. Most consumer apps use a regulated aggregator like SnapTrade or Plaid, which links your broker behind one connection so your login and password stay at the broker and the app gets scoped access. Developer tools connect directly to a single broker's API (Alpaca, Interactive Brokers) with your own API key. Either way, the app exposes your holdings to an assistant like Claude or ChatGPT so it can reason about your real portfolio.

Which apps can actually place trades, and which only read my portfolio?

SnapTrade can read and, on supported brokers, trade; Plaid reads investments only. Walnut is read-only by default and places trades you approve where the broker supports execution. Magnifi trades through its own in-app brokerage. Alpaca and community Interactive Brokers connectors read and trade those accounts. Robinhood connects read-only for outside apps. PortfolioPilot focuses on analysis and guidance rather than acting as your execution broker.

Is it safe to connect my brokerage to an AI assistant?

It can be if the access model is sound. The safer setups route the connection through a regulated aggregator (SnapTrade, Plaid) so your broker password is never shared, default to read-only, and require explicit approval before any trade. Before connecting, confirm whether the app can place orders and what approval controls exist. Walnut, for example, keeps your login at your broker, stays read-only unless you enable trading, and needs your confirmation for every order.

Can I connect Schwab or Fidelity to an AI assistant?

Yes, through an aggregator. Neither Schwab nor Fidelity publishes its own AI-assistant app, so the practical route is a service built on a regulated aggregator such as SnapTrade or Plaid. Walnut reaches both through its secure connection, so a Schwab or Fidelity account can be read from Claude or ChatGPT (Schwab also supports trade execution, while Fidelity connects read-only today). Single-broker developer tools like Alpaca do not touch Schwab or Fidelity.

What is the difference between SnapTrade and Plaid for this?

Both are regulated aggregators that link accounts without handling broker passwords, but their scope differs. SnapTrade is brokerage-focused and can both read and, on supported brokers, place trades, so an app built on it can act on your portfolio. Plaid's investments product is read-only: it aggregates holdings and transactions across many institutions but does not execute brokerage trades. An app that needs to trade tends to use SnapTrade; one that only analyzes can use either.

Do I need to be a developer to connect my brokerage to an AI assistant?

No. Consumer apps handle the connection for you: Walnut, PortfolioPilot, and Magnifi link your broker in-app with no code. The developer-facing options (SnapTrade and Plaid as connection layers, or Alpaca and Interactive Brokers directly) require building or self-hosting an integration. If you just want to talk to your portfolio, a hosted no-code app is the shortest path.

Can Claude or ChatGPT read and trade my brokerage through one of these apps?

Yes, if the app exposes your account to the assistant and you grant the right access. Walnut connects your brokerage securely and works from Claude Desktop or ChatGPT, read-only by default with trades you approve. Developer setups on Alpaca or Interactive Brokers can also let an agent read and trade. The safer pattern keeps access read-only by default and requires your explicit approval before any order reaches the broker.

Can I connect Robinhood to an AI assistant?

For reading, yes: aggregators like SnapTrade can link a Robinhood account read-only, so an assistant can see and analyze your positions. For live trading through an outside app, not today, because Robinhood has no public trading API for third parties (it has begun shipping its own agentic tooling separately). For execution through an app, brokers such as Alpaca, Public, Schwab, Tradier, and Webull are supported. Verify current support before relying on it.

Which app connects the most brokers to an AI assistant?

Apps built on an aggregator reach the widest set. Walnut connects most US brokers securely behind one link, and PortfolioPilot links many investment and retirement accounts for analysis. Single-broker tools like Alpaca or Interactive Brokers bind to one account by design. If you want one app across several brokers without writing code, the aggregator-based approach covers the most ground.

What does it cost to link a brokerage to an AI assistant?

It varies by app and changes over time, so check current pricing directly. Several consumer assistants offer a free tier for reading and analyzing a portfolio and reserve deeper features or execution for a paid plan. Developer connection layers price by usage or account volume. Because pricing moves, treat any figure you read elsewhere as point-in-time and confirm on the provider's site before signing up.

Should I use a consumer app or connect my broker's API directly?

Match it to your comfort with code. If you want to talk to the broker you already have with nothing to host, a consumer app like Walnut, PortfolioPilot, or Magnifi is the shortest path. If you write code and want full control over the tools your agent exposes, connect a broker API directly (Alpaca's official MCP server, or a community Interactive Brokers connector) and self-host it. Aggregators like SnapTrade and Plaid sit in between as the layer an app is built on.

Walnut is informational and is not an investment adviser. Apps, aggregators, broker support, security models, and pricing change quickly; verify current capabilities on each provider's site before connecting an account. Nothing on this page is a recommendation to buy, sell, or hold any security or to use any particular product.