How Acubic Works With eToro

Connecting an investment tool to a brokerage account is a different decision from trying one out. Before you grant any software access to an account that holds real money, you should be able to answer four questions precisely: what it can see, what it can do, what it can never do, and how you take the access back. This article answers those four for an eToro connection, in the order they actually matter.

Acubic is an approved third-party application listed in the eToro App Store, and it connects through eToro's official API. It is operated independently: Acubic is not owned by or part of eToro, and eToro does not endorse or take responsibility for the portfolios Acubic produces. That distinction matters more than it might seem, because it tells you exactly whose rules govern each half of the arrangement. eToro controls the access you grant and can revoke it. Acubic controls what is done with that access, within the limits eToro sets.

What the connection actually is

The connection runs on OAuth, which is the same mechanism that lets you sign in to a third-party service using an existing account elsewhere. In practice this means you are never asked for your eToro password on an Acubic screen. You are handed to eToro's own login page, you authenticate there, and eToro issues Acubic a scoped access token. Your credentials do not pass through Acubic at any point.

Stored broker credentials are encrypted at rest. They are never returned to the browser and never written to logs. The token is revocable from inside eToro at any time, independently of anything you do in Acubic, which means the ultimate off switch is not one this application controls.

One connection is bound to one strategy. Two strategies cannot both manage the same account and fight over the same positions, which is a structural guarantee rather than a policy: the binding is enforced at the database level. If you want a different strategy running against that account, you change the strategy on that connection or use a separate account.

Connecting your account, step by step

There are five steps, and the order is not arbitrary.

Build a strategy first. The connection attaches to a saved strategy, so one has to exist before there is anything to attach. You answer a set of risk questions, and Acubic generates a target portfolio and its backtest. Nothing touches a broker at this stage. You can stop here permanently and use the tool as an analysis surface, which is a legitimate way to use it.

From that strategy, you choose to connect a broker and pick eToro. Acubic hands you off to eToro's login page, where you authenticate and approve the access. You then set how much of the account Acubic manages and how often it rebalances: monthly, quarterly, or annually. Finally, you approve the first rebalance. Acubic compares your live positions against the target weights and prepares the smallest set of orders that closes the gap, and nothing executes until you approve it.

The reason the capital figure is a separate step is that it defines the managed set. Positions outside that set are left alone. An eToro account is not required to be dedicated to Acubic, and holdings you want to keep independent stay independent.

What happens on a rebalance day

A rebalance is not a liquidate-and-rebuild. That is the single most common misconception about automated portfolio tools, and it is worth being precise about, because the difference is real money in trading costs.

Acubic reads your live positions, compares them against the target weights of the strategy attached to that connection, and trades only the difference. A position already at its target weight is not touched. The output is the smallest set of orders that closes the gap between where the portfolio is and where the strategy says it should be. If nothing has drifted, nothing trades.

This is the mechanical expression of a distinction worth understanding properly: optimization and rebalancing are different jobs. Optimization chooses the target. Rebalancing defends it. Neither substitutes for the other, and a tool that only does the first leaves you with a portfolio that decays from the day it is built. If you want the design reasoning behind the trigger and the trade construction, how a rebalancing model is designed covers it in depth.

How much it does on its own

This is where eToro connections have a specific constraint that is easy to get wrong, so read it carefully.

A standard eToro connection runs on one-click approval, and that is the only mode it runs in. Each scheduled rebalance prepares the order set and stops. You review the trades and approve them, and nothing is sent to eToro until you do. While an approval is pending, nothing else is sent either.

You can also leave rebalancing switched off entirely. In monitoring mode, Acubic tracks the account's live positions, its drift from target, and its performance, without ever placing an order.

Unattended rebalancing, where scheduled rebalances execute without a per-order prompt, is available only on an eToro mirrored account. That is a ring-fenced sub-account you fund separately from your main balance. Connecting your main eToro account never enables unattended trading, and no setting inside Acubic can turn it on for a main-account connection. If you read a description of this product that suggests otherwise, it is wrong.

The asymmetry is worth naming because it differs by broker. A Trading 212 connection can run unattended directly on the main Invest account, because a Trading 212 API key is scoped to the whole account with no isolated sub-account available. Same software, different broker architecture, different answer.

What Acubic will never do

Some limits are worth stating as flatly as the capabilities.

• It does not move money. Acubic reads positions and places equity orders through the connection. There is no withdrawal or transfer function anywhere in the product, and money never leaves your eToro account for anywhere else.
• It does not touch positions outside the managed set you defined.
• It does not predict short-term price moves, and no part of the construction method depends on doing so. The methodology sets out what the model does and the limitations it publishes.
• Disconnecting does not liquidate. If you disconnect in Acubic, or revoke the token inside eToro, every existing position stays exactly where it is. Acubic simply stops sending rebalance orders.

That last one is the most important and the least intuitive. Disconnecting an automation tool from a brokerage account should never be an event that costs you money, and here it is not one. The exit is free.

When an order fails

Brokers reject orders. An instrument becomes unavailable, a market is closed, a size falls below a minimum. A tool that hides this is a tool you cannot audit.

When eToro rejects an order, the failure is recorded against that rebalance run with the broker's own stated reason, and the remaining orders are handled independently rather than the whole run being silently abandoned. You can review what filled, what did not, and why, in the connection's execution history. Every order Acubic places is recorded in an audit log you can read after the fact, including the rejections.

This matters for a reason beyond tidiness. An automated system acting on your account is only trustworthy to the extent its actions are reconstructable afterwards. A log that records only successes is not a log.

Does it work outside the US?

Yes. eToro operates globally, and the allocation and backtest engine is jurisdiction-agnostic: the construction method does not change based on where you are. What does change is tax treatment and which instruments are available to you, both of which depend on your eToro region rather than on Acubic.

Deciding whether to connect at all

Connecting is optional, and it is worth being honest about who should not bother.

If you want stock tips, short-term calls, or a system that promises to time the market, this is the wrong tool and no configuration of it will become the right one. If you want someone to take discretionary control of your money and make judgment calls on your behalf, that is a regulated advisory relationship and this is not one.

The connection earns its place when you have a target allocation you believe in and the honest problem is maintenance: the portfolio drifts, the corrective trade is tedious to construct across a dozen positions, and it is hardest to place at exactly the moment it matters most. That is a process problem, and it is the one this solves. You keep custody at your own broker, you keep the approval step, and the construction method is published rather than proprietary.

If you are still working out what the product does before deciding how it connects, how Acubic works covers the build side, and the plan comparison sets out what each tier includes, including the free one. When you are ready to look at the connection itself, the eToro integration page has the setup walkthrough and the full question list.