MageLimits and guards
The caps and checks behind every card.
A card is not only a price. It is the result of a set of checks. Mage runs the checks before it draws the card. Mage runs them again after your "yes". If a check fails, Mage cancels and names the reason.
These guards are why you can trust the card. This page lists them, with the exact number and where it applies.
Every guard runs twice
The card comes from the first pass. Your "yes" starts the second pass. The second pass is plain code, not the AI. It reads your wallet, your balance and your holding again, then compares them to the card.
The second pass fails closed. If Mage cannot verify your wallet, your balance or your holding, it cancels the trade instead of guessing.
Trade size caps
| Cap | Where it applies |
|---|---|
| $500 | One memecoin trade on Robinhood Chain or Base |
| $2000 | One send to an outside address |
| $1000 | One bridge between chains |
Over the memecoin cap, Mage cancels.
The send cap applies when Mage can price what you send. Over it, Mage answers ❌ Over the per-send cap. Over the bridge cap, Mage answers ❌ Bridge cancelled — over the $1000 per-bridge cap.
Price impact
Price impact is how far your own trade moves the token price. On memecoins, Mage measures it before the fill and stops at 15%. This applies on Robinhood Chain and on Base.
A smaller amount can pass. The ceiling protects the price you get.
Slippage
Slippage is how far the fill price can move from the quoted price before the trade fails. Mage sets it per venue. You cannot change it by text.
| Venue | Slippage |
|---|---|
| Memecoins on Robinhood Chain | 3% |
| Memecoins on Base | 1% |
| Solana buys | 0.5% |
| Solana sells | 2% |
| Perps market orders | 1.5% |
A perp order is a market order with a 1.5% price bound. In a fast market the order can stay unfilled instead of filling far from the quoted price.
Sells and closes are a percent
Every sell is a percent of what you hold, from 1 to 100. Every perp close is a percent of the position, from 1 to 100. You cannot sell a dollar amount.
Outside 1 to 100, Mage cancels with ❌ Sell percent must be between 1 and 100 — trade cancelled. A perp close reads ❌ Close percent must be between 1 and 100 — trade cancelled.
Leverage
Leverage multiplies your losses as well as your gains. A leveraged position can be liquidated. Trade with money you can afford to lose.
You give the size in dollars and the side. Mage derives the leverage from your collateral and shows it on the card. The cap is 10x.
Add collateral or ask for a smaller size.
Perps minimums
| Action | Minimum |
|---|---|
| First deposit to your perps account | $5 |
| Top-up from Robinhood Chain USDG | $6 |
| One order | Set by the market |
| Withdrawal | At least $5 |
Mage suggests $20 for a first deposit. Each perp market sets its own order floor, so the minimum order changes by market. Under the floor, Mage names the floor and asks for more.
The withdrawal minimum is at least $5, and Mage raises it when the venue fee is higher. The card shows the exact fee before you confirm. A small withdrawal is expensive in percent terms, because the fee does not shrink with the amount.
Gas stays in your wallet
A buy never spends your last gas. A memecoin buy on Robinhood Chain or on Base leaves 0.00005 ETH in your wallet, so you can always pay for the exit.
Every send of a native coin keeps a reserve back on that chain for the same reason. See Send crypto out for the amount per chain.
Pool checks
Before a memecoin trade, Mage checks the pool. Two answers stop the trade.
The pool can be too thin to fill your trade safely.
Mage can also fail to confirm that you can sell the token again.
On Base the same refusal reads failed the exit-route check. Both checks run again on the second pass, after your "yes".