Why "risk-free" is a myth
The idea really is market-neutral: you buy and sell at the same time, so the direction of the price does not matter. But that is only true once both trades are done. Every other moment you are exposed, and that is exactly where people lose.
Risk one: the second leg that never closed
You bought on one venue and failed to sell on the other: the order did not fill, the transfer took forty minutes, the exchange went into maintenance. For all that time you are holding an ordinary directional position you never asked for.
What to do: execute the leg on the thinner venue first. Keep balances pre-positioned on both exchanges so you do not have to move coins between trades. Do not enter a route whose second leg cannot be executed immediately.
Risk two: closed withdrawals
The most common reason a "profitable" route does not work. The coin was bought cheaply but cannot leave the exchange: the network is under maintenance, withdrawals are suspended, or the exchange does not support the chain you need. The money is locked while the spread walks away.
What to do: check deposit and withdrawal status on the network you need before buying, not after. It takes half a minute in your account.
Risk three: the matching ticker
BTCS, AI or HTX can be entirely different tokens on different venues. This applies especially to DEX pools, where anyone can mint a token with any ticker. A spread in the hundreds of percent is almost always this.
What to do: verify the contract address. We filter such pairs automatically, but the final check is always yours.
Risk four: P2P and your bank
On P2P the bank joins the list. A card can be frozen over suspicious inflows, and a payment can be reversed if the money came from a fraudster. That subject has its own article on P2P scam patterns.
What to do: never release crypto before the money has actually landed, match the sender's name to the name on the deal, and stay inside the exchange chat.
Risk five: the cost of execution
Fees, slippage, gas and withdrawal costs together often exceed the whole spread. This is not a disaster but a quiet leak: a run of trades that nets roughly zero, looks like work and pays nothing.
What to do: calculate the net result before the trade, not after. Every table here carries a Net column for that.
A few rules that work
- Never put your full size into the first trade of a new route. Start with a small test.
- Keep a stablecoin reserve on every venue you use, so the second leg fills immediately.
- Log every trade: entry, exit, fees, result. After a month it becomes obvious which routes pay and which only look like they do.
- Count your time. A route that yields $4 and takes an hour is a four-dollar-an-hour job.
- Distrust promised percentages. No service, ours included, knows what you will earn. We show numbers; the decision and the risk are yours.