You send one coin and a different one comes back. The middle tends to be a shrug. This is that middle, opened up: the five steps you take, and the four things happening underneath while you wait. If your SimpleSwap review comes down to a single question - what actually happens to my funds between “send” and “received” - here is the whole answer, with nothing left in the box.

A swap can feel like a vending machine you can’t see inside. Money goes in one slot, something else drops out another, and you’re asked to trust the wiring in between. In crypto specifically, that request should make you uncomfortable, because “trust the wiring” is the exact habit self-custody was built to retire.

So instead of asking for that trust, we’d rather spend this article earning it the boring way: by showing you the wiring. Here’s a swap from both sides at once. Five steps on your side. Four layers on ours.

The five steps you take

Step 1 - Choose the pair

You pick the asset you’re sending and the one you want back. Before you commit to anything, the interface returns an estimated rate, calculated against live liquidity right at that moment. This ordering is deliberate: you see the expected result first, so you decide with a number in front of you rather than after the fact.

Step 2 - Pick the rate type

Two options, and the tradeoff between them is stated plainly rather than buried in a settings menu.

A fixed rate locks the price for 20 minutes. You know exactly what you’ll receive, whatever the market does while your transfer is being confirmed, as long as your deposit lands within the window. It carries a slightly wider spread, which is simply the price of that certainty.

A floating rate follows the market to the moment of execution. It can land a little better if prices move your way, a little worse if they don’t.

Neither hides anything from you. They’re two honest answers to one question: do you want certainty, or a shot at a marginally better number?

Step 3 - Enter the receiving address

You provide the wallet to which the converted asset should be sent. If that asset exists on more than one network, you choose the correct one before entering the address. Transparency means being straight about the risk here too: send to the wrong network and the funds can be lost, and no service can undo it. The interface shows the required network clearly, but the final check is yours. That responsibility isn’t a flaw in the design. It’s the logic of self-custody, which removes the middleman in both directions at once.

Step 4 - Send the deposit

We generate a unique deposit address for this one transaction, and you send your crypto to it from your own wallet. That’s the last thing you do. It’s also the moment the transfer becomes irreversible: once it’s on-chain, it can’t be recalled, which is precisely why every check worth doing happens before this step and none after.

Step 5 - Receive

Once your deposit reaches the required confirmations, the swap is routed through the best available path, executed against live liquidity, and the converted asset is sent to the address you gave. From where you’re sitting, it felt like an ordinary wallet transfer. The difference from a black box is that every swap carries a unique order ID with real-time status, so if something slows down - network congestion, a routing delay - you watch it happen instead of guessing. If it stalls, live chat is there around the clock.

What’s happening underneath

“Aggregator” is a tidy word for real machinery. The clearest way to picture it is four layers, running quietly in the seconds and minutes those five steps take.

First, liquidity sourcing. Rather than holding its own order book, the platform keeps live connections to a wide network of providers across both centralized and decentralized venues, each exposing its own live prices and available pairs. That’s the raw material.

Second, route selection. For your exact pair at a given size and network, the system works out which provider or combination offers the best executable route at that moment, splitting across sources where that helps. This is the layer that spares you from opening accounts on a handful of exchanges and comparing them by hand.

Third, execution. Once your deposit arrives, the swap travels the chosen route. Intermediate steps, like cross-chain conversions, are handled internally, so you see the input and the output, not every hop between them. This layer is also where the numbers that matter to a review live. On the majority of floating swaps, the amount you actually receive lands within 99.998% of the estimate you were shown, which on a larger check is the whole difference between predictable execution and a balance-sheet surprise. Speed is a function of the chains involved rather than the platform: fast networks like Solana or Polygon settle in under a minute, while Bitcoin and Ethereum typically take 10 to 30 minutes depending on congestion. And because liquidity is pooled from more than 20 providers rather than drawn from a single venue, price impact stays contained even on swaps worth hundreds of thousands. 

Fourth, confirmation and tracking. Each swap gets its order ID and a live status trail, so a delay at any layer surfaces in the open instead of vanishing into silence.

Read the two halves together, and the core design choice is clear: we don’t run an order book, and we don’t hold your balance between swaps. The model behaves less like an exchange you keep an account with and more like a broker for a single transaction. You supply the inputs, the result lands in your wallet, and the sourcing and routing happen across aggregated liquidity without you managing any of it.

“A black box asks you to trust it. We would rather hand you something to check at every step: the quote before you commit, the order ID while it runs, the exact network before you send. A process you can watch is one you don’t have to take on faith, and in self-custody that’s the only kind worth building.”

Stefan Lauer, Head of Infrastructure, SimpleSwap

Why we’re showing you the wiring

Everything above is really one argument: at each stage, there’s something you can verify.

You see the estimate before you commit. You choose the certainty-versus-price tradeoff yourself, with both sides on the table. The fee isn’t a separate surprise deduction; it’s built into the quoted rate, so the number you’re shown is the number you receive. And once funds move, the order ID gives you a window into a process you’d otherwise just have to assume was working.

The honest limits belong to the same transparency, so here they are. Self-custody means there’s no platform to reverse a mistake, so a wrong-network send is on you. A confirmed transfer can’t be clawed back by anyone. And a swap aggregator is built for convenience, not for shaving the last basis point off a trade, so a high-frequency trader comparing spreads across five venues will find tighter numbers on a centralized exchange. None of that is hidden in the mechanics, because hiding it is exactly what would make the mechanics untrustworthy.

If you want the long version

This is the short, practical walk-through. We made the full-length argument why this kind of “boring” infrastructure is what actually earns trust in crypto’s second decade, as a CryptoSlate special project. If the four layers above interest you more than they intimidate you, that’s the deeper read.

No box, just wiring

A swap that can’t explain itself is asking for the trust self-custody was designed to remove. The point of walking through the five steps and the four layers isn’t the walk-through; it’s that every stage turns out to have a surface you can check - a quote before you commit, a stated tradeoff, a bundled fee, a tracking window, and a set of limits named out loud. That’s what a review should really be testing for, on any swap service, and it’s a better test than any marketing line, including this one.

This article was written by SimpleSwap — a self-custodial multi-source swap aggregator. 2,800+ assets, 20+ liquidity providers across CEX and DEX sources, 20M+ swaps since 2018. Wallet-to-wallet by design, with routing handled under the hood.

This article is for educational purposes only and is not financial advice. A swap moves funds between wallets you control and, once confirmed on-chain, cannot be reversed. SimpleSwap’s only official domain is simpleswap.io.