Crypto exchange aggregators: how they work
A crypto exchange aggregator finds and routes token swaps across many exchanges. It usually holds no funds, and its route can split to reduce slippage.
Vahe HakobyanEditor-in-chief
Updated Oct 6, 20263 min readFact-checked
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It sits above trading venues and asks them for quotes. A single exchange matches orders on its own books. You connect a wallet and approve the swap, and the aggregator arranges the route.
How does an aggregator find the best price?
The aggregator asks many exchanges for quotes at once. It compares price, liquidity and likely slippage. If one venue cannot fill the order well, it can split the order across several exchanges. Slippage is the gap between the price you see and the price you get.
- Quoted price at each venue
- Liquidity and order depth
- Estimated slippage
How do you use an aggregator?
You connect a wallet, choose two tokens, and enter an amount. The aggregator shows a route and an estimated output. It usually does not hold your funds; non-custodial services usually run the swap through smart contracts. You may pay a service charge, plus network costs and slippage separately.
What are the risks and limits?
Aggregators route through smart contracts on several venues, and a user can create a token. A failed swap usually cannot be reversed, and the network fee is still spent. In the US, the IRS treats crypto as property, so a swap from one token to another is a reportable event.
- Smart-contract bugs that can lock funds
- Malicious tokens with hidden fees or no market
- Failed swaps with spent network costs
- Little or no customer support
How is it different from an exchange?
An aggregator is a routing layer above many venues, while a single exchange is one venue. A decentralized exchange does not store users' funds, and an aggregator can route to it. Many aggregators are non-custodial and may not require identity checks. In the US, a centralized exchange that holds customer funds usually registers with FinCEN as a money services business, while a non-custodial aggregator may not.
Frequently asked questions
A non-custodial aggregator usually asks you to connect a wallet, not to open an account. A centralized service that holds funds can require both.
US law does not have a blanket ban on non-custodial swap tools, but securities, money-transmission and tax rules can still apply.
A failed swap usually cannot be reversed, and the network fee is still spent. A fake token may have no market, so you may be unable to sell it.
Usually not. Aggregators swap one crypto for another, so dollar purchases happen at an exchange or a broker.
