Swap

Seidar aggregates liquidity from supported Stellar DEXs and gives you one swap interface with a single quote, route, and confirmation flow.

How it works

1. Select assets — choose the asset you want to swap from and the asset you want to receive.
2. Enter an amount — specify how much you want to swap.
3. Get a quote — Seidar compares available routes across supported venues.
4. Review the details — check the rate, price impact, minimum received, route, and network fee.
5. Sign the transaction — review and approve it in your Stellar wallet.

Seidar submits the signed transaction to Stellar and tracks it until it confirms.

Supported venues

Protocol	Type	Used for
Soroswap	AMM and DEX aggregation	Swaps and liquidity
Aqua	AMM liquidity layer	Swaps and liquidity
Phoenix	AMM	Swaps and liquidity
Sushi	AMM	Swaps and liquidity

Routing is not limited to a single venue. Seidar can compare direct pools and multi-hop routes through liquid intermediate assets such as XLM or USDC, then use the route with the best expected output.

Stellar asset model

Stellar assets are not all native tokens:

• XLM is the native Stellar asset.
• Issued assets are identified by an asset code and issuer account (for example USDC:GA5Z...).
• Soroban assets may also be identified by their contract address.

Before your wallet can hold an issued asset, it needs a trustline for that asset. If you do not have one, add it in your wallet first.

Swaps on Stellar do not use ERC-20-style token approvals. You sign one transaction that executes the swap.

Routing and price impact

Seidar evaluates:

• Direct pools between the two assets
• Multi-hop routes through liquid intermediate assets
• Available liquidity on each supported venue

Price impact is measured across the whole route, not just the first pool. A multi-hop route can produce a better result than a direct pool with thin liquidity.

note

A quote is an estimate. The final amount depends on pool state when your transaction executes. Minimum received protects you against excessive slippage.

Slippage tolerance

Slippage is the difference between the quoted price and the executed price. Configure it before you swap:

Preset	Tolerance
Low	0.1%
Default	0.5%
Medium	1.0%
High	3.0%
Custom	0.1% – 50%

caution

Setting slippage too low can cause the transaction to fail. Setting it too high can result in a worse execution price.

Swap details

Before you sign, Seidar shows:

• Exchange rate — output asset per input asset
• Price impact — how the swap affects the pool price
• Minimum received — the minimum output after slippage
• Network fee — the Stellar fee, paid in XLM
• Route — the venue or venues used
• Protocol fees — liquidity provider fees embedded in the quote

Network fees and reserves

Every Stellar transaction pays a small network fee in XLM. Your account must also maintain Stellar's minimum reserve, including the reserve for any trustlines. Keep enough XLM in the wallet to cover both.

Token search

Find an asset by:

• Asset code (for example USDC)
• Asset name
• Issuer account
• Soroban contract address

Always verify the issuer when swapping an issued asset. Multiple assets can share the same code.

Transaction history

Completed swaps appear in Transaction History with:

• Input and output assets
• Amounts
• Route and venue
• Transaction hash
• Timestamp

Risks

• Slippage — the executed price can differ from the quote.
• Thin liquidity — low-depth pools can move significantly.
• Issuer risk — an issued asset depends on its issuer.
• Smart contract risk — AMM and aggregator contracts can contain bugs.
• Trustline requirements — you cannot receive an issued asset without a trustline.