Quote freshness

Decision Table

Need	Action
Display indicative pricing	Quote without `sender` and refresh on user action
Build transaction data	Requote with `sender` when the user confirms
Require Stellar ledger freshness	Set `fresh=true` on the Stellar quote endpoint
Compare route detail	Pass `includePaths=true` for the request you inspect
Retry after route failure	Requote; do not reuse old transaction data

Worked Example

curl "https://swap.xoxno.com/api/v1/quote?\
from=WEGLD-bd4d79&\
to=USDC-c76f1f&\
amountIn=1000000000000000000&\
slippage=0.01&\
sender=erd1..."

Verify the result before signing:

amountOut matches the UI route.

amountOutMin reflects the slippage tolerance you showed the user.

transaction or txData came from the same quote request.

The user has not changed token, amount, slippage, or sender since the quote.

Edge Cases

Case	Behavior	Fix
User changes slippage after quote	Encoded transaction data can carry the old minimum output.	Requote.
User changes sender	Nonce, gas, source account, or envelope fields can differ.	Requote with the new sender.
Pool state changes before signing	Output can differ on-chain or fail slippage checks.	Requote near confirmation.
Stellar snapshot is stale	`fresh=true` can return 409 when drift is above the service threshold.	Retry after the snapshot catches up.

Do not reuse txData, transaction objects, or TransactionEnvelope values across quote requests.

Definition