API reference
Sending the transaction
What the user signs after a quote, and what happens if the price moves.
Approval
When approvalAddress is set, the user approves exactly fromAmount of fromToken to it (our contract) first.
Ask for exact approvals, never unlimited ones. Tokens like USDT that refuse a new approval over an old one need an approval of 0 first.
Selling the coin
When fromToken is the coin, there is no approval; transactionRequest.value carries the amount.
Sending
Send to, data and value unchanged. Let the wallet estimate gas, or use gasEstimate with some margin.
Reverts
A trade that would give less than toAmountMin, or whose swap fails, reverts as a whole: the user keeps the tokens and pays only gas. Quote again and retry.