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Selling lets another contract transfer the specified token amount from your wallet. ERC-20 allowance is therefore required.

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Curve sell flow

  1. Enter the token amount and review the onchain quoteSell result.
  2. The app calculates minEthOut from your slippage setting.
  3. If allowance is insufficient, the app simulates an exact approval to the per-token curve and requests an approval signature.
  4. It waits for the approval receipt, verifies success, and re-reads allowance until the confirmed state is visible.
  5. It rechecks wallet, network, balance, allowance, quote deadline, and curve state.
  6. It simulates sell(tokensIn, minEthOut, deadline) and requests the separate sell signature.
  7. It reports success only after the sell receipt succeeds.

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Graduated-token sell flow

The spender is Uniswap’s configured SwapRouter02 rather than the curve. The same approval-first rule applies. The swap uses the canonical 1% token/WETH pool and unwraps WETH output to ETH for the active wallet.
Approval and sale can require two wallet confirmations and two gas payments. A successful approval does not guarantee the subsequent sell will succeed. Verify the spender and amount before approving.