Skip to content

fix: avoid duplicate WETH in swap path when input/output is WETH (closes #363) #459

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
liquid-8 merged 4 commits into from
Jul 29, 2026
Merged

fix: avoid duplicate WETH in swap path when input/output is WETH (closes #363) #459

Changes from 2 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
180724b
fix: avoid duplicate WETH in swap path when input/output is WETH (clo…
AIFF55 May 28, 2026
34bbc25
fix: also avoid duplicate WETH in _token_to_token_swap_output (closes…
AIFF55 May 28, 2026
4716d94
fix: use is_same_address() for WETH comparison in _token_to_token_swa…
AIFF55 May 28, 2026
c2e0aae
Update uniswap/uniswap.py
liquid-8 Jul 28, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 14 additions & 2 deletions uniswap/uniswap.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -742,11 +742,17 @@ def _token_to_token_swap_input(
)
else:
func = self.router.functions.swapExactTokensForTokens
weth_address = self.get_weth_address()
if is_same_address(input_token, weth_address) or is_same_address(output_token, weth_address):
path = [input_token, output_token]
else:
path = [input_token, weth_address, output_token]

return self._build_and_send_tx(
func(
qty,
min_tokens_bought,
[input_token, self.get_weth_address(), output_token],
path,
recipient,
self._deadline(),
),
Expand Down Expand Up @@ -1004,11 +1010,17 @@ def _token_to_token_swap_output(
input_token, output_token, qty, fee=fee
)
amount_in_max = int((1 + slippage) * cost)
weth = self.get_weth_address()
path = (
[input_token, output_token]
if input_token == weth or output_token == weth
else [input_token, weth, output_token]
)
Comment thread
liquid-8 marked this conversation as resolved.
return self._build_and_send_tx(
self.router.functions.swapTokensForExactTokens(
qty,
amount_in_max,
[input_token, self.get_weth_address(), output_token],
path,
recipient,
self._deadline(),
),
Expand Down