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feat: encode Uniswap v3 multihop paths #477

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feat: encode Uniswap v3 multihop paths #477

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14 changes: 8 additions & 6 deletions uniswap/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -88,12 +88,14 @@ def _load_contract_erc20(w3: Web3, address: AddressLike) -> Contract:


def _encode_path(token_in: AddressLike, route: List[Tuple[int, AddressLike]]) -> bytes:
"""
Needed for multi-hop swaps in V3.

https://github.com/Uniswap/uniswap-v3-sdk/blob/1a74d5f0a31040fec4aeb1f83bba01d7c03f4870/src/utils/encodeRouteToPath.ts
"""
raise NotImplementedError
"""Encode a Uniswap V3 route as tightly packed token and fee values."""
path = bytearray(_str_to_addr(token_in))

@greptile-apps greptile-apps Bot Aug 9, 2026

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P2 Empty routes produce invalid paths

An empty route skips the loop and returns only the 20-byte input-token address, while a valid Uniswap V3 path requires at least one fee-and-token hop. Rejecting this input locally prevents callers from passing malformed path bytes to a router or quoter and receiving an opaque contract revert.

Suggested change
path = bytearray(_str_to_addr(token_in))
if not route:
raise ValueError("route must contain at least one hop")
path = bytearray(_str_to_addr(token_in))

Knowledge Base Used: Token Registry, Fee Tiers, Constants, and Shared Utilities

for fee, token in route:
if not 0 <= fee < 2**24:
raise ValueError(f"fee must fit in uint24: {fee}")
path.extend(fee.to_bytes(3, byteorder="big"))
path.extend(_str_to_addr(token))
return bytes(path)


# Adapted from: https://github.com/Uniswap/v3-sdk/blob/main/src/utils/encodeSqrtRatioX96.ts
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