Purchase (index_topic_1address buyer, uint256 amountIn, uint256 amountOut)
[topic 0]:0x12cb4648cf3058b17ceeb33e579f8b0bc269fe0843f3900b8e24b6c54871703c
0x00000000000000000000000000000000000000000000000000039696f33920000000000000000000000000000000000000000000000000000000006780ab013e