TokensPurchased (index_topic_1address buyer, uint256 amount, uint256 cost)
[topic 0]:0x8fafebcaf9d154343dad25669bfa277f4fbacd7ac6b0c4fed522580e040a0f33
0x000000000000000000000000000000000000000000000000015181ff25a9800000000000000000000000000000000000000000000000001a4126c304016f0000