Same block Swap before an Approval is allowed?

Question

I had the understanding that Approval in the same block as a Swap had to have a higher gas price as to be processed before the Swap when the block is being produced; that's until I found blocks on the mainnet where Approval came after the Swap, just how is this allowed?

For example this swap had no previous approvals and the same block approval was positioned after the swap in the produced block:

# Block	# Block pos	Function	Gas Price	Txn
17915586	10	Swap	37.7965 Gwei	0xc54dc9f3fbb483f2f039e201e5d31b3ad2da067b0bbe2e2882adbe826d36b4b0
17915586	11	Approve	37.7965 Gwei	0x5efa7e8a990761142d32902dfcdbbf4df09bafd4ba547c47bcb3b3f7191d2f25

Here's links to these two txns: https://etherscan.io/tx/0xc54dc9f3fbb483f2f039e201e5d31b3ad2da067b0bbe2e2882adbe826d36b4b0 https://etherscan.io/tx/0x5efa7e8a990761142d32902dfcdbbf4df09bafd4ba547c47bcb3b3f7191d2f25

-TIA

Answer 1

Here's what happened:

• The first transaction is swap from some ETH to the iGP token.

• The second transaction is approval for subsequent iGP trading.

The swap does not need an approval because the user is not sending any token to the contract, they are sending ETH, which is the native currency of the Ethereum blockchain and is handled in a specific way both by the chain and by Uniswap contracts.

The user probably fired the approval tx immediately after the swap tx because they want to be able to sell iGP without any delay at the time they want to, in the future.