Lesson: 9- Who pays for the gas usage to call performUpkeep() and fulfillRandomWords()

[ManuWeb3]

Hi all,

Both performUpkeep() and fulfillRandomWords() consume gas.

Who's paying for that gas for both of these functions? Is it the Owner of the contract ?

Or does it get settled from the LINK token that we spend when these functions get invoked by Chainlink nodes ?

Or something else ?

[krakxn]

Reply with this specific txn hash, I will look into it

[ManuWeb3]

thanks, sure,

0xee4da5ba9e0915e869a2193fbca1ffbda2945774263d8d33b4f16ab72b7ca11c

This is 1st in the set of 4 transactions that run in the same manner upon every enterRaffle.

Just in case, you'd require to dig deeper, below is the link:

https://rinkeby.etherscan.io/address/0xb8163E10dCb253D48379e248714dBd1242A726a1#internaltx

[krakxn]

The gas is paid to the KeepersRegistry source contract, which is a further set of 17 or so contracts, which does all the work.

From? This is not precise—from the rationale I am seeking—but the general concept should be the same. I believe it is the address which performs all the Upkeep functions, as evident from its txns. I presume it is related in some form to your subscription where you deposit a set amount of $LINK (to pay for gas).

@PatrickAlphaC Could you confirm if the italicized part—in this reply—is precise?

[ManuWeb3]

Ok.
Actually, the root cause of my concern:

If the owner pays this Gas, then how come the winnerEndingBalance matched winnerStaringBalance in this assert in the Staging test : assert.equal(winnerEndingBalance.toString(), winnerStartingBalance.add(raffleEntranceFee).toString()) without accouting for the Gas Cost ?

But if your italics hold good, then it all makes sense.