Get Started
Follow a complete step-by-step flow to call `Firepit.release()` in the Uniswap Protocol Fee system.
In the current version of the Uniswap Protocol Fee system, participants can call Firepit.release() when releasable asset value exceeds the required UNIÂ amount.
The simplest way to interact with the system is calling Firepit.release() from a wallet.
It is possible to interact with the Firepit contract via a custom smart contract to enable:
- slippage / balance checks
- Uniswap v3 Fee collection
- Uniswap v2 LP Token redemptions
- UNI token flash loans
Step 1: Acquire a Sufficient Amount of UNI
The Firepit contract requires integrators to hold a minimum amount of UNI to call release().
Participants can view the threshold by calling Firepit.threshold()
uint256 threshold = IFirepit(address(0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721)).threshold();cast call 0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721 "threshold()(uint256)" --rpc-url <RPC_URL>Step 2: Approve the Firepit to Spend UNI
Because the Firepit contract transfers UNI to address(0xdead), integrating addresses must first approve the contract to spend their UNI
Integrators should assess the risks of max approving the Firepit contract
IERC20(0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984).approve(
0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721,
type(uint256).max
);cast send 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 \
"approve(address,uint256)(bool)" \
--rpc-url <RPC_URL> \
0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721 \
115792089237316195423570985008687907853269984665640564039457584007913129639935Step 3: Read the Nonce
The Firepit contract uses a nonce as a safety mechanism to avoid malicious front-running. The value provided to release(...) must be equal
to the value in contract storage
uint256 nonce = IFirepit(address(0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721)).nonce();cast call 0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721 "nonce()(uint256)" --rpc-url <RPC_URL>Step 4: Call Firepit.release()
Once the value of the assets exceeds the value of the UNI tokens, integrators should call Firepit.release()
uint256 _nonce = IFirepit(address(0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721)).nonce();
Currency[] memory _assets = new Currency[](3);
_assets[0] = Currency.wrap(address(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)); // USDC
_assets[1] = Currency.wrap(address(0xdAC17F958D2ee523a2206206994597C13D831ec7)); // USDT
_assets[2] = Currency.wrap(address(0x0000000000000000000000000000000000000000)); // ETH
IFirepit(address(0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721)).release(_nonce, _assets, 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045);cast send 0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721 "release(uint256,address[],address)" --rpc-url <RPC_URL> \
<CURRENT_NONCE> <ASSET_ADDRESSES> <RECEIVER_ADDRESS>
# example: release USDC, USDT, and ETH to vitalik.eth
cast send 0x0D5Cd355e2aBEB8fb1552F56c965B867346d6721 "release(uint256,address[],address)" --rpc-url <RPC_URL> \
0 \
0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,0xdAC17F958D2ee523a2206206994597C13D831ec7,0x0000000000000000000000000000000000000000 \
0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045Verification
Confirm the release transaction is successful and inspect token transfers to verify UNI was burned and assets were released to the configured recipient.