Wrapped Filecoin (WFIL) is an Filecoin (FIL) ERC-20 wrapper. You can deposit FIL and obtain a WFIL balance which can then be operated as an ERC-20 token. You can withdraw FIL from WFIL, which will then burn WFIL token in your wallet. The amount of WFIL token in any wallet is always identical to the balance of FIL deposited minus the FIL withdrawn with that specific wallet.

flashMinted()

Returns current amount of flash-minted WFIL token.

function flashMinted() external view returns(uint256);

deposit()

msg.value of FIL sent to this contract grants caller account a matching increase in WFIL token balance.

Emits {Transfer} event to reflect WFIL token mint of msg.value from address(0) to caller account.

function deposit() external payable;

depositTo(address to)

msg.value of FIL sent to this contract grants to account a matching increase in WFIL token balance.

Emits {Transfer} event to reflect WFIL token mint of msg.value from address(0) to to account.

    function depositTo(address to) external payable;

withdraw(uint256 value)

Burn value WFIL token from caller account and withdraw matching FIL to the same.

Emits {Transfer} event to reflect WFIL token burn of value to address(0) from caller account.

Requirements:

• caller account must have at least value balance of WFIL token.

function withdraw(uint256 value) external;

withdrawTo(address payable to, uint256 value)

Burn value WFIL token from caller account and withdraw matching FIL to account (to).

Emits {Transfer} event to reflect WFIL token burn of value to address(0) from caller account.

Requirements:

• caller account must have at least value balance of WFIL token.

function withdrawTo(address payable to, uint256 value) external;

withdrawFrom(address from, address payable to, uint256 value)

Burn value WFIL token from account (from) and withdraw matching FIL to account (to).

Emits {Approval} event to reflect reduced allowance value for caller account to spend from account (from),unless allowance is set to type(uint256).max

Emits {Transfer} event to reflect WFIL token burn of value to address(0) from account (from).

Requirements:

• from account must have at least value balance of WFIL token.

• from account must have approved caller to spend at least value of WFIL token, unless from and caller are the same account.

function withdrawFrom(address from, address payable to, uint256 value) external;

depositToAndCall(address to, bytes calldata data)

msg.value of FIL sent to this contract grants to account a matching increase in WFIL token balance,after which a call is executed to an ERC677-compliant contract with the data parameter.

Emits {Transfer} event.

Returns boolean value indicating whether operation succeeded.

For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677.

function depositToAndCall(address to, bytes calldata data) external payable returns (bool);

approveAndCall(address spender, uint256 value, bytes calldata data)

Sets value as allowance of spender account over caller account’s WFIL token, after which a call is executed to an ERC677-compliant contract with the data parameter.

Emits {Approval} event.

Returns boolean value indicating whether operation succeeded.

For more information on {approveAndCall} format, see https://github.com/ethereum/EIPs/issues/677.

function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);

transferAndCall(address to, uint value, bytes calldata data)

Moves value WFIL token from caller’s account to account (to), after which a call is executed to an ERC677-compliant contract with the data parameter.A transfer to address(0) triggers an FIL withdraw matching the sent WFIL token in favor of caller.

Emits {Transfer} event.

Returns boolean value indicating whether operation succeeded.

Requirements:

• caller account must have at least value WFIL token.

For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677.

function transferAndCall(address to, uint value, bytes calldata data) external returns (bool);