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FeeModule

Source: contracts/src/stdlib/FeeModuleV2.sol

What it does​

FeeModuleV2 enforces a minimum fee per portal and schema:

mapping(address portal => mapping(bytes32 schemaId => uint256 attestationFee))
  public attestationFees;

If the forwarded value is lower than the configured fee, the module reverts.

Portal-owner configuration​

function setFees(address portal, bytes32[] calldata schemaIds, uint256[] calldata fees) public;

Only the portal owner can configure fees for that portal.

Important limitation​

This module validates the fee but does not route funds anywhere. The value remains in the portal contract. The portal owner can withdraw it with AbstractPortalV2.withdraw(...).

Also remember:

  • only one module in a portal chain should interpret msg.value;
  • bulk module execution currently uses 0 as forwarded value.