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LexChex / LexChexMinter

MetaLeX's onchain accreditation-credential system. A LeXcheX credential is a soulbound (non-transferable) NFT implementing ERC-5484.

ERC-5484 (soulbound)

ILexChex extends IERC5484, which defines burnAuth(tokenId) returning a BurnAuth enum (IssuerOnly, OwnerOnly, Both, Neither) and an Issued event. The credential cannot be transferred between wallets.

Interface

function mint(address to, Accreditation acc) external returns (uint256);
function burn(uint256 tokenId) external;
function setAccreditation(uint256 tokenId, Accreditation acc) external;
function accreditations(uint256 tokenId) external view returns (Accreditation);
function getAccreditation(uint256 tokenId) external view returns (Accreditation);
function getAccreditationByOwner(address owner) external view returns (uint256);
function getTokenIdsByOwner(address owner) external view returns (uint256[]);
function hasValidLexCheX(address owner) external view returns (bool);
function isValid(uint256 tokenId) external view returns (bool);
function balanceOf(address owner) external view returns (uint256);
function burnAuth(uint256 tokenId) external view returns (BurnAuth);

The Accreditation struct is defined in src/creds/storage/lexchexStorage.sol.

How it's used

  • hasValidLexCheX(owner) is the headline check — it answers "does this address hold a currently-valid credential?"
  • A lexchexCondition (see Conditions) wraps this check so it can gate issuance, rounds, scripification, and deals.
  • The LexChexMinter issues credentials; the LeXcheX app and oracle (metalex-webapp) drive the off-chain verification that backs a mint.