Royalties

Royalties are not a suggestion. They are the entire revenue model for holders. Every secondary sale routes 10% of the price through the Vault.

Where the mint funds go

100% of mint proceeds go directly to the deployer's wallet. Not to the holder pool. Not to a treasury. The contract sends them straight via a single, isolated function:

Glyphs.sol

function mint(uint256 quantity) external payable nonReentrant {
    if (!mintOpen) revert MintClosed();
    if (quantity == 0) revert InvalidQuantity();
    if (mintedBy[msg.sender] + quantity > MAX_PER_WALLET) revert WalletCapExceeded();
    if (_totalMinted() + quantity > SUPPLY) revert SupplyExceeded();
    if (msg.value != MINT_PRICE * quantity) revert WrongPrice();
    if (address(vault) == address(0)) revert ZeroAddress();
 
    unchecked { mintedBy[msg.sender] += quantity; }
    _mint(msg.sender, quantity);
    vault.receiveMint{value: msg.value}();
}

The Vault's receiveMint is only callable by the NFT contract and only deposits to the deployer balance:

Vault.sol

function receiveMint() external payable onlyGlyphs {
    deployerBalance += msg.value;
    emit RoyaltyReceived(msg.sender, msg.value, 0, msg.value);
}

Why it matters: the holder pool is fed only by secondary trading volume, not by minting. Minting is the deployer's revenue. Trading is the holders' revenue. Clean separation.

EIP-2981

Turtle Fees implements EIP-2981 — the on-chain royalty standard. Marketplaces query the NFT contract before completing a sale and learn:

Receiver: the Vault contract
Royalty: 10% (1000 bps)

Glyphs.sol

function royaltyInfo(uint256, uint256 salePrice)
    external view override
    returns (address receiver, uint256 royaltyAmount)
{
    return (address(vault), (salePrice * ROYALTY_BPS) / 10_000);
}

Which marketplaces honor it

Turtle Fees lives on Robinhood Chain, and the marketplace landscape there works in holders' favor:

Marketplace	Honors EIP-2981
OpenSea (live on Robinhood Chain since launch week)	✅ Yes (creator-set, on-chain)

⚠️

Realistic capture rate: near-total. OpenSea — the first major marketplace on Robinhood Chain — honors creator-set on-chain royalties. Royalty-optional venues like Blur have no deployment on the chain today. If new marketplaces arrive, EIP-2981 travels with the token: any compliant venue pays the Vault automatically. We do not use Operator Filter — blocking venues kills liquidity, which hurts every holder more than it helps.

Why 10% (and not 5%)

Most projects do 5% royalties. We do 10% — and 90% of it goes back to holders. Net to holders: 9% of every sale.

Project	Royalty	Holder cut	Net to holder
Most legacy PFPs	2.5–5%	0%	0%
Souls-style yield projects	~5%	~80%	~4%
Turtle Fees	10%	90%	9%

Higher royalty + holder split = sustained yield as long as people trade.

Why we don't use Operator Filter

Operator Filter is a list-based blocker that prevents transfers via non-compliant marketplaces. It was popular in 2022–2023 but in 2026 it is widely seen as anti-user:

Blocks holders from listing on Blur (largest pro trader marketplace)
Locks NFTs into specific marketplaces
Breaks composability with newer protocols

We chose EIP-2981 standard over Operator Filter. You lose 15–25% of theoretical royalty but keep 100% of liquidity. The math favors holders.

→ The Vault → Don't Trust, Verify

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