Crypto Marketplace & Decentralized Economy — Design Document

Created: February 13, 2026 Status: DEPRIORITIZED — V2.5+ (optional future phase) Version: V2.5+

Note (Feb 20, 2026): This feature was deprioritized during the Roadmap V2 Reorganization. The marketplace concept has evolved into the Knowledge Pipeline — where Spaces become shareable Integrations through the compilation chain. Crypto payments remain a future optional layer on top of this knowledge exchange. See ROADMAP.md — The Knowledge Pipeline for the current vision.

Overview

Transform the extension marketplace (Phase 3l) into a decentralized economy with cryptocurrency payments, data exchange, and smart contract automation. Users buy extensions with crypto, developers sell skills/data, and transactions are peer-to-peer with automated revenue sharing.

Key capabilities:

Crypto Payments — Buy extensions with BTC, ETH, stablecoins (USDC, DAI)
Data Marketplace — Sell trained models, datasets, custom prompts, memory exports
Smart Contracts — Automated revenue sharing, escrow, royalties via blockchain
Web3 Identity — Wallet-based authentication (MetaMask, WalletConnect)
NFT Extensions — Extensions as NFTs with transferable ownership licenses
DAO Governance — Community votes on marketplace policies, fee structure

Motivation

Problem: Traditional payment systems have limitations:

High fees — Stripe takes 2.9% + $0.30, slow payouts (7-14 days)
Geographic restrictions — Not available in all countries, currency conversion fees
Centralized control — Morphee controls marketplace, can censor/ban extensions
No data ownership — Users can't monetize their own data, models, or content
Limited programmability — Can't automate complex revenue sharing (e.g., 70% dev, 20% referrer, 10% DAO treasury)

Solution: Crypto-native marketplace with decentralized payments:

Instant settlement — Crypto payments confirmed in seconds (L2) or minutes (L1)
Global access — Anyone with a wallet can participate, no KYC for small amounts
Low fees — Blockchain gas fees often <$0.50, especially on L2s (Polygon, Arbitrum, Base)
Programmable money — Smart contracts automate splits, royalties, escrow
User sovereignty — Users own their data, can sell it directly to AI trainers
Decentralized governance — DAO controls marketplace rules, not a single entity

Use Cases

Persona	Scenario
Developer (Alex)	Publishes "Advanced Math Tutor" extension for 0.01 ETH (~$30) → users buy with crypto → instant payout to Alex's wallet
Teacher (Emma)	Sells curated lesson plan dataset (1000 prompts + responses) for 50 USDC → AI researchers buy it → smart contract splits: 80% Emma, 20% DAO treasury
Parent (Sophie)	Buys "Family Budget Tracker" extension with stablecoins → avoids credit card fees → pays $9.99 USDC monthly via auto-renewing smart contract
Data Scientist	Exports anonymized conversation data (10k messages, GDPR compliant) → sells to AI training company for 500 DAI → Morphee verifies data quality, takes 10%
AI Startup	Integrates Morphee SDK, pays API usage in crypto → smart contract tracks usage, auto-deducts from prepaid balance
Extension Creator	Mints extension as NFT → users buy NFT (one-time purchase) → resell on secondary market → creator gets 10% royalty on resales

Architecture

1. Crypto Payment Integration

Goal: Accept cryptocurrency for extension purchases, API usage, subscriptions.

Supported Cryptocurrencies

Asset	Network	Use Case	Rationale
ETH	Ethereum L1	Large purchases (>$100)	Most widely held crypto
ETH	Polygon, Arbitrum, Base (L2)	Small purchases (<$100)	Low gas fees (<$0.10)
USDC	Ethereum, Polygon, Base	Subscriptions, API payments	Stablecoin, no volatility
DAI	Ethereum, Polygon	Data marketplace	Decentralized stablecoin
BTC	Bitcoin L1	Large purchases (enterprise)	Store of value
Lightning BTC	Lightning Network	Microtransactions	Instant, near-zero fees

Payment Flow (Extension Purchase)

1. User: "Buy Math Tutor extension"
   → Frontend detects wallet (MetaMask, WalletConnect)
   → Fetches extension price: 0.01 ETH ($30)

2. Smart contract call:
   → User approves transaction in wallet
   → Smart contract executes:
     - Transfer 0.01 ETH from user → escrow contract
     - Mint NFT license → user's wallet
     - Split payment: 70% dev, 20% Morphee, 10% DAO treasury
     - Emit event: ExtensionPurchased(user, extension_id, tx_hash)

3. Backend listens for blockchain event:
   → Verifies transaction on-chain
   → Updates database: space_extensions (installed=true)
   → Sends confirmation: "Math Tutor installed!"

4. Developer gets paid:
   → 0.007 ETH ($21) instantly in their wallet
   → No waiting for Stripe payout

Smart Contract: ExtensionMarketplace

Deployed on: Ethereum, Polygon, Base (multi-chain)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MorpheeMarketplace is Ownable {
    struct Extension {
        address developer;
        uint256 priceWei;  // Price in wei (ETH) or smallest unit (USDC has 6 decimals)
        bool isActive;
        uint256 totalSales;
        string metadataURI;  // IPFS URI with extension manifest
    }

    mapping(bytes32 => Extension) public extensions;  // extensionId (keccak256) => Extension
    mapping(address => mapping(bytes32 => bool)) public licenses;  // user => extensionId => hasLicense

    uint256 public platformFeePercent = 20;  // 20% to Morphee
    uint256 public daoFeePercent = 10;       // 10% to DAO treasury
    address public daoTreasury;

    event ExtensionListed(bytes32 indexed extensionId, address indexed developer, uint256 price);
    event ExtensionPurchased(bytes32 indexed extensionId, address indexed buyer, uint256 price, bytes32 txHash);
    event LicenseTransferred(bytes32 indexed extensionId, address indexed from, address indexed to);

    constructor(address _daoTreasury) {
        daoTreasury = _daoTreasury;
    }

    function listExtension(
        bytes32 extensionId,
        uint256 priceWei,
        string memory metadataURI
    ) external {
        require(extensions[extensionId].developer == address(0), "Extension already listed");
        extensions[extensionId] = Extension({
            developer: msg.sender,
            priceWei: priceWei,
            isActive: true,
            totalSales: 0,
            metadataURI: metadataURI
        });
        emit ExtensionListed(extensionId, msg.sender, priceWei);
    }

    function purchaseExtension(bytes32 extensionId) external payable {
        Extension storage ext = extensions[extensionId];
        require(ext.isActive, "Extension not active");
        require(msg.value == ext.priceWei, "Incorrect payment amount");
        require(!licenses[msg.sender][extensionId], "Already owns license");

        // Calculate splits
        uint256 platformFee = (msg.value * platformFeePercent) / 100;
        uint256 daoFee = (msg.value * daoFeePercent) / 100;
        uint256 developerPayout = msg.value - platformFee - daoFee;

        // Transfer payments
        payable(ext.developer).transfer(developerPayout);
        payable(owner()).transfer(platformFee);
        payable(daoTreasury).transfer(daoFee);

        // Grant license
        licenses[msg.sender][extensionId] = true;
        ext.totalSales++;

        emit ExtensionPurchased(extensionId, msg.sender, msg.value, bytes32(block.number));
    }

    function transferLicense(bytes32 extensionId, address to) external {
        require(licenses[msg.sender][extensionId], "No license to transfer");
        require(!licenses[to][extensionId], "Recipient already has license");

        licenses[msg.sender][extensionId] = false;
        licenses[to][extensionId] = true;

        emit LicenseTransferred(extensionId, msg.sender, to);
    }

    function updatePrice(bytes32 extensionId, uint256 newPriceWei) external {
        require(extensions[extensionId].developer == msg.sender, "Not extension owner");
        extensions[extensionId].priceWei = newPriceWei;
    }
}

Backend: CryptoPaymentService

Location: backend/payments/crypto_service.py

import web3
from web3 import Web3
from eth_account import Account

class CryptoPaymentService:
    def __init__(self, rpc_url: str, contract_address: str, private_key: str):
        self.w3 = Web3(Web3.HTTPProvider(rpc_url))
        self.contract = self.w3.eth.contract(
            address=contract_address,
            abi=MARKETPLACE_ABI  # Loaded from JSON
        )
        self.account = Account.from_key(private_key)  # Morphee's hot wallet

    async def listen_for_purchases(self):
        """Background task: listen for ExtensionPurchased events."""
        event_filter = self.contract.events.ExtensionPurchased.create_filter(fromBlock='latest')

        while True:
            for event in event_filter.get_new_entries():
                extension_id = event['args']['extensionId']
                buyer = event['args']['buyer']
                price = event['args']['price']
                tx_hash = event['args']['txHash']

                # Verify transaction on-chain
                if await self.verify_transaction(tx_hash):
                    # Update database
                    await self.install_extension_for_user(buyer, extension_id)
                    # Send notification
                    await self.notify_user(buyer, f"Extension {extension_id} installed!")

    async def verify_transaction(self, tx_hash: str) -> bool:
        """Verify transaction exists and has sufficient confirmations."""
        tx = self.w3.eth.get_transaction(tx_hash)
        current_block = self.w3.eth.block_number
        confirmations = current_block - tx['blockNumber']
        return confirmations >= 3  # Wait for 3 confirmations

    async def get_extension_price(self, extension_id: str, currency: str = "ETH") -> dict:
        """Fetch current price from smart contract."""
        ext = self.contract.functions.extensions(extension_id).call()
        price_wei = ext[1]  # priceWei field

        # Convert to user-friendly units
        if currency == "ETH":
            price_eth = self.w3.from_wei(price_wei, 'ether')
            return {"amount": float(price_eth), "currency": "ETH", "wei": price_wei}
        elif currency == "USD":
            # Fetch ETH/USD price from oracle (Chainlink)
            eth_usd_price = await self.get_eth_price()
            price_usd = float(self.w3.from_wei(price_wei, 'ether')) * eth_usd_price
            return {"amount": price_usd, "currency": "USD", "wei": price_wei}

2. Web3 Wallet Integration

Goal: Users authenticate and pay with crypto wallets (MetaMask, WalletConnect).

Frontend: Web3 Provider

Location: frontend/src/lib/web3/provider.ts

import { createWeb3Modal, defaultConfig } from '@web3modal/ethers5';
import { ethers } from 'ethers';

// Configure Web3Modal (WalletConnect v2)
const projectId = 'YOUR_WALLETCONNECT_PROJECT_ID';

const metadata = {
  name: 'Morphee',
  description: 'AI Agent with Crypto Marketplace',
  url: 'https://morphee.app',
  icons: ['https://morphee.app/icon.png'],
};

const ethersConfig = defaultConfig({
  metadata,
  enableEIP6963: true,  // Multi-wallet support
  enableInjected: true,  // MetaMask
  enableCoinbase: true,  // Coinbase Wallet
});

const modal = createWeb3Modal({
  ethersConfig,
  chains: [
    { chainId: 1, name: 'Ethereum', rpc: 'https://eth.llamarpc.com' },
    { chainId: 137, name: 'Polygon', rpc: 'https://polygon-rpc.com' },
    { chainId: 8453, name: 'Base', rpc: 'https://mainnet.base.org' },
  ],
  projectId,
});

export class Web3Provider {
  private provider: ethers.providers.Web3Provider | null = null;
  private signer: ethers.Signer | null = null;

  async connect(): Promise<string> {
    await modal.open();
    const { address } = await modal.getAddress();
    this.provider = new ethers.providers.Web3Provider(window.ethereum);
    this.signer = this.provider.getSigner();
    return address;
  }

  async purchaseExtension(extensionId: string, priceWei: string): Promise<string> {
    if (!this.signer) throw new Error('Wallet not connected');

    const contract = new ethers.Contract(
      MARKETPLACE_CONTRACT_ADDRESS,
      MARKETPLACE_ABI,
      this.signer
    );

    const tx = await contract.purchaseExtension(extensionId, {
      value: priceWei,
    });

    const receipt = await tx.wait();
    return receipt.transactionHash;
  }

  async signMessage(message: string): Promise<string> {
    if (!this.signer) throw new Error('Wallet not connected');
    return await this.signer.signMessage(message);
  }
}

Wallet-Based Authentication

Users can sign in with their crypto wallet (no email/password needed):

// Sign-in flow
const web3 = new Web3Provider();
const address = await web3.connect();

// Backend generates nonce
const { nonce } = await api.post('/api/auth/web3/nonce', { address });

// User signs nonce with wallet
const signature = await web3.signMessage(`Sign in to Morphee\n\nNonce: ${nonce}`);

// Backend verifies signature
const { token } = await api.post('/api/auth/web3/verify', { address, signature, nonce });

// Store JWT token
authStore.setToken(token);

Backend verification:

from eth_account.messages import encode_defunct
from web3.auto import w3

async def verify_signature(address: str, signature: str, nonce: str) -> bool:
    message = f"Sign in to Morphee\n\nNonce: {nonce}"
    encoded_message = encode_defunct(text=message)
    recovered_address = w3.eth.account.recover_message(encoded_message, signature=signature)
    return recovered_address.lower() == address.lower()

3. Data Marketplace

Goal: Users sell trained models, datasets, prompts, memory exports to other users or AI companies.

Data Types

Data Type	Description	Price Range	Buyers
Custom Prompts	Curated system prompts for specific domains (legal, medical, education)	$5-$50	Other users, AI researchers
Conversation Datasets	Anonymized chat logs (GDPR compliant) for AI training	$100-$1000	AI companies, researchers
Trained Models	Fine-tuned models (LoRA adapters, embeddings)	$50-$500	Developers, enterprises
Memory Exports	Structured knowledge bases (git repos with Markdown + embeddings)	$10-$200	Power users, teams
Skills	AI-generated dynamic skills (tested, verified)	$5-$100	Other users
Component Templates	Pre-built UI components with AI interactions	$10-$50	Developers

Smart Contract: DataMarketplace

contract DataMarketplace {
    struct DataListing {
        address seller;
        uint256 priceWei;
        string dataHashIPFS;  // IPFS hash of encrypted data
        string metadataURI;   // Description, preview, license
        bool isActive;
        uint256 totalSales;
    }

    mapping(bytes32 => DataListing) public listings;
    mapping(bytes32 => mapping(address => bool)) public purchases;  // listingId => buyer => hasPurchased

    event DataListed(bytes32 indexed listingId, address indexed seller, uint256 price);
    event DataPurchased(bytes32 indexed listingId, address indexed buyer, uint256 price);

    function listData(
        bytes32 listingId,
        uint256 priceWei,
        string memory dataHashIPFS,
        string memory metadataURI
    ) external {
        require(listings[listingId].seller == address(0), "Already listed");
        listings[listingId] = DataListing({
            seller: msg.sender,
            priceWei: priceWei,
            dataHashIPFS: dataHashIPFS,
            metadataURI: metadataURI,
            isActive: true,
            totalSales: 0
        });
        emit DataListed(listingId, msg.sender, priceWei);
    }

    function purchaseData(bytes32 listingId) external payable returns (string memory) {
        DataListing storage listing = listings[listingId];
        require(listing.isActive, "Not active");
        require(msg.value == listing.priceWei, "Incorrect payment");
        require(!purchases[listingId][msg.sender], "Already purchased");

        // Payment split
        uint256 platformFee = (msg.value * 10) / 100;
        uint256 sellerPayout = msg.value - platformFee;

        payable(listing.seller).transfer(sellerPayout);
        payable(owner()).transfer(platformFee);

        purchases[listingId][msg.sender] = true;
        listing.totalSales++;

        emit DataPurchased(listingId, msg.sender, msg.value);

        // Return decryption key (stored off-chain, fetched via API with proof of purchase)
        return listing.dataHashIPFS;
    }
}

Data Encryption & Access Control

Flow:

Seller exports data:
- User: "Export my conversation dataset (anonymized)"
- Backend: Generates dataset, anonymizes PII, encrypts with AES-256
- Uploads encrypted file to IPFS (decentralized storage)
- Stores decryption key in VaultProvider
- Lists on blockchain with IPFS hash
Buyer purchases:
- Buyer sends crypto to smart contract
- Smart contract emits DataPurchased event
- Backend listens for event, verifies purchase on-chain
- Backend retrieves decryption key from vault
- Backend sends decryption key to buyer (only once, via encrypted channel)
- Buyer downloads encrypted file from IPFS, decrypts locally
Dispute resolution:
- If data quality is poor, buyer can dispute within 7 days
- DAO arbitrators review dispute
- If valid, smart contract refunds buyer from seller's escrow

4. NFT Extensions

Goal: Extensions as NFTs — one-time purchase, transferable ownership, resale with royalties.

ERC-721 Extension NFTs

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/common/ERC2981.sol";  // Royalty standard

contract MorpheeExtensionNFT is ERC721URIStorage, ERC2981 {
    uint256 private _tokenIds;
    mapping(uint256 => bytes32) public tokenToExtension;  // tokenId => extensionId

    constructor() ERC721("Morphee Extension", "MEXT") {}

    function mintExtension(
        bytes32 extensionId,
        string memory metadataURI,
        uint96 royaltyFee  // e.g., 1000 = 10% royalty
    ) external payable returns (uint256) {
        _tokenIds++;
        uint256 newTokenId = _tokenIds;

        _safeMint(msg.sender, newTokenId);
        _setTokenURI(newTokenId, metadataURI);
        _setTokenRoyalty(newTokenId, msg.sender, royaltyFee);

        tokenToExtension[newTokenId] = extensionId;

        return newTokenId;
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override {
        // Revoke extension license from old owner
        if (from != address(0)) {
            // Emit event for backend to update database
            emit LicenseRevoked(tokenToExtension[tokenId], from);
        }
        // Grant license to new owner
        emit LicenseGranted(tokenToExtension[tokenId], to);
    }
}

Use case:

Developer mints "Math Tutor" as NFT (0.05 ETH)
User A buys NFT (gets extension license)
User A later sells NFT to User B on OpenSea (0.08 ETH)
Developer gets 10% royalty (0.008 ETH) automatically via ERC-2981

5. DAO Governance

Goal: Community governs marketplace rules, fee structure, extension approval.

Governance Token: MORPH

Total supply: 100 million MORPH
Distribution:
- 40% — Community treasury (DAO controlled)
- 30% — Core team (4-year vesting)
- 20% — Early adopters (airdrop to active users)
- 10% — Liquidity mining (staking rewards)

Governance powers:

Set platform fee (currently 20%)
Approve/reject extensions (moderation)
Fund public goods (open-source extensions)
Decide on multi-chain deployment
Treasury management

Voting Mechanism

contract MorpheeDAO {
    struct Proposal {
        string description;
        uint256 votesFor;
        uint256 votesAgainst;
        uint256 deadline;
        bool executed;
        bytes calldata;  // Function call to execute if passed
    }

    mapping(uint256 => Proposal) public proposals;
    uint256 public proposalCount;

    IERC20 public governanceToken;  // MORPH token
    uint256 public quorum = 10_000_000 * 1e18;  // 10M MORPH minimum

    function propose(string memory description, bytes memory calldata_) external returns (uint256) {
        require(governanceToken.balanceOf(msg.sender) >= 100_000 * 1e18, "Need 100k MORPH to propose");

        proposalCount++;
        proposals[proposalCount] = Proposal({
            description: description,
            votesFor: 0,
            votesAgainst: 0,
            deadline: block.timestamp + 7 days,
            executed: false,
            calldata: calldata_
        });

        return proposalCount;
    }

    function vote(uint256 proposalId, bool support) external {
        Proposal storage proposal = proposals[proposalId];
        require(block.timestamp < proposal.deadline, "Voting ended");

        uint256 votingPower = governanceToken.balanceOf(msg.sender);
        if (support) {
            proposal.votesFor += votingPower;
        } else {
            proposal.votesAgainst += votingPower;
        }
    }

    function execute(uint256 proposalId) external {
        Proposal storage proposal = proposals[proposalId];
        require(block.timestamp >= proposal.deadline, "Voting ongoing");
        require(!proposal.executed, "Already executed");
        require(proposal.votesFor + proposal.votesAgainst >= quorum, "Quorum not reached");
        require(proposal.votesFor > proposal.votesAgainst, "Proposal failed");

        proposal.executed = true;

        // Execute proposal (e.g., change platform fee)
        (bool success, ) = address(this).call(proposal.calldata);
        require(success, "Execution failed");
    }
}

API Endpoints

Crypto Payments API

Endpoint	Method	Description
`/api/payments/crypto/price`	GET	Get extension price in crypto (ETH, USDC, BTC)
`/api/payments/crypto/purchase`	POST	Initiate crypto purchase (returns smart contract params)
`/api/payments/crypto/verify`	POST	Verify transaction on-chain, grant license
`/api/payments/crypto/balance`	GET	Get user's prepaid balance for API usage

Web3 Auth API

Endpoint	Method	Description
`/api/auth/web3/nonce`	POST	Generate nonce for wallet signature
`/api/auth/web3/verify`	POST	Verify signature, return JWT
`/api/auth/web3/link`	POST	Link wallet to existing email account

Data Marketplace API

Endpoint	Method	Description
`/api/data/list`	POST	List data for sale (upload to IPFS, create listing)
`/api/data/browse`	GET	Browse available datasets
`/api/data/purchase`	POST	Purchase data (verify on-chain, return decryption key)
`/api/data/download`	GET	Download encrypted data from IPFS

DAO Governance API

Endpoint	Method	Description
`/api/dao/proposals`	GET	List active proposals
`/api/dao/propose`	POST	Create new proposal (requires MORPH tokens)
`/api/dao/vote`	POST	Vote on proposal (signs transaction)

Database Tables

-- Crypto payment tracking
CREATE TABLE crypto_transactions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id),
    tx_hash VARCHAR(66) NOT NULL UNIQUE,  -- Blockchain transaction hash
    chain VARCHAR(20) NOT NULL,  -- "ethereum", "polygon", "base"
    amount_wei NUMERIC(78, 0) NOT NULL,  -- Amount in wei (supports uint256)
    currency VARCHAR(10) NOT NULL,  -- "ETH", "USDC", "DAI"
    purpose VARCHAR(50) NOT NULL,  -- "extension_purchase", "data_purchase", "api_prepaid"
    reference_id UUID,  -- extension_id or listing_id
    status VARCHAR(20) NOT NULL DEFAULT 'pending',  -- pending, confirmed, failed
    confirmations INT DEFAULT 0,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    confirmed_at TIMESTAMPTZ
);

-- Web3 wallet linking
CREATE TABLE user_wallets (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    address VARCHAR(42) NOT NULL UNIQUE,  -- Ethereum address (0x...)
    chain VARCHAR(20) NOT NULL,
    is_primary BOOLEAN DEFAULT false,
    verified_at TIMESTAMPTZ DEFAULT NOW(),
    created_at TIMESTAMPTZ DEFAULT NOW(),

    UNIQUE(user_id, address)
);

-- Data marketplace listings
CREATE TABLE data_listings (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    seller_id UUID NOT NULL REFERENCES users(id),
    title VARCHAR(200) NOT NULL,
    description TEXT,
    data_type VARCHAR(50) NOT NULL,  -- "prompts", "conversations", "model", "memory", "skill"
    ipfs_hash VARCHAR(100) NOT NULL,  -- Encrypted data on IPFS
    metadata_uri TEXT,  -- IPFS URI for preview/description
    price_wei NUMERIC(78, 0) NOT NULL,
    currency VARCHAR(10) NOT NULL,
    smart_contract_listing_id BYTEA,  -- bytes32 from blockchain
    total_sales INT DEFAULT 0,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- Data purchases
CREATE TABLE data_purchases (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    listing_id UUID NOT NULL REFERENCES data_listings(id),
    buyer_id UUID NOT NULL REFERENCES users(id),
    tx_hash VARCHAR(66) NOT NULL,
    price_paid_wei NUMERIC(78, 0) NOT NULL,
    decryption_key_vault VARCHAR(200),  -- vault://data/purchases/{id}
    purchased_at TIMESTAMPTZ DEFAULT NOW(),

    UNIQUE(listing_id, buyer_id)
);

-- DAO proposals (mirror blockchain state)
CREATE TABLE dao_proposals (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    proposal_id_onchain INT NOT NULL UNIQUE,
    proposer_address VARCHAR(42) NOT NULL,
    title VARCHAR(200) NOT NULL,
    description TEXT NOT NULL,
    votes_for NUMERIC(78, 0) DEFAULT 0,
    votes_against NUMERIC(78, 0) DEFAULT 0,
    deadline TIMESTAMPTZ NOT NULL,
    executed BOOLEAN DEFAULT false,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

Effort Estimation

Task	Size	Notes
Smart Contracts: Marketplace + Data + NFT + DAO	L	Solidity development, testing, auditing (critical)
Smart Contract Deployment	M	Deploy to Ethereum, Polygon, Base
Backend: CryptoPaymentService	M	Web3.py integration, event listeners
Backend: Blockchain event indexer	M	Listen for on-chain events, update DB
Backend: IPFS integration	S	Upload/download encrypted data
Frontend: Web3Modal integration	M	Wallet connection, transaction signing
Frontend: Crypto payment UI	M	Extension purchase flow with crypto
Frontend: Data marketplace UI	L	Browse, list, purchase data
Frontend: DAO governance UI	M	Proposals, voting interface
Security audit (smart contracts)	XL	CRITICAL — hire external auditor (Trail of Bits, OpenZeppelin)
Tests: Smart contracts (Hardhat/Foundry)	L	100+ tests for all edge cases
Tests: Backend + Frontend	M	50+ tests for crypto payment flows
Documentation: User guides	M	How to buy with crypto, sell data, vote on DAO

Total: XX-Large (10-12 weeks + 4 weeks security audit)

Risks & Mitigations

Risk	Mitigation
Smart contract bugs (funds lost)	CRITICAL — Extensive testing, formal verification, external audit before mainnet
Gas fee volatility (expensive transactions)	Deploy on L2s (Polygon, Base), offer batch transactions
Crypto price volatility (unstable pricing)	Use stablecoins (USDC, DAI) for subscriptions, ETH for one-time purchases
Regulatory uncertainty (securities laws)	Governance token distribution carefully designed (no ICO, utility-only), legal review
User experience (crypto wallets complex)	Fiat on-ramp (buy crypto with credit card via Stripe → crypto), tutorial videos
Phishing attacks (fake marketplace)	Verify smart contract addresses in UI, wallet warnings, official domains
Data quality disputes (bad datasets)	DAO arbitration, escrow period (7 days), seller reputation system

Future Enhancements

Core Features

Fiat on-ramp — Buy USDC with credit card directly in app (Stripe → Moonpay → USDC)
Subscription automation — Smart contracts auto-renew monthly subscriptions
Multi-sig treasuries — DAO treasury controlled by multi-sig (3-of-5 signers)
Cross-chain bridges — Use LayerZero or Wormhole to bridge assets across chains
Lightning Network — Accept Bitcoin via Lightning for instant, near-zero-fee payments
Reputation system — On-chain reputation for extension developers (NFT badges)
Staking rewards — Stake MORPH tokens to earn % of platform fees
Liquidity mining — Provide liquidity on DEXs (Uniswap) to earn MORPH

ACL & Permission Enhancements

Wallet-Based Permissions (leveraging existing PermissionPolicy):

class WalletPermission(BaseModel):
    wallet_address: str
    can_purchase: bool  # Can buy extensions
    can_sell_data: bool  # Can list data
    can_propose: bool  # Can create DAO proposals
    spending_limit_daily: int  # Max wei spendable per day
    require_approval: bool  # Parent approval for kid's wallet

Use cases:

Family Wallet Management:
- Parent creates wallet for kid (multi-sig: parent + kid)
- Kid can spend max $10/day (spending_limit_daily enforced on-chain)
- Large purchases (>$50) require parent co-signature
- Parent can revoke kid's spending permission anytime
Classroom DAO:
- Teacher creates DAO for class (governance token: CLASS)
- Students vote on which educational extensions to buy
- Class treasury funded by school (multi-sig: teacher + principal)
- Students can propose new extensions, class votes
Enterprise Budgets:
- Manager allocates crypto budget to team (e.g., 10 ETH for Q1)
- Team members can purchase extensions within budget
- All purchases logged on-chain (audit trail)
- Unused budget rolls over or returned to treasury

Smart Contract ACL:

contract WalletACL {
    struct WalletPermissions {
        bool canPurchase;
        bool canSellData;
        uint256 dailySpendingLimitWei;
        address approver;  // Parent or manager who approves
    }

    mapping(address => WalletPermissions) public permissions;

    function setPurchaseLimit(address wallet, uint256 limitWei, address approver) external onlyParent {
        permissions[wallet] = WalletPermissions({
            canPurchase: true,
            canSellData: false,
            dailySpendingLimitWei: limitWei,
            approver: approver
        });
    }

    function checkSpendingLimit(address wallet, uint256 amountWei) external view returns (bool) {
        // Check daily spending (requires indexer to track daily totals)
        uint256 spentToday = getDailySpending(wallet);
        return spentToday + amountWei <= permissions[wallet].dailySpendingLimitWei;
    }
}

Advanced Marketplace Features

Dynamic Pricing (Bonding Curves):

Extension price increases as more people buy (early adopters get discount)
Implemented via bonding curve smart contract: price = basePrice * (1 + totalSales / 100)

Revenue Sharing Automation:

// Referral program: User A refers User B → User B buys extension
// Smart contract automatically splits: 70% dev, 15% Morphee, 10% DAO, 5% referrer
function purchaseExtensionWithReferral(bytes32 extensionId, address referrer) external payable {
    // ... existing purchase logic ...

    if (referrer != address(0) && referrer != msg.sender) {
        uint256 referralFee = (msg.value * 5) / 100;
        payable(referrer).transfer(referralFee);
        emit ReferralPayout(referrer, referralFee);
    }
}

Bundled Purchases:

Buy "Education Bundle" (3 extensions) at 20% discount
Smart contract mints bundle NFT, grants licenses for all 3 extensions

Fractional Ownership:

Expensive extensions (e.g., $1000 enterprise tool) split into 100 shares
Users buy shares (0.01 ETH each), share revenue proportionally
Implemented via ERC-1155 (multi-token standard)

Data Marketplace Enhancements

Verified Data Labels:

Data passes quality checks → gets "Verified" badge (NFT badge)
Morphee AI reviews dataset quality, anonymization compliance
Verified data commands 2x higher prices

Data Escrow:

Buyer pays → funds held in escrow for 7 days
If data quality issue → buyer disputes → DAO arbitrates
If no dispute → seller receives funds after 7 days

Anonymization Pipeline:

class DataAnonymizer:
    async def anonymize_conversations(self, messages: list[Message]) -> bytes:
        """Remove PII, hash user IDs, generalize locations."""
        anonymized = []
        for msg in messages:
            content = self.remove_pii(msg.content)  # NER model detects names, emails, addresses
            user_hash = hashlib.sha256(msg.user_id.encode()).hexdigest()[:8]
            anonymized.append({
                "user": user_hash,
                "role": msg.role,
                "content": content,
                "timestamp": msg.created_at.strftime("%Y-%m-%d"),  # Date only, no time
            })
        return json.dumps(anonymized, ensure_ascii=False).encode()

AI Model Marketplace:

Sell fine-tuned LoRA adapters for specific domains
Buyer downloads model, verifies via hash, loads into Morphee
Revenue split: 80% trainer, 20% DAO

DAO Governance Enhancements

Quadratic Voting:

Prevent whale dominance: voting power = sqrt(token_balance)
1M MORPH → 1000 votes (not 1M votes)

Conviction Voting:

Stake tokens on proposal → voting power increases over time
Encourages long-term alignment, discourages vote-flipping

Delegated Voting:

Token holders delegate voting power to trusted experts
Expert votes on behalf of delegators, maximizes participation

Treasury Diversification:

DAO treasury holds ETH, USDC, DAI (not just MORPH)
Reduces volatility risk, ensures operational stability

On-Chain Execution:

Proposals include executable code (e.g., "setPlatformFee(15)")
If proposal passes → smart contract auto-executes
No manual intervention (trustless)

Privacy & Security

Private Transactions (ZK-SNARKs):

Hide transaction amounts using zero-knowledge proofs
Users prove they paid correct amount without revealing amount
Implemented via zkSync or Aztec Protocol

Data Encryption (Threshold Encryption):

Data encrypted with threshold scheme (3-of-5 keys needed to decrypt)
Prevents single point of failure (if 1 key lost, still accessible)

Audit Trail:

All marketplace transactions logged on-chain (immutable)
Users can prove purchase history for tax/accounting
GDPR compliant: user can request on-chain data export

Last Updated: February 13, 2026

Overview​

Motivation​

Use Cases​

Architecture​

1. Crypto Payment Integration​

Supported Cryptocurrencies​

Payment Flow (Extension Purchase)​

Smart Contract: ExtensionMarketplace​

Backend: CryptoPaymentService​

2. Web3 Wallet Integration​

Frontend: Web3 Provider​

Wallet-Based Authentication​

3. Data Marketplace​

Data Types​

Smart Contract: DataMarketplace​

Data Encryption & Access Control​

4. NFT Extensions​

ERC-721 Extension NFTs​

5. DAO Governance​

Governance Token: MORPH​

Voting Mechanism​

API Endpoints​

Crypto Payments API​

Web3 Auth API​

Data Marketplace API​

DAO Governance API​

Database Tables​

Effort Estimation​

Risks & Mitigations​

Future Enhancements​

Core Features​

ACL & Permission Enhancements​

Advanced Marketplace Features​

Data Marketplace Enhancements​

DAO Governance Enhancements​

Privacy & Security​