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Overview

TomoX is Viction’s decentralized exchange protocol that enables permissionless and trustless token trading directly on the blockchain. It provides a secure, efficient orderbook-based trading system integrated at the protocol level.

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Key Features

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On-Chain Order Matching

TomoX processes all orders on-chain through the trading state database, ensuring transparency and security:
  • Order Processing: Orders are matched and executed in blocks
  • State Management: Trading state is maintained in a dedicated state trie
  • Transaction Finality: All trades benefit from Viction’s 2-second block time

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Relayer Network

Relayers operate decentralized exchanges by:
  • Maintaining order books for trading pairs
  • Collecting trade fees (0-10% configurable)
  • Providing user interfaces and APIs
  • Depositing collateral to ensure honest operation

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Architecture

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Trading State Database

The TomoX protocol maintains a separate state database for trading operations: 
type TomoX struct {
    db         tomoxDAO.TomoXDAO
    StateCache tradingstate.Database
    orderNonce map[common.Address]*big.Int
    Triegc     *prque.Prque
}
Source: tomox/tomox.go:52

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Order Structure

Orders contain all necessary information for matching: 
type OrderItem struct {
    Nonce           *big.Int
    Quantity        *big.Int
    Price           *big.Int
    ExchangeAddress common.Address
    UserAddress     common.Address
    BaseToken       common.Address
    QuoteToken      common.Address
    Status          string
    Side            string  // "BUY" or "SELL"
    Type            string  // "LIMIT" or "MARKET"
    Hash            common.Hash
    OrderID         uint64
    Signature       *Signature
}
Source: tomox/order_processor.go

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Order Processing Flow

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1. Order Submission

Users submit signed order transactions to the network:
  • Orders are signed with the user’s private key
  • Each order has a unique nonce to prevent replay attacks
  • Orders enter the pending transaction pool

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2. Order Matching

The protocol matches orders during block processing: 
func (tomox *TomoX) ProcessOrderPending(
    header *types.Header,
    coinbase common.Address,
    chain consensus.ChainContext,
    pending map[common.Address]types.OrderTransactions,
    statedb *state.StateDB,
    tomoXstatedb *tradingstate.TradingStateDB,
) ([]tradingstate.TxDataMatch, map[common.Hash]tradingstate.MatchingResult)
Source: tomox/tomox.go:157

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3. Trade Execution

When orders match:
  • Tokens are transferred between buyer and seller
  • Trade fees are collected by the relayer
  • Order status is updated (Filled, PartialFilled, or Rejected)
  • Trade records are stored on-chain

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Order Types

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Limit Orders

Execute at a specific price or better:
  • Remain in the order book until filled or cancelled
  • Can be partially filled
  • Status: Open → PartialFilled → Filled

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Market Orders

Execute immediately at the best available price:
  • Filled against existing limit orders
  • May result in multiple trades at different prices
  • Status: Filled or Rejected if no liquidity

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Price Discovery

TomoX maintains price information for trading pairs: 
// Get average price from last epoch
func (tomox *TomoX) GetAveragePriceLastEpoch(
    chain consensus.ChainContext,
    statedb *state.StateDB,
    tradingStateDb *tradingstate.TradingStateDB,
    baseToken common.Address,
    quoteToken common.Address,
) (*big.Int, error)
Source: tomox/tomox.go:267 Prices are tracked per epoch and used for:
  • Collateral valuation in TomoX Lending
  • Fee calculations
  • Token conversions

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Relayer Registration

To operate a relayer, you must register through the smart contract:

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Registration Contract

contract RelayerRegistration {
    struct Relayer {
        uint256 _deposit;
        uint16 _tradeFee;
        address[] _fromTokens;
        address[] _toTokens;
        uint _index;
        address _owner;
    }

    function register(
        address coinbase,
        uint16 tradeFee,
        address[] memory fromTokens,
        address[] memory toTokens
    ) public payable;
}
Source: contracts/tomox/contract/Registration.sol:9

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Requirements

  • Minimum Deposit: Collateral in VIC tokens
  • Trade Fee: 0-10% (0-1000 basis points)
  • Token Pairs: Must include TOMO pairs for price discovery
  • Maximum Pairs: Configurable limit per relayer

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Managing a Relayer

Relayer owners can:
  • Update: Change trading pairs and fees
  • Deposit More: Increase collateral
  • Transfer: Change ownership
  • Resign: Request to close (4-week waiting period)
  • Refund: Withdraw collateral after resignation period

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SDK Node Integration

SDK nodes provide enhanced functionality for relayers: 
func (tomox *TomoX) SyncDataToSDKNode(
    takerOrderInTx *tradingstate.OrderItem,
    txHash common.Hash,
    txMatchTime time.Time,
    statedb *state.StateDB,
    trades []map[string]string,
    rejectedOrders []*tradingstate.OrderItem,
    dirtyOrderCount *uint64,
) error
Source: tomox/tomox.go:317 SDK nodes use MongoDB to provide:
  • Real-time order book data
  • Trade history
  • Order status tracking
  • API endpoints for frontend applications

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API Access

The TomoX RPC API provides protocol information: 
type PublicTomoXAPI struct {
    t        *TomoX
    mu       sync.Mutex
    lastUsed map[string]time.Time
}

func (api *PublicTomoXAPI) Version(ctx context.Context) string {
    return ProtocolVersionStr // "1.0"
}
Source: tomox/api.go:23

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Order Book Structure

Order books are identified by trading pair hashes:
  • Base Token: The token being traded (e.g., BTC)
  • Quote Token: The token used for pricing (e.g., VIC)
  • Order Book Hash: Keccak256(baseToken + quoteToken)
Each order book maintains:
  • Buy orders (bids) sorted by price descending
  • Sell orders (asks) sorted by price ascending
  • Price-time priority matching

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Token Listing

Before trading, tokens must be listed: 
contract TOMOXListing {
    function apply(address token) public payable {
        require(msg.value == 1000 ether);
        foundation.transfer(msg.value);
        
        _tokens.push(token);
        tokensState[token] = TokenState({
            isActive: true
        });
    }
}
Source: contracts/tomox/contract/TOMOXListing.sol:27 Listing Fee: 1000 VIC (transferred to foundation)

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Performance

  • Block Time: 2 seconds
  • Maximum Orders per Block: 1000
  • Order Matching: O(n log n) for price-time priority
  • State Updates: Optimized with caching (1024 entry LRU cache)
TomoX is integrated at the protocol level, not as a smart contract. This provides:
  • Lower gas costs (orders don’t execute EVM bytecode)
  • Faster execution (native code in the consensus layer)
  • Better security (no smart contract vulnerabilities)
  • Direct state access without contract overhead
Orders and trades are stored in the blockchain state, not on the relayer. If a relayer goes offline:
  • Your orders remain in the protocol state
  • You can cancel orders directly through another interface
  • Your funds are never held by the relayer
  • You can access your trading history through any SDK node
All trades are executed on-chain with cryptographic signatures:
  • Every order is signed by the user’s private key
  • All matching logic is deterministic and verifiable
  • Trade execution is part of consensus
  • No disputes are possible as everything is cryptographically provable
Yes, anyone can run a relayer by:
  1. Meeting the minimum deposit requirement
  2. Registering through the RelayerRegistration contract
  3. Running relayer software (frontend + SDK node)
  4. Configuring trading pairs and fees
You don’t need permission and you control your relayer completely.

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See Also

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