Technical Feasibility

Context

MUWP from MuwPay aims to facilitate multitoken cross-chain token swaps, leveraging Stellar's ecosystem for its fast transactions and low fees. The integration involves using both decentralized exchanges (DEXes) native to Stellar, like StellarX and StellarTerm, as well as external platforms like Changelly for broader asset availability and bridges such as Allbridge for accessing non-native tokens.

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1. Smart Contract Development Using Soroban

Purpose: Develop and deploy Soroban smart contracts to handle complex operations like route optimization and token swaps.

SwapContract (Rust)

#[contract]
pub trait SwapContract {
    fn execute_swap(&self, env: Env, from_token: symbol, to_token: symbol, amount: BigInt);
}

pub trait PriceFeedContract {
    fn get_price(&self, env: Env, token: symbol) -> BigInt;
}

pub struct SwapImpl;

#[contractimpl]
impl SwapContract for SwapImpl {
    fn execute_swap(&self, env: Env, from_token: symbol, to_token: symbol, amount: BigInt) {
        let price_feed_contract: PriceFeedContractClient = env.get_contract("price_feed_contract_address");
        let from_price = price_feed_contract.get_price(env.clone(), from_token);
        let to_price = price_feed_contract.get_price(env.clone(), to_token);

        // Logic to calculate the best swap route based on the prices
        // Further processing and executing the swap on the Stellar network
    }
}

How it works:

• SwapContract — defines execute_swap(env, from_token, to_token, amount).
• PriceFeedContract — defines get_price(env, token) -> BigInt to retrieve current prices.
• SwapImpl — implements SwapContract, calls PriceFeedContract for both tokens, then calculates the optimal route and executes the swap.

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2. Cross-Contract Calls

Purpose: Leverage Soroban's capability to interact with other contracts for liquidity checks.

LiquidityContract + TradingContract

pub trait LiquidityContract {
    fn add_liquidity(&self, env: Env, token_a: symbol, token_b: symbol, amount_a: BigInt, amount_b: BigInt);
}

pub struct LiquidityImpl;

#[contractimpl]
impl LiquidityContract for LiquidityImpl {
    fn add_liquidity(&self, env: Env, token_a: symbol, token_b: symbol, amount_a: BigInt, amount_b: BigInt) {
        // Implementation: add tokens/amounts to the designated liquidity pool
    }
}

pub trait TradingContract {
    fn execute_trade(&self, env: Env, token_a: symbol, token_b: symbol, amount: BigInt);
}

pub struct TradeImpl;

#[contractimpl]
impl TradingContract for TradeImpl {
    fn execute_trade(&self, env: Env, token_a: symbol, token_b: symbol, amount: BigInt) {
        let liquidity_contract: LiquidityContractClient = env.get_contract("liquidity_contract_address");
        let required_liquidity = liquidity_contract.add_liquidity(env.clone(), token_a, token_b, amount, amount);

        // Additional trading logic after liquidity is ensured
    }
}

The TradingContract first ensures liquidity via LiquidityContract before executing a trade — a cross-contract call pattern that keeps concerns separated.

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3. Integration with DEXes and Bridges

• DEXes: Directly integrate with Stellar DEXes (StellarX, StellarTerm) through their APIs.
• Bridges: Use Allbridge and similar services for swaps involving non-Stellar tokens.

Stellar Elements Required

Element	Purpose
Horizon API	Transaction submission, account monitoring
Stellar Core	Consensus and ledger participation

Platforms

Platform	Role
Allbridge	Cross-chain bridging for non-Stellar assets
StellarX / StellarTerm	Native Stellar DEX trading
Defispot	DEX aggregator for best rates
Changelly	Fast cross-chain exchanges

Integration Strategy

1. API Integration — Connect to each platform's API for quotes and execution.
2. Unified Interface — A single user interface presenting the best routes across all platforms.
3. Automated Routing — Soroban smart contracts select the most efficient route in real-time, with fallbacks if a service is unavailable.
4. Security — Stringent security protocols for all external API interactions.
5. Performance Optimization — Monitor APIs and smart contracts to reduce slippage and transaction fees.
6. Continuous Monitoring — Track operational status and updates from integrated DEXes and bridges.

Benefits

• Comprehensive Coverage: Users access a wide range of services across multiple blockchains.
• Optimization of Swaps: Automated calculations ensure users get the best possible rates.
• Enhanced User Experience: A streamlined interface that simplifies complex blockchain interactions.

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Conclusion

The integration of MUWP with Stellar using Soroban smart contracts and cross-contract calls enables efficient, secure, and versatile cross-chain token swaps. This approach leverages Stellar's transactional efficiencies while enhancing user experience by providing diverse route and token swap options.