Building Production Cross-Chain Intent...

Introduction: The Future of Cross-Chain Intent Settlements

The blockchain landscape is rapidly evolving beyond simple token transfers. Users now demand seamless, intent-based interactions across multiple chains without the complexity of managing bridges, gas tokens, and finality assumptions.

Enter NEAR Intents � a revolutionary protocol that enables users to express high-level intents ("swap USDC on NEAR for ETH on Ethereum") and have them executed atomically across chains using Multi-Party Computation (MPC) for secure threshold signatures.

Why MPC Bridges Matter

Traditional bridges rely on:

Single points of failure (multisig, single relayer)

Trust assumptions (honest majority, honest minority)

Slow finality (waiting for L1 confirmations)

NEAR Intents MPC Bridge changes this with:

2-of-3 threshold signatures � no single party controls funds

Permissionless relayers � censorship resistance

Intent-based UX � users express *what*, not *how*

Architecture Overview

```

User Intent ? IntentRouter ? MPCEscrow (MPC signing) ? OmniBridge ? Target Chain

```

Core Components

1. MPCEscrow.sol � Manages intent lifecycle, collects MPC signatures, executes settlement

2. IntentRouter.sol � Routes intents to handlers, manages fees (0.3% for bridges)

3. OmniBridge.sol � Cross-chain messaging to Ethereum (Rainbow Bridge) & Bitcoin (NEAR BTC Bridge)

Supported Intent Types

| Type | Fee | Use Case |

|------|-----|----------|

| Bridge | 30 bps | Cross-chain transfers |

| Swap | 25 bps | DEX swaps |

| Stake | 10 bps | Staking |

| Lend | 15 bps | Lending |

| Borrow | 20 bps | Borrowing |

| Governance | 0 | DAO voting |

Production-Ready SDKs

TypeScript

```typescript

import { NearIntentsClient, IntentBuilder } from "@bt13/near-intents-sdk";

const client = new NearIntentsClient({

network: "testnet",

mpcNodes: ["mpc1.near.org", "mpc2.near.org", "mpc3.near.org"],

signer: mySigner

});

const intent = new IntentBuilder()

.bridge({ from: "NEAR", to: "ETHEREUM", asset: "USDC", amount: 1000_000_000n })

.setRecipient("0x...")

.build();

const result = await client.submitIntent(intent);

```

Python

```python

from near_intents import NearIntentsClient, IntentBuilder

client = NearIntentsClient(

network="testnet",

mpc_nodes=["mpc1.near.org", "mpc2.near.org", "mpc3.near.org"],

signer=my_signer

)

intent = IntentBuilder()\n .bridge(from_chain="NEAR", to_chain="ETHEREUM", asset="USDC", amount=1000000000)\n .set_recipient("0x...")\n .build()

result = await client.submit_intent(intent)

```

Bridge UI (React + TypeScript)

A production-ready frontend with:

Intent creation wizard (chain selector, asset picker, amount input)

MPC progress tracking (real-time signature collection)

Transaction history (with Etherscan/NEAR Explorer links)

Wallet connection (NEAR Wallet, MetaMask, WalletConnect)

Security & Audits

Smart contracts audited (MPCEscrow, IntentRouter, OmniBridge)

2-of-3 MPC threshold with identifiable abort

ReentrancyGuard on all entry points

Emergency pause via multisig

Formal verification of invariant: `totalEscrowed >= totalSettled`

Deployment

```bash

Testnet

./scripts/deploy-foundry.sh testnet

Mainnet (requires multisig)

forge create ... --dry-run > calldata.json

```

Get Started

NEAR Intents MPC Bridge Integration Kit

$99.00

---

*Built by BT13 Security � 59+ vulnerabilities found across Layer3, NEAR, DeFi. MIT license, commercial use permitted.*

Building Production Cross-Chain Intent Settlement with NEAR MPC Bridge