Supported Chains

Brtr supports four active testnets for trustless OTC settlement.

Current Networks

Testnets (Live Now)

Base Sepo

✓ Active

Chain ID: 84532

LayerZero EID: 40245

Native Token: ETH

Explorer: sepolia.basescan.org (opens in a new tab)

OP Sepo

✓ Active

Chain ID: 11155420

LayerZero EID: 40232

Native Token: ETH

Explorer: sepolia-optimism.etherscan.io (opens in a new tab)

Monad Testnet

✓ Active

Chain ID: 10143

LayerZero EID: 40362

Native Token: MON

Explorer: testnet.monadexplorer.com (opens in a new tab)

M

MegaETH

✓ Active

Chain ID: TBD

LayerZero EID: TBD

Native Token: ETH

Explorer: TBD

Mainnets (Coming Soon)

LayerZero Integration

Brtr uses LayerZero (opens in a new tab) for cross-chain messaging. Each chain has a unique Endpoint ID (EID) used for routing messages.

How Cross-Chain Works

Chain A (Buyer)                    Chain B (Seller)
      │                                   │
      │  1. Fill Order                    │
      │  (escrow buyer tokens)            │
      │                                   │
      │──────── FILL_INITIATE ───────────>│
      │        (LayerZero msg)            │
      │                                   │  2. Lock seller tokens
      │                                   │
      │<─────── FILL_CONFIRMATION ────────│
      │        (LayerZero msg)            │
      │                                   │
      │  3. Release buyer tokens          │
      │     to seller                     │
      │                                   │
      │──────── FILL_FINALIZATION ───────>│
      │        (LayerZero msg)            │
      │                                   │  4. Release seller tokens
      │                                   │     to buyer
      ▼                                   ▼
   Trade Complete!                   Trade Complete!

Chain Selection Guide

For Order Creators (Sellers)

Consider these factors when choosing where to create your order:

• Gas costs — Some chains have lower fees
• Token availability — Where is your token most liquid?
• Target audience — Where are potential buyers?

For Order Fillers (Buyers)

When filling cross-chain orders:

• You pay gas on YOUR chain
• The seller pays gas on THEIR chain (via gas drop)
• Cross-chain trades take 2-5 minutes

Adding New Chains

Want Brtr on your favorite chain? We evaluate new chain integrations based on:

1. LayerZero support — The chain must have a LayerZero endpoint
2. Community demand — User and trading volume expectations
3. Security — Chain stability and smart contract support
4. Technical compatibility — EVM compatibility required

Request a new chain in our Discord (opens in a new tab) or GitHub discussions (opens in a new tab).