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Cross-Chain Bridge Configuration Guide

Date: 2025-12-11 Status: Ready for Configuration

🌉 Bridge Overview

Each chain has two CCIP bridges deployed:

CCIPWETH9Bridge: For WETH9 cross-chain transfers
CCIPWETH10Bridge: For WETH10 cross-chain transfers

📋 Deployed Bridges by Chain

BSC (Chain ID: 56)

CCIPWETH9Bridge: 0x8078a09637e47fa5ed34f626046ea2094a5cde5e
CCIPWETH10Bridge: 0x105f8a15b819948a89153505762444ee9f324684

Polygon (Chain ID: 137)

CCIPWETH9Bridge: 0xa780ef19a041745d353c9432f2a7f5a241335ffe
CCIPWETH10Bridge: 0xdab0591e5e89295ffad75a71dcfc30c5625c4fa2

Avalanche (Chain ID: 43114)

CCIPWETH9Bridge: 0x8078a09637e47fa5ed34f626046ea2094a5cde5e
CCIPWETH10Bridge: 0x105f8a15b819948a89153505762444ee9f324684

Base (Chain ID: 8453)

CCIPWETH9Bridge: 0x8078a09637e47fa5ed34f626046ea2094a5cde5e
CCIPWETH10BRIDGE: 0x105f8a15b819948a89153505762444ee9f324684

Arbitrum (Chain ID: 42161)

CCIPWETH9Bridge: 0x8078a09637e47fa5ed34f626046ea2094a5cde5e
CCIPWETH10Bridge: 0x105f8a15b819948a89153505762444ee9f324684

Optimism (Chain ID: 10)

CCIPWETH9Bridge: 0x8078a09637e47fa5ed34f626046ea2094a5cde5e
CCIPWETH10Bridge: 0x105f8a15b819948a89153505762444ee9f324684

⚙️ Configuration Steps

1. Set Destination Chains

For each bridge, configure destination chain selectors:

// Example: Configure BSC bridge to send to Polygon
bridge.setDestinationChain(
    POLYGON_SELECTOR,  // 4051577828743386545
    polygonBridgeAddress
);

2. Fund Bridges with LINK

Each bridge needs LINK tokens for CCIP fees:

# Transfer LINK to bridge
cast send $LINK_TOKEN \
  "transfer(address,uint256)" \
  $BRIDGE_ADDRESS \
  $AMOUNT \
  --rpc-url $RPC_URL \
  --private-key $PRIVATE_KEY

Recommended: 10 LINK per bridge for initial operations

3. Enable Bridges

Enable bridges for cross-chain operations:

bridge.enable();

4. Set Fee Configuration

Configure fee parameters if needed:

bridge.setFeeConfig(...);

🔗 Chain Selectors Reference

Chain	Chain Selector
Ethereum Mainnet	5009297550715157269
BSC	11344663589394136015
Polygon	4051577828743386545
Avalanche	6433500567565415381
Base	15971525489660198786
Arbitrum	4949039107694359620
Optimism	3734403246176062136
Cronos	TBD
Gnosis Chain	465200170687744372
Celo	1346049177634351622
Wemix	5142893604156789321
Chain-138	TBD

📝 Configuration Scripts

Example: Configure BSC → Polygon Bridge

# Set Polygon as destination for BSC WETH9 bridge
cast send $CCIPWETH9BRIDGE_BSC \
  "setDestinationChain(uint64,address)" \
  4051577828743386545 \
  $CCIPWETH9BRIDGE_POLYGON \
  --rpc-url $BSC_RPC_URL \
  --private-key $PRIVATE_KEY

# Fund bridge with LINK
cast send $CCIP_BSC_LINK_TOKEN \
  "transfer(address,uint256)" \
  $CCIPWETH9BRIDGE_BSC \
  10000000000000000000 \
  --rpc-url $BSC_RPC_URL \
  --private-key $PRIVATE_KEY

# Enable bridge
cast send $CCIPWETH9BRIDGE_BSC \
  "enable()" \
  --rpc-url $BSC_RPC_URL \
  --private-key $PRIVATE_KEY

🧪 Testing Bridge Configuration

Test Cross-Chain Transfer

# On source chain: Lock and send
cast send $CCIPWETH9BRIDGE_BSC \
  "lockAndSend(uint256,uint64)" \
  $AMOUNT \
  4051577828743386545 \
  --rpc-url $BSC_RPC_URL \
  --private-key $PRIVATE_KEY

# On destination chain: Check for received message
# (CCIP will automatically deliver)

⚠️ Important Notes

LINK Tokens: Ensure bridges have sufficient LINK for CCIP fees
Chain Selectors: Use correct selectors from CCIP documentation
Gas Limits: Set appropriate gas limits for cross-chain messages
Security: Verify all destination addresses before enabling
Testing: Test with small amounts first

📚 Additional Resources

Last Updated: 2025-12-11

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