BaseBuilder DeFi Optimal Bridge Gas Estimator

Use this endpoint when you need to determine the most cost-efficient bridge route and gas price for a cross-chain token transfer on Base and EVM-compatible chains; particularly useful before executing a bridge transaction to avoid overpaying on gas or choosing a suboptimal protocol

• Unsupported source or destination chain returns 400 with invalid chain error
• Unsupported token pair returns 400 with unsupported asset error
• Amount too small for bridging returns 400 with minimum amount error
• Network congestion causing stale gas data returns 503
• Payment not received or insufficient USDC returns 402 payment required
• Rate limiting if too many requests returns 429