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BaseBuilder DeFi Bridge Fees
x402
BaseBuilder DeFi Bridge Fees is a paid API for AI agents from bbx-defi.vercel.app, paid per call via x402, $0.122869/call, status unknown (last checked 2026-10-12).
Returns estimated bridge fees for cross-chain token transfers in DeFi
Price / call$0.122869
Success—
StatusUnknown
How this service works
BaseBuilder Defi API hub - 22 paid endpoints
Output
Returns a fee estimate for a cross-chain bridge transfer, typically including total fee amount, breakdown of gas costs vs protocol fees, and the token/chain context used for the calculation.
Example use cases
Pre-bridge cost estimation
“Before I bridge my 2000 USDC from Arbitrum to Base, can you check what the total bridge fees would be so I know what to expect?”
Cheapest chain route comparison
“I want to move ETH to Optimism — can you get me the current bridge fee estimate so I can decide if it's worth doing now or waiting?”
DeFi bot fee budgeting
“Get me the bridge fee estimate for transferring 10000 USDC from Ethereum to Base so my trading bot can calculate if the arbitrage is still profitable after fees.”
Technical details
Endpoint
POSThttps://bbx-defi.vercel.app/api/bridge/fees?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick fee quote before initiating a cross-chain token bridge operation, particularly for routes involving Base chain. Prefer this over on-chain calls when you want a pre-computed estimate without requiring wallet connectivity.
Side effects
- Unsupported source or destination chain returns an error or empty result
- Invalid or unsupported token address causes a 400 error
- Network congestion may cause stale or unavailable gas price data
- Payment not received (402) if x402 payment header is missing or insufficient
- Service downtime on Vercel deployment may cause 503 errors
Tags
x402
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