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Synapse API — Base Gas Estimation
x402
Synapse API — Base Gas Estimation is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-24).
Estimates the gas cost for a transaction on the Base blockchain network given transaction parameters
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns an estimated gas amount (in gas units) required to execute the described transaction on the Base network. This allows callers to budget for transaction fees before submission, check affordability, and avoid failed transactions due to insufficient gas.
Example use cases
Pre-flight gas check before DeFi trade
“Before I submit this swap on Base, can you estimate the gas cost? The transaction is from 0xMyWallet to 0xUniswapRouter with this calldata: 0xabc123... and I'm sending 0 ETH value.”
Smart contract deployment cost estimate
“I want to deploy a contract on Base — can you estimate the gas needed? The deploying address is 0xDev123, the compiled bytecode is 0x6080604052..., and the value is 0.”
NFT mint gas estimation
“How much gas will it cost to mint an NFT on Base? The minting contract is at 0xNFTContract, I'm calling from 0xMyAddress, and the mint function data is 0xd85d3d27.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/base/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a gas estimate specifically for the Base (Coinbase L2) network before submitting a transaction. Prefer this over generic gas estimators when working within the Base ecosystem, especially for smart contract interactions, token transfers, or NFT mints on Base. It is best used as a pre-submission check to avoid wasted fees or failed transactions.
Side effects
- Invalid or malformed Ethereum address in 'to' or 'from' fields returns an error
- Malformed or non-hex 'data' field causes estimation failure
- Estimation may fail if the simulated transaction would revert on-chain
- Network unavailability or RPC errors from the Base node can return 5xx responses
- Missing required fields may return a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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