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Synapse API — Robinhood Gas Estimator
x402
Synapse API — Robinhood Gas Estimator 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 2026-09-15).
Estimates gas fees for an EVM transaction given sender, recipient, calldata, and value fields
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 a computed gas estimate (in gas units) for the described EVM transaction, allowing the caller to predict fees and set appropriate gas limits before broadcasting on-chain.
Example use cases
Pre-flight DeFi swap cost check
“Before I execute this Uniswap swap, estimate the gas cost for the transaction from 0xSenderAddress to 0xUniswapRouter with this calldata: 0xabc123... and a value of 0 ETH — I want to know the fee upfront.”
NFT mint gas estimation
“I'm about to mint an NFT — can you estimate how much gas I'll need for a call from my wallet 0xMyWallet to the contract 0xNFTContract with this mint calldata: 0xdeadbeef and no ETH value attached?”
Safe transaction budget planning
“I need to plan my gas budget for sending 1 ETH from 0xTreasury to 0xRecipient — can you estimate the gas required so I can set an appropriate gas limit before broadcasting?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/robinhood/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for an EVM transaction without running your own node or RPC infrastructure. Ideal for agents automating blockchain interactions that need to budget gas costs before submitting transactions, especially when you want a simple REST API interface rather than direct RPC eth_estimateGas calls.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed or non-hex 'data' field causes parsing failure
- Network unavailability or RPC node timeout may produce errors or stale estimates
- Missing required fields may return a validation error
- Gas estimation may fail if the simulated transaction would revert on-chain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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