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Synapse API — Optimism Gas Estimator
x402
Synapse API — Optimism 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 costs for a transaction on the Optimism (OP Mainnet) blockchain given sender, recipient, calldata, and value.
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) needed to execute the specified transaction on Optimism, helping callers budget fees before submitting the transaction on-chain.
Example use cases
Pre-flight cost check for ETH transfer
“Before I send 1 ETH to 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Optimism from my wallet 0xAbCd1234..., can you estimate how much gas I'll need?”
Smart contract call cost estimation
“I want to call a smart contract on Optimism — the contract is at 0xDeFg5678... and the encoded calldata is 0xa9059cbb0000.... Can you estimate the gas cost before I submit the transaction?”
DeFi swap gas budgeting
“I'm planning a token swap on Optimism from address 0x1111... to DEX contract 0x2222... with calldata 0x38ed1739... and value 0. What's the estimated gas I should budget for this?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/optimism/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate specifically for the Optimism (OP Mainnet) L2 network without running your own node. It is preferable when you want a lightweight, pre-submission cost check for ETH transfers or contract calls on Optimism and don't need a full node setup or SDK integration.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns a 4xx error
- Invalid hex calldata in 'data' field causes a parsing error
- Optimism node unavailability results in a 5xx or timeout
- Insufficient or missing required fields may return a validation error
- Transaction simulation reverts (e.g. contract call would fail) may return an error or revert reason
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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