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Synapse API — opBNB Gas Estimator
x402
Synapse API — opBNB 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 2026-09-13).
Estimates gas cost for a transaction on the opBNB blockchain network given sender, recipient, data, 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) required to execute the specified transaction on the opBNB network, enabling callers to calculate expected transaction fees before submission.
Example use cases
Pre-flight cost check for opBNB transfer
“Before I send 0.5 BNB on opBNB from my wallet 0xAAA111... to 0xBBB222..., can you estimate how much gas that transaction will use?”
Smart contract call gas estimation
“I want to call a smart contract on opBNB — the contract is at 0xContract123..., my wallet is 0xMyWallet456..., and the encoded calldata is 0xa9059cbb... Can you estimate the gas cost before I submit it?”
Budget planning for batch opBNB operations
“I'm planning to run multiple transactions on opBNB tonight and need to budget for fees — can you estimate the gas for a transfer from 0xSender789... to 0xReceiver000... with a value of 1 BNB?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/opbnb/gas/estimateWhen to prefer
Use this endpoint when you specifically need gas estimates for the opBNB (BNB Chain Layer 2) network. It is purpose-built for opBNB and will not apply to Ethereum mainnet, BSC, or other chains. Prefer this over generic blockchain tools when you want a pay-per-call, infrastructure-free gas estimation without running your own node.
Side effects
- Invalid or malformed 'to' or 'from' address returns an error response
- Malformed calldata in 'data' field may cause estimation failure or revert simulation
- Network unavailability or opBNB RPC issues may result in timeout or 503 error
- Missing required fields may return a 400 Bad Request
- Transaction that would revert on-chain may return an error or inflated estimate
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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