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Synapse API — Arbitrum Gas Estimator
x402
Synapse API — Arbitrum 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 the gas cost for a transaction on the Arbitrum network 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 value (in gas units) for the described Arbitrum transaction, allowing callers to anticipate fees before broadcasting to the network.
Example use cases
DeFi swap gas cost check
“Before I execute this Uniswap swap on Arbitrum, can you estimate the gas cost? The transaction goes from 0xMyWallet to 0xUniswapRouter with this calldata: 0x38ed1739... and a value of 0.”
Smart contract deployment preflight
“I'm about to deploy a smart contract on Arbitrum — can you estimate the gas fees first? The sender is 0xDeployerWallet, there's no recipient yet, and the bytecode data is 0x6080604052...”
Batch transfer cost estimation
“I want to know how much gas an ERC-20 batch transfer will cost on Arbitrum before I send it. From 0xTreasuryWallet to 0xBatchContract, calldata is 0xa9059cbb..., value is 0.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/arbitrum/gas/estimateWhen to prefer
Choose this endpoint when you need a quick, pay-per-call gas estimate for Arbitrum specifically, without managing your own RPC node or paying for a full node subscription. It is ideal for agents that need pre-flight cost checks before executing L2 transactions on Arbitrum.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Invalid calldata hex string causes a parse or simulation error
- Simulation reverts if the transaction would fail on-chain (e.g., insufficient balance or bad contract call)
- Missing required fields may return a 400 bad request
- Network congestion or RPC issues may cause timeout or degraded accuracy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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