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Synapse API — Katana Gas Estimator
x402
Synapse API — Katana 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 the gas required for a transaction on the Katana blockchain 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 a gas estimate (in gas units) for the described transaction on the Katana network, allowing callers to budget fees and set appropriate gas limits before broadcasting a transaction.
Example use cases
Pre-flight contract call check
“Before I send this ERC-20 transfer on Katana, estimate the gas cost — from 0x1111...aaaa to 0x2222...bbbb with calldata 0xa9059cbb000000000000000000000000 and zero ETH value.”
DeFi swap gas budgeting
“I want to know how much gas a Uniswap swap call will consume on Katana — the from address is 0xAAA...111, the router contract is 0xBBB...222, and here's the encoded swap calldata: 0x38ed1739...”
Smart contract deployment cost estimate
“Estimate the gas needed to deploy this contract on Katana — from my deployer wallet 0xDEAD...BEEF, no recipient address, and here's the contract bytecode as the data field.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/katana/gas/estimateWhen to prefer
Use this endpoint when you need a gas estimate specifically for the Katana blockchain network before submitting a transaction. Prefer this over generic Ethereum gas estimators when targeting Katana, and use it as a pre-flight check to avoid out-of-gas failures or to surface revert conditions before broadcasting.
Side effects
- Invalid or malformed address in 'from' or 'to' fields returns an error
- Malformed or non-hex 'data' field causes a parse error
- Transaction would revert on-chain — estimation may fail with a revert reason
- Network unavailability or RPC node errors cause service timeouts
- 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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