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Synapse API — Blockchain Gas Estimator
x402
Synapse API — Blockchain 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 2026-10-16).
Estimates the gas cost for a transaction on a blockchain network given transaction parameters such as sender, recipient, data payload, 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) for the specified transaction, allowing the caller to budget fees and decide whether to proceed with the on-chain operation.
Example use cases
Pre-flight smart contract call check
“Before I send this contract interaction — from 0x1234...abcd to 0xcontract...5678 with calldata 0xa9059cbb000...and zero ETH value — can you estimate how much gas it will consume?”
Token transfer cost estimation
“I'm about to send 100 USDC on-chain. Can you estimate the gas fee for a transfer from my wallet 0xAAA...111 to 0xBBB...222 using the ERC-20 transfer calldata?”
DeFi swap gas budget planning
“I want to know how much gas a Uniswap swap will use — from address 0xDEF...999 calling the swap router at 0xRouter...000 with this encoded swap data and 0 ETH value, so I can decide if it's worth executing right now.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/degen/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate without maintaining your own blockchain node or RPC infrastructure. Ideal for agents that need to pre-check transaction costs across multiple blockchain networks before committing funds, especially in a degen/DeFi context where gas volatility matters.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed or non-hex 'data' field causes parsing failure
- Network unavailable or unsupported chain results in a timeout or error response
- Insufficient context (missing required fields) may return a default or zero estimate
- Rate limiting or payment failure returns a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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