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Synapse API — Soneium Gas Estimator
x402
Synapse API — Soneium 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 Soneium blockchain network before submission
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 described transaction on the Soneium network, allowing callers to forecast fees before broadcasting the transaction on-chain.
Example use cases
Pre-flight check before DeFi swap
“I'm about to execute a swap on a Soneium DEX. Can you estimate the gas cost first? The transaction goes from 0xSenderAddress to 0xDEXContractAddress with calldata 0xswapCalldata and value 0.05 ETH.”
Smart contract deployment cost preview
“Before I deploy my NFT contract on Soneium, can you estimate how much gas that will take? The deployer is 0xMyWallet, the deployment data is 0xcontractBytecode, and there's no ETH value attached.”
Token transfer gas budgeting
“I need to send some tokens on Soneium from 0xMyAddress to 0xRecipientAddress using the ERC-20 transfer calldata 0xa9059cbb... — what's the estimated gas cost so I can make sure I have enough?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/soneium/gas/estimateWhen to prefer
Use this endpoint when you need a gas estimate specifically for the Soneium blockchain network before committing to a transaction. Prefer this over generic gas estimation tools when your transaction targets a Soneium contract or address, and you want a pay-per-call approach without managing RPC infrastructure yourself.
Side effects
- Invalid or malformed address fields (to/from) may return a validation error
- Malformed or non-hex data field may cause estimation failure
- Insufficient or missing required fields may return a 400 Bad Request
- Soneium RPC node unavailability may cause timeouts or 503 errors
- Transactions that would revert on-chain may return an execution error instead of a gas estimate
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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