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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 2026-09-15).
Estimates gas costs for a transaction on a 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 an estimated gas amount (in gas units) required to execute the described transaction, allowing agents to assess transaction feasibility and fee costs before submission.
Example use cases
Pre-flight gas check for token transfer
“Before I send 500 USDC from 0xSender... to 0xRecipient... on-chain, estimate the gas cost so I can make sure I have enough ETH to cover fees.”
Smart contract interaction cost preview
“I'm about to call a DeFi contract at 0xContract... with this calldata 0xabcdef... — can you estimate the gas it'll use so I can decide whether it's worth executing right now?”
Batch transaction cost planning
“I need to figure out how expensive it will be to execute this transaction: from 0xMyWallet..., to 0xProtocol..., data 0x1234abcd..., value 0. Give me a gas estimate so I can plan my budget.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/stable/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for a blockchain transaction without maintaining your own RPC node. Prefer it over direct RPC calls when operating in a serverless or agent context where infrastructure management is undesirable. It supports 57+ blockchain networks, making it suitable for multi-chain use cases without configuring separate providers.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed calldata hex string causes a parsing error
- Unavailable or unsupported chain context may return an error or null estimate
- Network timeout or RPC failure on the backend returns a 5xx error
- Missing required fields results in a 400 validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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