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Synapse API — Aptos Gas Estimator
x402
Synapse API — Aptos 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 cost for a transaction on the Aptos blockchain given sender, recipient, value, and calldata
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 cost for the specified Aptos transaction, including the computed fee in native units, allowing callers to budget transaction costs before submission.
Example use cases
Pre-flight fee check for APT transfer
“Before I send 50 APT from address 0x1a2b3c to 0x4d5e6f, can you estimate how much gas that transaction will cost on Aptos?”
Gas estimation for smart contract interaction
“I want to call a contract on Aptos — the target is 0xcontract123, my wallet is 0xmywallet456, and the calldata is 0xabcdef. What's the estimated gas fee?”
Budget gas for DeFi swap on Aptos
“I'm planning an Aptos DeFi swap sending value 200 from address 0xswapper1 to 0xdex2 with data 0x12345678 — can you estimate the transaction gas cost so I can budget my fees?”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/aptos/gas/estimateWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for an Aptos-specific transaction without running your own Aptos node. Preferable over generic blockchain gas estimators when you are specifically working on the Aptos network and need low-latency pre-flight fee checks.
Side effects
- Invalid or malformed address fields return a 400 error
- Unsupported or invalid calldata format causes estimation failure
- Network connectivity issues to Aptos RPC nodes may cause timeouts
- Missing required fields (from/to) result in validation errors
- Value field with non-numeric or improperly formatted strings may fail parsing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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