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Synapse API — Plasma Gas Estimator
x402
Synapse API — Plasma 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 2026-10-29).
Estimates gas cost for an EVM transaction given to/from/data/value fields across supported blockchain networks
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 (typically in gas units) for the described EVM transaction, allowing callers to set appropriate gas limits and estimate transaction fees before broadcasting.
Example use cases
Pre-flight gas check for ETH transfer
“Before I send 1 ETH from my wallet 0xAbc123... to 0xDef456..., can you estimate the gas cost so I know it'll go through without running out of gas?”
Smart contract call cost forecast
“I want to call a contract at 0xContractAddr... with this calldata 0xa9059cbb... from 0xMyWallet... — can you estimate how much gas that will consume?”
DeFi transaction fee planning
“I'm about to execute a swap on-chain — from address 0xTrader..., to 0xRouter..., with value 0 and this encoded data 0x38ed1739... — estimate the gas so I can set a proper gas limit.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/plasma/gas/estimate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate for an EVM-compatible transaction before broadcasting it, especially when you don't want to run your own node or maintain RPC infrastructure. Prefer this over direct RPC calls when operating in an agentic or serverless context billed per call via x402.
Side effects
- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed hex 'data' field causes parsing failure
- Unsupported network or chain context may return an error or zero estimate
- Simulation failure if the transaction would revert on-chain
- Empty or missing required fields may return a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| from | string | |
| value | string |
Tags
x402
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