# Synapse API — MegaETH Gas Estimator

> Synapse API — MegaETH 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 transactions on the MegaETH blockchain network given transaction parameters.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/megaeth/gas/estimate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-megaeth-gas-estimator-47f74ba9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D3shPcxd0LA4_unla8w-0

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synapse-api-megaeth-gas-estimator-47f74ba9 -d '<json body>'
```

Example prompt: Estimate the gas needed for a MegaETH transaction from 0xAbC123... to 0xDeF456... with value 0.5 ETH and no extra calldata.

## When to prefer this

Use this endpoint when you specifically need gas estimates for the MegaETH network (not mainnet Ethereum or other EVM chains). It is ideal for agents that need to preflight transactions, budget gas fees, or validate transaction feasibility before committing on MegaETH. Pay-per-call x402 pricing at $0.01 USDC makes it cost-effective for occasional lookups.

## Known failure modes

- Invalid or malformed Ethereum address in 'to' or 'from' fields returns an error
- Invalid hex data in 'data' field causes parsing failure
- Transaction would revert on-chain may return an error or unreliable estimate
- Network unavailability on MegaETH RPC results in timeout or 503
- Missing required fields may return validation error

## 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 (in gas units) for the described MegaETH transaction, allowing the caller to assess transaction feasibility and fee costs before broadcasting.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string"
  },
  "data": {
   "type": "string"
  },
  "from": {
   "type": "string"
  },
  "value": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-megaeth-gas-estimator-47f74ba9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)