# QuantaFlow x402 API Gateway – Alchemy MegaETH Mainnet

> QuantaFlow x402 API Gateway – Alchemy MegaETH Mainnet is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Proxies paid HTTP requests to the Alchemy MegaETH mainnet RPC/API endpoint, charging $0.01 USDC per call via the x402 payment protocol.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-megaeth-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-megaeth-mainnet-2110e785
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R7WNb_7fVdfWK-B9hmWQy

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 quantaflow-x402-api-gateway-alchemy-megaeth-mainnet-2110e785 -d '<json body>'
```

Example prompt: Query the MegaETH mainnet via Alchemy to get the latest block number — use the x402 pay-per-call gateway and forward a JSON-RPC eth_blockNumber request.

## When to prefer this

Choose this endpoint when you need pay-per-call access to the Alchemy MegaETH mainnet RPC without committing to a subscription, or when your agent operates in a web3 environment that supports the x402 micropayment protocol and you want to minimize upfront API key management.

## Known failure modes

- Insufficient USDC balance or x402 payment failure — returns 402 Payment Required
- Invalid path or unsupported RPC method — upstream returns 400 or 404
- Alchemy upstream unavailable — returns 502/503
- Malformed JSON body — upstream rejects with 400
- Rate limit exceeded on upstream Alchemy node — returns 429

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

The raw upstream response body from Alchemy's MegaETH mainnet API, passed through as-is with its original content type (typically JSON-RPC response). Payment is deducted automatically before the response is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-megaeth-mainnet-2110e785/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)