# QuantaFlow x402 API Gateway – Alchemy Metis Mainnet

> QuantaFlow x402 API Gateway – Alchemy Metis 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 2026-10-24).

Proxies paid API requests to the Alchemy Metis mainnet RPC/data endpoint using the x402 micropayment protocol at $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-metis-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-metis-mainnet-9de6f37e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v9UijbQ_ZxnW3RWhnJcLv

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-metis-mainnet-9de6f37e -d '<json body>'
```

Example prompt: Query the latest block number on Metis mainnet through Alchemy — forward a eth_blockNumber JSON-RPC call to the root path.

## When to prefer this

Use this endpoint when you need pay-per-call access to Alchemy's Metis mainnet node without committing to a subscription, particularly in agent pipelines where blockchain queries are infrequent or cost must be metered per call using x402 USDC micropayments. Prefer it over direct Alchemy API keys when operating in a trustless, wallet-based payment context.

## Known failure modes

- Payment verification failure: x402 payment header missing or insufficient USDC balance returns 402 Payment Required
- Invalid path: unrecognized RPC method or malformed path returns upstream error
- Alchemy node error: upstream RPC errors (e.g. invalid params, method not found) passed through as-is
- Network timeout: Metis mainnet node unresponsive causes gateway timeout
- Malformed JSON body: invalid JSON in body field causes request forwarding failure

## How this service works

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

## Output

The raw upstream response from Alchemy's Metis mainnet node, including the response body and content-type header, passed through transparently after the x402 micropayment of $0.01 USDC is verified and settled.

## 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-metis-mainnet-9de6f37e/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)