# QuantaFlow x402 API Gateway — Alchemy Superseed Mainnet

> QuantaFlow x402 API Gateway — Alchemy Superseed 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 2026-10-16).

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

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-superseed-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-superseed-mainnet-5b6e0875
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uIay96MIGfq3Q1vmbN963

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-superseed-mainnet-5b6e0875 -d '<json body>'
```

Example prompt: Look up the latest block number on Superseed mainnet using the Alchemy endpoint — forward a GET request to /v2/eth_blockNumber with no body.

## When to prefer this

Use this endpoint when you need metered, pay-per-call access to Alchemy's Superseed mainnet node without managing a dedicated Alchemy API key, and you want to pay per request via x402 USDC micropayments. Prefer this over direct Alchemy API access when building agent workflows that require cost-proportional billing or when integrating into x402-native payment pipelines.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not accepted — request blocked before forwarding
- Invalid path: upstream Alchemy endpoint returns 404 or 400 if the path or method is unsupported
- Upstream error: Alchemy node returns 5xx or RPC error if the Superseed mainnet node is unreachable
- Malformed body: JSON parse error if the body string is not valid JSON for a POST request
- Rate limiting: Alchemy may throttle requests exceeding their node limits even after payment

## 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 Superseed mainnet API is passed through transparently after the $0.01 USDC x402 micropayment is confirmed, preserving the original content type and body.

## 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-superseed-mainnet-5b6e0875/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)