# QuantaFlow x402 API Gateway – Alchemy Unichain Mainnet

> QuantaFlow x402 API Gateway – Alchemy Unichain 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 2026-10-12).

Proxies POST requests to Alchemy's Unichain mainnet RPC/API through an x402 micropayment gateway, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-unichain-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-unichain-mainnet-a8d57de1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CoA-v5l6LeSf7OsxcFi84

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-unichain-mainnet-a8d57de1 -d '<json body>'
```

Example prompt: Use the QuantaFlow Unichain mainnet gateway to fetch the latest block number — forward a POST to the root path with the eth_blockNumber JSON-RPC body.

## When to prefer this

Choose this endpoint when you need pay-per-request access to Alchemy's Unichain mainnet without managing an Alchemy API subscription or API key — ideal for agents making occasional or unpredictable blockchain queries where a flat subscription is wasteful, or when operating in a web3-native context where USDC micropayments via x402 are already supported.

## Known failure modes

- Payment failure: insufficient USDC balance or invalid x402 payment header returns 402 Payment Required
- Invalid path: unrecognized API path returns upstream 404 or error
- Malformed request body: invalid JSON-RPC body causes upstream 400 error
- Upstream unavailability: Alchemy Unichain node downtime causes 502 or 503
- Rate limiting: excessive requests may trigger upstream throttling

## 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 Unichain mainnet API, passed through transparently after successful x402 micropayment verification, including JSON-RPC results, blockchain state, or any other data returned by the upstream Alchemy endpoint.

## 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-unichain-mainnet-a8d57de1/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)