# QuantaFlow x402 API Gateway – Alchemy Monad Mainnet

> QuantaFlow x402 API Gateway – Alchemy Monad 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 2026-10-11).

Proxies paid API requests to the Alchemy Monad mainnet RPC/data endpoint using the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-monad-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-monad-mainnet-54d96cc0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q1f3ouibE75fLH1vBnu1_

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-monad-mainnet-54d96cc0 -d '<json body>'
```

Example prompt: Can you check the current block number on Monad mainnet using the Alchemy gateway — just forward a GET to the root path with no body?

## When to prefer this

Use this endpoint when you need pay-per-call access to Alchemy's Monad mainnet RPC or data APIs without managing an Alchemy API key directly, and your agent has a USDC wallet capable of x402 micropayments. Prefer this over a direct Alchemy subscription for low-frequency or cost-controlled agent usage on the Monad blockchain specifically.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 Payment Required with no upstream call
- Invalid path: upstream returns 404 if the specified path does not exist on Alchemy Monad
- Malformed body: upstream returns 400 if the JSON body is invalid for the RPC method
- Upstream outage: Alchemy Monad service unavailable returns 502 or 503
- Rate limiting: Alchemy upstream may return 429 if downstream quota is exceeded
- Network timeout: vercel.app cold-start or upstream latency may cause timeouts

## 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 and content type from the Alchemy Monad mainnet API, passed through transparently after the x402 micropayment of $0.01 USDC is processed. The agent receives whatever the upstream RPC or data API returns for the given path, method, query, 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-monad-mainnet-54d96cc0/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)