# QuantaFlow x402 API Gateway – Alchemy Sei Mainnet

> QuantaFlow x402 API Gateway – Alchemy Sei 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 API requests to the Alchemy Sei Mainnet RPC/API endpoint using the x402 micropayment protocol at $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-sei-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-sei-mainnet-6b8ce29b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sjkjeAau5zSgu1lpVCjnc

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-sei-mainnet-6b8ce29b -d '<json body>'
```

Example prompt: Look up the current token balance for wallet 0xABC123 on Sei mainnet using the Alchemy Sei endpoint — I'm okay paying a small per-request fee.

## When to prefer this

Choose this endpoint when you need pay-per-use access to Alchemy's Sei Mainnet RPC without committing to a subscription, and your agent already supports the x402 micropayment protocol. Ideal for low-frequency or bursty blockchain queries on Sei where a flat monthly API plan would be wasteful.

## Known failure modes

- Payment failure: x402 payment header missing or insufficient USDC balance results in HTTP 402
- Invalid path: unrecognized Alchemy API path returns upstream 404 or error
- Malformed body: invalid JSON in body field causes upstream parse error
- Network timeout: Sei mainnet RPC node unavailable returns timeout error
- Rate limiting: excessive requests may trigger upstream Alchemy rate limits

## 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 the Alchemy Sei Mainnet API, passed through as-is, including the response body and content type. This may include JSON-RPC results, account data, block information, transaction receipts, or other blockchain query outputs depending on the path and method called.

## 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-sei-mainnet-6b8ce29b/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)