# QuantaFlow x402 API Gateway – Alchemy Sui Testnet

> QuantaFlow x402 API Gateway – Alchemy Sui Testnet is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Proxies paid API requests to Alchemy's Sui testnet RPC endpoint via the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-sui-testnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-sui-testnet-753fe437
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iT7b-7AGAPMUxpRYxyU7F

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-sui-testnet-753fe437 -d '<json body>'
```

Example prompt: Query the Sui testnet via Alchemy's RPC — forward a POST to the /v2/{apiKey} path with this JSON body: {"jsonrpc":"2.0","id":1,"method":"sui_getLatestCheckpointSequenceNumber","params":[]} and pay the $0.01 USDC fee per call.

## When to prefer this

Choose this endpoint when you need pay-per-use, no-API-key access to Alchemy's Sui testnet RPC via the x402 micropayment protocol. Ideal for agents that want to avoid managing long-lived API credentials and prefer on-demand microtransaction billing in USDC for testnet development and testing workflows.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 response before the request is forwarded
- Invalid path: upstream returns 404 if the path below the Alchemy origin is malformed
- Upstream RPC error: Alchemy returns a JSON-RPC error if the method or params are invalid
- Rate limiting: Alchemy may throttle if the underlying API key is overloaded
- Malformed body: upstream returns 400 if the JSON body is not valid JSON-RPC

## 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 Sui testnet RPC, passed through as-is including the original content-type header. Typically a JSON-RPC response object with result or error fields matching the Sui RPC specification.

## 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-sui-testnet-753fe437/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)