# QuantaFlow x402 API Gateway — Alchemy Arbitrum Mainnet

> QuantaFlow x402 API Gateway — Alchemy Arbitrum 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 requests to Alchemy's Arbitrum mainnet RPC/API endpoint via the x402 micropayment protocol, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-arb-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-arbitrum-mainnet-e8003143
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TnXfMl0z5bwzwB6V8N7Jf

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-arbitrum-mainnet-e8003143 -d '<json body>'
```

Example prompt: Using the Alchemy Arbitrum mainnet gateway, fetch the latest block number — route the GET request to /v2/{apiKey} with no body.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Arbitrum One mainnet RPC without managing an Alchemy API key subscription — ideal for agents that need occasional or bursty Arbitrum blockchain queries billed in USDC micropayments via the x402 protocol.

## Known failure modes

- Insufficient USDC balance causes payment failure and request rejection
- Invalid or malformed path causes upstream 404 or routing error
- Malformed JSON body causes Alchemy to return an RPC error
- Alchemy API rate limit exceeded returns upstream 429
- Invalid Arbitrum contract address or method signature returns RPC execution error
- Network congestion may cause slow upstream response

## 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 Arbitrum mainnet node is passed through verbatim after payment is processed — this includes JSON-RPC results such as block data, transaction receipts, contract call outputs, token balances, or any other Alchemy-supported Arbitrum data.

## 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-arbitrum-mainnet-e8003143/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)