# QuantaFlow x402 Gateway – Infura Arbitrum Mainnet Proxy

> QuantaFlow x402 Gateway – Infura Arbitrum Mainnet Proxy is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Proxies JSON-RPC and REST calls to Infura's Arbitrum Mainnet node endpoint via the x402 micropayment protocol, charging $0.01 USDC per request.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/infura-arbitrum-mainnet
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-gateway-infura-arbitrum-mainnet-proxy-4c331357
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eT3U2QMjmUR8l5WFs3eYj

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-gateway-infura-arbitrum-mainnet-proxy-4c331357 -d '<json body>'
```

Example prompt: Check the current ETH balance of wallet 0xAbC...123 on Arbitrum mainnet using the Infura node — forward an eth_getBalance call to the latest block.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Infura's Arbitrum Mainnet node without managing an Infura API key subscription — ideal for low-volume or on-demand blockchain queries where the x402 micropayment model ($0.01/call) is more cost-effective than a monthly plan. Prefer this over direct Infura access when operating in an autonomous agent context that already handles x402 payments.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment header missing — returns 402 Payment Required
- Invalid RPC method or malformed JSON body — upstream returns JSON-RPC error object
- Path not found on upstream Infura node — returns 404 or upstream error
- Infura rate limit or node unavailability — upstream 429 or 503 propagated through
- Network timeout reaching Arbitrum node — request hangs or returns gateway timeout

## 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 Infura's Arbitrum Mainnet node, passed through transparently after successful x402 micropayment. Typically a JSON-RPC response containing result fields like block numbers, balances, transaction receipts, or contract return values, along with the upstream content type.

## 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-gateway-infura-arbitrum-mainnet-proxy-4c331357/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)