# QuantaFlow x402 API Gateway – Infura StarkNet Mainnet Proxy

> QuantaFlow x402 API Gateway – Infura StarkNet 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 2026-09-14).

Proxies requests to Infura's StarkNet mainnet RPC endpoint via the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/infura-starknet-mainnet
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-infura-starknet-mainnet-proxy-d4d73b01
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uakt1PE41tTFCh3TjmT0F

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-infura-starknet-mainnet-proxy-d4d73b01 -d '<json body>'
```

Example prompt: Query the StarkNet mainnet via Infura to get the latest block number — use the x402 pay-per-call gateway and forward the starknet_blockNumber RPC call.

## When to prefer this

Choose this endpoint when you need pay-as-you-go access to StarkNet mainnet RPC without a long-term Infura subscription or API key, especially in agent workflows that require on-demand blockchain queries billed per call in USDC via the x402 protocol.

## Known failure modes

- Insufficient USDC balance causes x402 payment failure and request is rejected
- Invalid or malformed StarkNet RPC path returns upstream 400 or 404 error
- StarkNet mainnet RPC method not supported by Infura returns JSON-RPC error
- Network timeout or Infura outage causes upstream 503 or connection error
- Malformed JSON body causes Infura to return parse error
- Payment facilitator unavailable prevents x402 handshake from completing

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

The raw upstream HTTP response from Infura's StarkNet mainnet RPC, passed through transparently after successful $0.01 USDC x402 payment — including JSON-RPC result objects such as block data, transaction receipts, contract storage values, or account balances.

## 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-infura-starknet-mainnet-proxy-d4d73b01/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)