# QuantaFlow x402 API Gateway – Infura Base Sepolia

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

Proxies requests to the Infura Base Sepolia RPC endpoint via x402 micropayment-gated API gateway, enabling pay-per-call access to the Base Sepolia testnet blockchain.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/infura-base-sepolia?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-infura-base-sepolia-9d072b88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ktlT23jsLPhcrvWgEZqmO

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-base-sepolia-9d072b88 -d '<json body>'
```

Example prompt: Call eth_blockNumber on the Base Sepolia testnet through Infura and tell me the latest block height — use the QuantaFlow pay-per-call gateway so I don't need to manage an Infura API key.

## When to prefer this

Choose this endpoint when you need pay-per-call access to the Infura Base Sepolia Ethereum testnet RPC without provisioning your own Infura API key or managing subscriptions. Ideal for AI agents testing DeFi workflows, reading smart contract state, or querying testnet data on a per-request basis using x402 USDC micropayments on Base.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 Payment Required before request is forwarded
- Invalid RPC method: Infura returns JSON-RPC error if the method or params are malformed
- Network unavailable: Infura Base Sepolia node downtime returns upstream 5xx error
- Invalid path: unrecognized path below the upstream origin returns 404 or routing error
- Malformed JSON body: upstream rejects non-JSON or structurally invalid request bodies

## How this service works

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

## Output

The raw upstream Infura Base Sepolia JSON-RPC response body is passed through after the x402 micropayment ($0.01 USDC) is processed, including standard Ethereum JSON-RPC fields like result, id, and jsonrpc version.

## 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-base-sepolia-9d072b88/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)