{"ip": "216.73.216.202", "tier": "free", "free": {"used": 0, "limit": 10, "remaining": 10}, "paid": null, "price_usd": 0.5, "pay_to": "0xe51e284b6fbd870f43a2b112d40e48b34f8a7963", "how": "POST /rpc; over free tier -> 402 challenge -> send USDC (Base) -> retry with x-paywall-tx header"}