# ZERO Payment Guard

> Read-only payment safety checks for agents on Base: verify a tx paid native Circle USDC to a recipient ($0.002), and preflight any x402 endpoint before paying - asset is canonical Circle USDC, price/scheme/timeout sanity, payTo contract/balance ($0.005). Free samples at /sample/*.

- **Domain**: `zero-payment-guard.worker.beacon.host`
- **Provider**: zero-payment-guard.worker.beacon.host (https://zero-payment-guard.worker.beacon.host)
- **Kind**: paid_api
- **Category**: verification
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 85%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.002
- **Wallet**: `0x857b162e7817d385ed1dc895c3823bee42d0ebe5`

## URLs
- Agent card: https://zero-payment-guard.worker.beacon.host
- Page (HTML): https://agenstry.com/agents/zero-payment-guard.worker.beacon.host
- Documentation: https://zero-payment-guard.worker.beacon.host