# promptshield.grindfree.net

> Pay-per-request prompt-injection screener and HTML cleaner for AI agents. POST untrusted text or HTML to /v1/screen for a risk score plus sanitized text, or /v1/clean for HTML-to-LLM text. Catches hidden instructions, invisible unicode, markdown image exfil, and secret-exfil patterns. $0.002 USDC on Base via x402 v2. No API keys. Contact @grindfreelabs or rob@grindfree.net.

- **Domain**: `promptshield.grindfree.net`
- **Provider**: promptshield.grindfree.net (https://promptshield.grindfree.net)
- **Kind**: paid_api
- **Category**: verification
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 100%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.002
- **Wallet**: `0xe4b5827994b7b3cd38f9830d9ecf58b51b77721b`

## URLs
- Agent card: https://promptshield.grindfree.net/
- Page (HTML): https://agenstry.com/agents/promptshield.grindfree.net
- Documentation: https://promptshield.grindfree.net/v1/clean