The Security Layer
for AI Infrastructure
Protect your AI agents from prompt injection attacks and credential leaks. Stronghold scans every request through a transparent proxy, blocking threats before they reach your models.
AI Agents Are Vulnerable
As AI agents gain access to sensitive data and systems, they become prime targets. Traditional security tools weren't built for this threat model.
Without Stronghold
- ×Direct access to AI models
- ×No input validation
- ×Sensitive data exposed in outputs
- ×No audit trail of requests
- ×Attacks go undetected
With Stronghold
- ✓Transparent proxy intercepts all traffic
- ✓4-layer scanning detects attacks
- ✓Credential leaks blocked automatically
- ✓Complete audit trail via headers
- ✓Real-time threat detection
Prompt Injection
Attackers embed malicious instructions that override your system prompts.
Credential Leaks
AI models accidentally expose API keys, passwords, or sensitive data.
Jailbreak Attacks
Sophisticated techniques bypass safety guardrails entirely.
Data Exfiltration
Malicious prompts trick AI into sending private data to attackers.
Transparent Protection
Install once. Protect everything. Stronghold operates at the network level, so it works with any AI agent without code changes.
Install
One command setup with automatic OS keyring configuration. Your wallet is created locally—private keys never leave your device.
Enable
Transparent proxy intercepts all HTTP/HTTPS traffic at the network level. Works system-wide, no code changes needed.
Scan
Every request is analyzed for prompt injection, credential leaks, and jailbreak attempts. Threats blocked in under 50ms.
Everything You Need to Secure AI
A complete security layer designed specifically for AI infrastructure. Self-hosted, open source, and crypto-native.
Prompt Injection Detection
4-layer scanning architecture: heuristics, ML classification, semantic similarity, and LLM classification catch even sophisticated attacks.
Credential Leak Prevention
Scans LLM outputs for API keys, passwords, and sensitive data patterns. Blocks accidental exfiltration before it reaches users.
Transparent Proxy
System-wide protection at the network level. No code changes, no environment variables, no proxy configuration needed.
x402 Payments
Pay-per-scan using USDC on Base. No subscriptions, no upfront costs. Only pay for what you use with crypto-native payments.
Local Wallet
Private keys stored in your OS keyring (macOS Keychain, Linux Secret Service, Windows Credential). Keys never leave your device.
Real-time Blocking
Sub-50ms latency with instant ALLOW/WARN/BLOCK decisions. Malicious requests stopped before they reach your AI models.
Simple, Powerful, Fast
Simple, Transparent Pricing
Pay only for what you use. No subscriptions, no hidden fees. Powered by the x402 payment protocol.
Self-Hosted
Run your own instance
- Full source code access
- Self-hosted proxy
- Bring your own API keys
- Community support
- Manual x402 payments
Pay Per Scan
Usage-based pricing
- Managed infrastructure
- Automatic scaling
- Usage dashboard
- Email support
- x402 crypto payments
- Sub-50ms latency SLA
Enterprise
For large organizations
- Dedicated infrastructure
- Custom ML models
- SSO & audit logs
- 24/7 phone support
- Custom integrations
- SLA guarantees
Built for AI Engineers, by AI Engineers
Common Questions
Stronghold is a security layer for AI infrastructure that protects agents from prompt injection attacks and credential leaks. It operates as a transparent proxy, scanning all HTTP/HTTPS traffic before it reaches your AI models.