# Sentinel - Autonomous Trust API & Bot Protection

> Sentinel is the CAPTCHA alternative for APIs. We provide sub-50ms trust decisions using infrastructure forensic signals to stop 92% of automated attacks without user friction.

## Product Overview

Sentinel is a deterministic trust layer for modern APIs. We replace legacy CAPTCHAs and blacklists with behavioral analytics and infrastructure forensics.

### Core Features
- **Sub-50ms Decision Latency**: In-memory ASN matrix and velocity tracking
- **92% Bot Block Rate**: Multi-layer intelligence synthesis
- **Zero User Friction**: Invisible to legitimate users
- **GDPR Compliant**: Privacy-first architecture with optional strict mode

## Key Documentation

### Getting Started
- [Quick Start Guide](https://sentinel.risksignal.name.ng/docs.html)
- [API Reference](https://sentinel.risksignal.name.ng/docs.html#api-reference)
- [Integration Examples](https://sentinel.risksignal.name.ng/index.html#integration)

### Security Guides
- [Stop AI Bot Abuse](https://sentinel.risksignal.name.ng/guides/stop-ai-bot-abuse.html) - Defending against agentic AI and high-velocity scrapers
- [Agentic AI Security](https://sentinel.risksignal.name.ng/guides/agentic-ai-security.html) - Securing autonomous agents and AI orchestration
- [AI Detector Bypass](https://sentinel.risksignal.name.ng/guides/ai-detector-bypass.html) - Why traditional detection fails and how infrastructure forensics work
- [AI Coding Security](https://sentinel.risksignal.name.ng/guides/ai-coding-security.html) - Protecting Cursor AI, Replit, and Copilot environments
- [Generative Media Defense](https://sentinel.risksignal.name.ng/guides/protecting-generative-media.html) - Securing Sora AI, HeyGen, and compute-intensive platforms
- [Academic AI Security](https://sentinel.risksignal.name.ng/guides/securing-academic-ai.html) - Protecting research intelligence from data harvesting
- [LLM Guardrails](https://sentinel.risksignal.name.ng/guides/deep-intelligence-guardrails.html) - Defending DeepSeek, Kimi, and next-gen LLM APIs

### Use Cases
- [Signup Abuse Prevention](https://sentinel.risksignal.name.ng/use-cases/signup-abuse.html)
- [API Bot Protection](https://sentinel.risksignal.name.ng/use-cases/api-bot-protection.html)
- [Credential Stuffing Defense](https://sentinel.risksignal.name.ng/blog/stopping-ato.html)

### Technical Deep Dives
- [Why CAPTCHA is Dead](https://sentinel.risksignal.name.ng/blog/why-is-captcha-dead.html)
- [Turnstile for APIs](https://sentinel.risksignal.name.ng/blog/turnstile-for-apis.html)
- [The Ghost Traffic Tax](https://sentinel.risksignal.name.ng/blog/ghost-traffic-tax.html)
- [Beyond the Bot](https://sentinel.risksignal.name.ng/blog/beyond-the-bot.html)

## How Sentinel Works

### 1. Infrastructure Analysis (Layer 0)
- ASN Governance Verification
- Datacenter vs. Residential Partitioning
- Mobile Carrier Identification Matrix

### 2. Behavioral Synthesis (Layer 1)
- Velocity Entropy Tracking
- Sub-minute Scan Pattern Matching
- Global Threat Node Integration

### 3. Economic Resistance (Layer 2)
- Behavioral Work Tokens (BWT)
- Non-interactive Proof of Intent
- Deterministic Hold Verifications

## API Endpoints

### Primary Decision Endpoint
```
POST /v1/check?mode=decision
```
Returns immediate PASS/BLOCK decision with confidence score and remediation recommendations.

### Challenge System (SOCA)
```
POST /v1/challenge/issue
POST /v1/challenge/verify
```
Optional behavioral work challenges for suspicious-but-uncertain traffic.

## Integration Example

```javascript
const res = await sentinel.check(ip, { profile: 'signup' });

if (!res.allow) {
    if (res.remediation?.recommended) {
        return res.status(res.http_status).json({
            action: "challenge",
            challenge_url: "/verify"
        });
    }
    return res.status(res.http_status).send(res.reason);
}
```

## Pricing

- **Free Tier**: 1,000 decisions/month
- **Pro Tier**: 500,000 decisions/month with deep forensics
- **Enterprise**: Custom volume and SLA

## Comparisons

- [Sentinel vs. reCAPTCHA](https://sentinel.risksignal.name.ng/blog/why-is-captcha-dead.html)
- [Sentinel vs. Cloudflare Turnstile](https://sentinel.risksignal.name.ng/blog/turnstile-for-apis.html)
- [Sentinel vs. Legacy WAFs](https://sentinel.risksignal.name.ng/blog/beyond-the-bot.html)

## Support & Contact

- **Documentation**: https://sentinel.risksignal.name.ng/docs.html
- **Dashboard**: https://sentinel.risksignal.name.ng/dashboard.html
- **Sales**: https://wa.me/2347030767766

## Powered By

RiskSignal Intelligence - https://app.risksignal.name.ng

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*Built for security engineers who refuse to compromise between protection and user experience.*