🛡️ ShieldAPI — Security Intelligence for AI Agents

ShieldAPI is a pay-per-request Security Intelligence Service built on the x402 protocol (HTTP 402 Payment Required). It lets any AI agent perform comprehensive security checks — without accounts, API keys, or subscriptions. Just call, pay, get results.

Payments are settled in USDC on Base Sepolia. All endpoints support free demo mode.

Base URL: https://shield.vainplex.dev/api

Health/Discovery: GET /api/health (free, lists all endpoints + prices)

Endpoints

1. check-password — Password Breach Check

Checks a full SHA1 hash against 900M+ leaked passwords (HIBP Pwned Passwords).

• Cost: 0.001 USDC
• Request: GET /api/check-password?hash=<40-char-sha1>
• Returns: { found: true/false, count: 3861493 }

2. check-password-range — k-Anonymity Range Lookup

Returns all matching hash suffixes for a 5-char prefix (privacy-preserving).

• Cost: 0.001 USDC
• Request: GET /api/check-password-range?prefix=<5-char-sha1-prefix>
• Returns: { prefix, total_matches, results: [{ suffix, count }] }

3. check-domain — Domain Reputation

Checks DNS records, SPF/DMARC, SSL certificate, and queries Spamhaus/SpamCop/SORBS blacklists.

• Cost: 0.003 USDC
• Request: GET /api/check-domain?domain=<domain>
• Returns: { domain, dns, blacklists, ssl, risk_score, risk_level }

4. check-ip — IP Reputation

Checks IPv4 against 4 blacklists, detects Tor exit nodes, resolves reverse DNS.

• Cost: 0.002 USDC
• Request: GET /api/check-ip?ip=<ipv4>
• Returns: { ip, blacklists, is_tor_exit, reverse_dns, risk_score, risk_level }

5. check-email — Email Breach Exposure

Checks which data breaches affected the email's domain. Returns breach details, exposed data types, and risk recommendations.

• Cost: 0.005 USDC
• Request: GET /api/check-email?email=<email>
• Returns: { breaches: [...], domain_breach_count, risk_score, risk_level, recommendations }
• Example: test@linkedin.com → 3 breaches (2012: 164M accounts, 2021 scrape: 125M, 2023 scrape: 19M)

6. check-url — URL Safety & Phishing Detection

Checks URL against URLhaus malware database, runs heuristic analysis (brand impersonation, suspicious TLDs, redirect chains), and probes HTTP.

• Cost: 0.003 USDC
• Request: GET /api/check-url?url=<url>
• Returns: { url, checks: { urlhaus, heuristics, http }, threats, risk_score, risk_level }
• Detects: Malware distribution, brand impersonation (PayPal, Google, etc.), suspicious TLDs (.tk, .ml), excessive subdomains, login path keywords

7. full-scan — Combined Security Scan

Runs all applicable checks in parallel. Pass any combination of inputs.

• Cost: 0.01 USDC
• Request: GET /api/full-scan?email=<email>&password_hash=<sha1>&domain=<domain>&ip=<ip>&url=<url>
• Returns: Combined results with overall risk score and human-readable summary
• Example: ?email=test@linkedin.com&password_hash=5BAA61... → "⚠️ Password found in 52M breaches, ⚠️ Domain affected by 3 breaches"

Demo Mode

All 7 endpoints support ?demo=true — returns realistic fake data, no payment required. Perfect for testing your integration before going live.

# Try it now:
curl -s "https://shield.vainplex.dev/api/check-url?demo=true"
curl -s "https://shield.vainplex.dev/api/full-scan?demo=true"
curl -s "https://shield.vainplex.dev/api/check-email?demo=true"

x402 Payment Flow

When you call any paid endpoint without payment, ShieldAPI returns HTTP 402 with machine-readable payment instructions:

{
  "x402Version": 1,
  "error": "X-PAYMENT header is required",
  "accepts": [{
    "scheme": "exact",
    "network": "base-sepolia",
    "maxAmountRequired": "3000",
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "payTo": "0x...",
    "resource": "https://shield.vainplex.dev/api/check-domain?domain=example.com",
    "description": "Domain reputation & security check"
  }]
}

An x402-enabled client (using @coinbase/x402, @x402/core, or any x402 library) will:

1. Read the 402 response
2. Sign a USDC payment on Base Sepolia
3. Retry with X-PAYMENT header
4. Receive the security check results

Use Cases

• Password rotation agents — Check if proposed passwords are in breach databases before setting them
• Email onboarding — Verify new user emails aren't from heavily breached domains
• URL safety gates — Screen links before agents click or users visit them
• IP allowlisting — Verify IPs aren't Tor exits, proxies, or blacklisted
• Security audits — Full-scan an organization's domain, IPs, and common passwords in one call

Source & Links

• Live API: https://shield.vainplex.dev/api/health
• Source: https://github.com/alberthild/shieldapi (coming soon)
• Protocol: https://x402.org
• Data: HIBP (CC-BY), PhishTank, URLhaus (abuse.ch), Spamhaus