Why Your Choice of VPN Detection API Matters
Not all VPN detection APIs are created equal. The difference between a good and bad provider can mean the difference between catching 95% or 60% of fraudulent traffic. It can mean 30ms response times or 500ms. It can mean a $29/month bill or a $500/month bill for the same volume.
Choosing the wrong API leads to three costly problems: false negatives let fraud through, false positives block legitimate users (costing $15-25 per support ticket), and high latency slows down your user experience. Each of these directly impacts your bottom line.
This guide compares the leading VPN detection APIs across the dimensions that matter most for production applications. We aim to be transparent — VPN Signal is one of the providers reviewed, and we will be upfront about where we excel and where other providers may be a better fit.
How We Evaluated Each Provider
We evaluated each VPN detection API on six criteria that matter most for real-world integration:
- 1.Detection Accuracy. What percentage of known VPN, proxy, and Tor IPs does the API correctly identify? How often does it produce false positives on clean residential IPs?
- 2.Detection Coverage. Does it detect all anonymization types — commercial VPNs, datacenter proxies, residential proxies, Tor, SOCKS/HTTP proxies, and privacy relays?
- 3.Response Latency. How fast does the API respond? Sub-50ms is ideal for inline request processing. Over 200ms becomes noticeable in user flows.
- 4.Risk Scoring. Does the API provide a numeric risk score, or only binary yes/no flags? Risk scoring enables proportional responses and reduces false positive impact.
- 5.Pricing. What does it cost at different volume tiers? Are there hidden costs like overage charges or per-feature pricing?
- 6.Developer Experience. How easy is integration? Quality of documentation, SDK availability, and API design all factor in.
Side-by-Side Comparison Table
Here is how the top VPN detection APIs compare across key criteria:
| Provider | VPN Accuracy | Latency | Risk Score | Residential Proxy | Free Tier | Starting Price |
|---|---|---|---|---|---|---|
| VPN Signal | 99%+ | <50ms | 0-100 | Yes | 100 req/day | $29/mo |
| IPQualityScore | 98%+ | <100ms | 0-100 | Yes | 5,000 req/mo | $49/mo |
| MaxMind minFraud | 95%+ | <150ms | 0-99 | Limited | No | Usage-based |
| Spur | 97%+ | <80ms | Categories | Yes (strong) | Limited | $150/mo |
| IPinfo | 96%+ | <60ms | No | Limited | 50,000 req/mo | $99/mo |
| ipapi.is | 97%+ | <50ms | No | Limited | 1,000 req/day | $19/mo |
| Fingerprint | 97%+ | <100ms | Confidence | Yes | 14-day trial | $200/mo |
A note on accuracy claims
Accuracy numbers are self-reported or based on independent benchmarks where available. Real-world accuracy depends on your traffic mix. We recommend testing 2-3 providers against your own data before committing. Most offer free tiers or trials for exactly this purpose.
Provider Deep Dives
VPN Signal
VPN Signal is a purpose-built VPN and proxy detection API with an emphasis on risk scoring and developer experience. A single endpoint returns VPN, proxy, Tor, relay, and datacenter flags alongside a 0-100 risk score with an actionable recommendation (allow, verify, or block).
Strengths:
- Fastest response times (<50ms average) with optional Redis caching
- Built-in risk scoring with allow/verify/block recommendations
- Simple, predictable pricing — no overage charges
- Clean REST API with minimal integration code needed
- Free tier for testing (100 requests/day, no credit card)
Considerations:
- Newer entrant with a smaller customer base than MaxMind or IPQS
- No downloadable database option — API-only
- No built-in device fingerprinting (focused purely on IP intelligence)
IPQualityScore (IPQS)
IPQualityScore is one of the most established players in IP fraud detection. Their platform goes beyond VPN detection to include email verification, phone validation, and device fingerprinting. The fraud score (0-100) is widely used in e-commerce and fintech.
Strengths:
- Comprehensive fraud platform — IP, email, phone, and device in one
- Strong residential proxy detection
- Detailed fraud score with configurable strictness
- Good free tier (5,000 requests/month)
Considerations:
- Pricing can escalate quickly as you add features (email, phone, device)
- API response includes many fields — can be overwhelming for simple VPN detection
- Higher latency than IP-only providers due to broader analysis
MaxMind (GeoIP2 / minFraud)
MaxMind is the oldest name in IP intelligence. GeoIP2 provides geolocation and anonymizer detection, while minFraud adds transaction-level fraud scoring. Their databases are available for both API access and local download, which is unique among providers.
Strengths:
- Downloadable databases for zero-latency local lookups
- Industry standard — widely integrated with fraud platforms and CDNs
- minFraud provides transaction-level risk scoring beyond IP
- Mature SDKs in nearly every language
Considerations:
- VPN/proxy detection accuracy lags behind specialized providers
- Limited residential proxy detection capability
- Usage-based pricing is hard to predict and can get expensive
- Downloaded databases need regular updates to stay accurate
Spur
Spur takes a threat intelligence approach to IP data. Their focus is on mapping the infrastructure of anonymization services, including residential proxy networks that other providers miss. They are particularly strong at identifying compromised residential IPs used as proxy exit points.
Strengths:
- Best-in-class residential proxy detection
- Deep threat intelligence — maps entire proxy provider infrastructure
- Original research that informs detection (APT campaigns, proxy services)
- Identifies the specific anonymization service, not just the type
Considerations:
- Higher entry price ($150/month) — not ideal for small projects
- No numeric risk score — uses category-based classification
- More focused on threat intelligence than general-purpose fraud prevention
IPinfo
IPinfo is a popular IP data platform known for geolocation, ASN data, and privacy detection. Their Privacy Detection API identifies VPNs, proxies, Tor, and hosting providers. It is a solid all-around IP data provider with a generous free tier.
Strengths:
- Generous free tier (50,000 requests/month)
- Fast response times and reliable infrastructure
- Combines geolocation, ASN, company, and privacy data in one platform
- Clean, well-documented API
Considerations:
- No risk scoring — only binary VPN/proxy/Tor/hosting flags
- Privacy detection is one module among many, not their core focus
- Limited residential proxy detection compared to specialists
ipapi.is
ipapi.is focuses on technical accuracy and transparency. They publish detailed blog posts about their detection methodology and provide honest accuracy benchmarks. Their API covers VPN, proxy, Tor, and datacenter detection with a straightforward pricing model.
Strengths:
- Lowest starting price ($19/month) with generous free tier
- Transparent about methodology and accuracy
- Fast response times (<50ms)
- Good technical documentation
Considerations:
- No risk scoring — binary detection only
- Smaller team and less enterprise support infrastructure
- Limited residential proxy detection
Fingerprint
Fingerprint (formerly FingerprintJS) is primarily a device identification platform. Their VPN detection is a feature within their broader Smart Signals product, which combines browser fingerprinting with IP intelligence. Best suited for teams that want device fingerprinting and VPN detection in one integration.
Strengths:
- Combined device fingerprinting + VPN detection in one SDK
- Client-side detection catches WebRTC leaks and timezone mismatches
- Strong bot detection capabilities
- Well-funded company with active development
Considerations:
- Expensive ($200/month starting) — overkill if you only need IP detection
- Requires client-side JavaScript for full functionality
- VPN detection is an add-on, not the core product
- Higher latency for IP-only checks compared to dedicated API providers
Pricing Breakdown
Pricing varies significantly across providers. Some charge per request, others by monthly volume tiers, and some bundle IP detection with broader fraud tools. Here is a comparison at common volume levels:
| Provider | 10K req/day | 100K req/day | Unlimited | Overage Model |
|---|---|---|---|---|
| VPN Signal | $29/mo | $99/mo | $299/mo | Hard cap (no surprise bills) |
| IPQS | $49/mo | $199/mo | Custom | Overage charges apply |
| MaxMind | ~$100/mo | ~$750/mo | Custom | Per-query pricing |
| Spur | $150/mo | $350/mo | Custom | Tiered plans |
| IPinfo | $99/mo | $249/mo | Custom | Overage charges apply |
| ipapi.is | $19/mo | $79/mo | Custom | Hard cap |
| Fingerprint | $200/mo | $500/mo | Custom | Per-identification pricing |
Watch out for hidden costs. Some providers charge extra for specific features like residential proxy detection, detailed response fields, or webhook integrations. Always check what is included in the base price versus what requires an upgrade.
Which API Should You Choose?
The best VPN detection API depends on your specific needs. Here are our recommendations based on common scenarios:
Best for startups and growing apps
VPN Signal — Simple pricing, fast integration, and built-in risk scoring. Start free and scale to $29/month as you grow. No overage charges means predictable costs.
Ideal when: You want VPN/proxy detection with risk scoring without complexity.
Best for comprehensive fraud prevention
IPQualityScore — If you need IP detection, email verification, phone validation, and device fingerprinting in one platform, IPQS offers the most complete fraud prevention suite.
Ideal when: You need a full fraud stack, not just VPN detection.
Best for residential proxy detection
Spur — If residential proxies are your primary concern, Spur's threat intelligence approach provides the deepest visibility into residential proxy networks.
Ideal when: You face sophisticated fraud using residential proxies and need threat intelligence.
Best for enterprise with local deployment needs
MaxMind — If you need downloadable databases for zero-latency local lookups or air-gapped environments, MaxMind is the only major provider offering this option.
Ideal when: You need local database deployment or have strict data residency requirements.
Best budget option
ipapi.is — Starting at $19/month with a generous free tier, ipapi.is offers solid VPN/proxy/Tor detection at the lowest price point. Lacks risk scoring but covers the basics well.
Ideal when: You need reliable detection on a tight budget.
Best for combined device + network detection
Fingerprint — If you want device fingerprinting and VPN detection in a single SDK with client-side capabilities, Fingerprint combines both layers of detection.
Ideal when: You need both device fingerprinting and IP intelligence in one integration.
Our Recommendation: Test Before You Commit
Regardless of which provider looks best on paper, test at least 2-3 APIs against your real traffic before making a decision. VPN detection accuracy varies based on your specific traffic mix and geographic distribution. Most providers offer free tiers or trials — use them.
For a deeper understanding of the technical approaches behind VPN detection, read our complete guide to VPN detection. To learn more about risk scoring and how it improves fraud prevention outcomes, see our risk scoring documentation.