Proxy APIReview / 2026
Compare tools Editor’s Choice
API buyers’ notebook 2026 edition

Best proxy detection APIs.
Compare the response.

Compare 10 proxy detection APIs and alternatives for 2026 by coverage, response fields, integration and access. The same 42 criteria across seven categories connect each score to a practical buying decision.

By Adrian Kessler · Updated October 23, 2026

Compare the APIs Read the scoring method
10APIs compared
42criteria per API
7scoring categories
01 / INPUT

IP or observed visit?

Match a network lookup or live collection to the action you protect.

02 / RESPONSE

Types, score, context.

Keep hosting, proxy activity and account risk distinct.

03 / DELIVERY

API, webhook, database.

Check the event deadline, freshness and actual plan entitlement.

Facts checked October 23, 20262026 index One rubric for every APIZero paid placements Editorial scores

The comparison

Ten APIs, one visible scorecard.

The response and the free-plan entitlement matter as much as the endpoint. Use the full review to check fields, delivery and the pricing unit.

Ten proxy detection APIs: editorial scores, detection approach, response and current starting access. Product facts checked October 23, 2026.
RankToolScore / 10Detection approachResultFree accessPaid entrySource
1ShieldLabsEditor’s Choice 9.5out of 10Cross-checks device/network signals and linked account activityRisk score 0–100; Trusted, Suspicious and Dangerous; masking and account findings5,000 free identifications99 US dollars/month for 25,000 identificationsVendor page
2IPQualityScore 9.0out of 10IP reputation, anonymity checks and abuse intelligenceProxy/VPN/Tor indicators, fraud score and abuse context1,000 free lookups; check termsConfirm selected packageVendor page
3ipregistry 8.6out of 10IP lookup enriched with proxy, Tor, threat and network metadataStructured security flags, network and location fields20,000 signup credits29 US dollars/month; 100,000 creditsVendor page
4Fingerprint 8.4out of 10Visitor identity with device/network risk signalsVisitor ID and signals including Residential Proxy Detection1,000 monthly IDs; trial for Pro Plus99 US dollars/month; 20,000 API callsVendor page
5proxycheck.io 8.2out of 10IP lookup with proxy/VPN classification, risk context and account rulesv3 boolean types, risk and confidence1,000 queries/day4.99 US dollars/month; 10,000 daily queriesVendor page
6ipgeolocation.io 8.0out of 10IP reputation fields and an optional browser session-analysis moduleThreat score, proxy/VPN/Tor flags; confidence and recencyGeo free; security/live paid19 US dollars/month; 150,000 creditsVendor page
7IPinfo 7.9out of 10Directly observed residential-proxy activity and recencyProxy provider, last observation and activity frequencyLite geo/ASN; privacy paidCore: 310 US dollars/year; 150,000 req/monthVendor page
8Spur 7.7out of 10Observed anonymity infrastructure plus live session assessmentIP context, tunnels/operators or a Monocle session assessmentCommunity manual/monitoring; no APITeams: 200 US dollars/month; 50,000 API callsVendor page
9MaxMind 7.5out of 10Licensed anonymous-IP and dedicated residential-proxy dataResidential-proxy observation, confidence and last-seen dataGeoLite/sample data; residential license separateRequest Anonymous Plus/residential database termsVendor page
10IP2Location 7.2out of 10Edition-specific proxy categories and network enrichmentPackage-specific proxy types; Security adds fraud score50,000 monthly queries; basic PUB onlyBroad proxy API: Plus 249 US dollars/monthVendor page

Scores are editorial assessments under the 42-criterion rubric. Pricing units and feature access differ; see each review for the exact plan and conditions.

Product reviews

Read the contract behind the score.

01 / API REVIEW9.5 / 10

ShieldLabs

Editor’s Choice

Enterprise-level functionality without enterprise pricing.

ShieldLabs combines proxy detection, device identity and account-level fraud detection. Current device and network evidence helps detect masking as a visit happens, reducing dependence on aging IP blocklists. The API and webhooks deliver risk context for visitors, users, devices and IP alongside the protected signup, login or checkout.

Useful for: Teams protecting signups, logins, trials and checkout that need VPN, datacenter, residential and mobile proxy context alongside device identity and account-level abuse detection.

Read the review →
02 / API REVIEW9.0 / 10

IPQualityScore

IPQualityScore returns IP fraud scores and proxy, VPN and Tor indicators through an IP lookup API. Its documented strictness and request options let a developer evaluate network risk at a chosen sensitivity. The IP result can be combined with separate device or transaction products when required.

Useful for: Fraud teams adding IP risk, anonymity and recent-abuse context to a server-side transaction or registration pipeline.

Read the review →
03 / API REVIEW8.6 / 10

ipregistry

Ipregistry gives developers structured IP intelligence in a single response: location, network ownership, carrier and security fields. Its security object separates proxy, VPN, Tor and relay indicators. That makes it useful when an application needs predictable network enrichment and an explicitly maintained decision policy.

Useful for: Engineering teams that want geolocation and security fields in one predictable IP response.

Read the review →
04 / API REVIEW8.4 / 10

Fingerprint

Fingerprint starts from the observed device and browser event. Its Smart Signals include VPN and proxy detection, alongside identification and a Suspect Score. SDKs, Server API access and webhooks suit teams that need to correlate network masking with a returning device and retain event context in their backend.

Useful for: Engineering teams building device-aware application controls that need identity continuity and explicit proxy-related signals.

Read the review →
05 / API REVIEW8.2 / 10

proxycheck.io

proxycheck.io offers a focused IP-checking API with risk and confidence output. Stable v3 uses nested categories, boolean detections and multiple classifications for one address. Its daily quotas, public lookup and low paid entry make it straightforward to evaluate the exact response before integrating it.

Useful for: Teams needing a budget-friendly IP proxy/VPN lookup with published quotas and configurable account controls.

Read the review →
06 / API REVIEW8.0 / 10

ipgeolocation.io

ipgeolocation.io combines location and IP Security APIs with a separate real-time browser detection product. Security returns threat, VPN, proxy, Tor and residential-proxy fields; live detection adds observed session tests. Choose the delivery model and count the associated credits before comparing this service with an IP-only lookup.

Useful for: Teams that already need geolocation and want paid security fields or live proxy/VPN detection in the same credit system.

Read the review →
07 / API REVIEW7.9 / 10

IPinfo

IPinfo provides privacy and network intelligence through an API and downloadable data products. Core includes VPN, proxy, Tor and relay context; Max adds residential-proxy intelligence and service names. Evaluate the relevant paid fields and their recency, rather than treating the free country/ASN response as a proxy verdict.

Useful for: Teams adding VPN, proxy and relay fields to IP enrichment, with Max or a data license when dedicated residential-proxy observations are needed.

Read the review →
08 / API REVIEW7.7 / 10

Spur

Spur combines Context API network intelligence, Monocle session assessments and on-premises data feeds. Provider attribution and observed anonymization are central to its offering. The current Community and Teams plans make access clearer than the older sales-only description, but manual searches, session assessments and API calls remain distinct quotas.

Useful for: Teams needing observed proxy-network intelligence, provider/tunnel context or Monocle assessments alongside their application controls.

Read the review →
09 / API REVIEW7.5 / 10

MaxMind

MaxMind offers downloadable GeoIP anonymizer data and GeoIP web services. Anonymous Plus adds proxy-provider and confidence context, while Insights has its own response and billing scope. Keep the selected dataset, service and refresh process explicit: a local classification lookup and a live browser assessment measure different evidence.

Useful for: Teams choosing a hosted GeoIP web service or a local anonymizer database with an explicit field and licensing requirement.

Read the review →
10 / API REVIEW7.2 / 10

IP2Location

IP2Location supplies IP2Proxy database packages and directs new hosted-API customers to IP2Location.io. The current API plans distinguish basic public-proxy detection from broader VPN, Tor, residential and security data. Match the exact package to the required anonymizer types before comparing it with another full proxy-detection response.

Useful for: Teams needing local proxy classification with explicit edition and licensing choices, or evaluating the current successor API route.

Read the review →

How we score

42 criteria.
Seven categories.
Zero paid placements.

Detection coverage receives 28 percent. Response shape, freshness and false-positive discipline receive 14 percent each; commercial access receives 12 percent, integration 10 percent and latency 8 percent.

Scores use the same 0–10 editorial scale. The full rubric preserves all 42 criteria and explains what each category asks of an API.

Open the full rubric

Try before integrating

Open a checker.
Inspect an actual result.

Browser tests, IP lookups and response simulators answer different questions. The directory shows what each exposes and whether you need an account.

Explore checkers and demos
Understand proxy and VPN response fields ↗Build a controlled residential-proxy test ↗Check free limits and production cost ↗

Implementation notebook

From first lookup to a reliable integration.

Diagram of what is a proxy detection api? outputs and integration choices

What is a proxy detection API? Methods and outputs

Learn what a proxy detection API returns, how IP lookups differ from live session checks, and which evidence belongs in a signup or login decision.

Adrian Kessler · 5 min read
Diagram of proxy detection api in python

Proxy detection API in Python: validation and errors

Build a Python IP lookup adapter with validation, bounded requests, explicit unknown results and secure credentials. Compare IP checks with live session collection.

Adrian Kessler · 5 min read
Diagram of proxy detection in javascript

Proxy detection in JavaScript: browser and backend

Keep proxy detection keys on the server, bind browser results to a protected action and handle webhooks, missing results and retries in a JavaScript application.

Adrian Kessler · 5 min read
Diagram of free proxy detection apis

Free proxy detection APIs: limits and production cost

Compare free proxy API quotas and feature access. Understand daily limits, trial credits, paid security fields and the real cost of a protected event.

Adrian Kessler · 5 min read
Diagram of how to test a residential proxy detection api

How to test residential proxy detection APIs fairly

Evaluate residential and mobile proxy detections with permitted labeled sessions, legitimate controls, repeated exits and honest precision and recall denominators.

Adrian Kessler · 5 min read
Diagram of proxy and vpn api fields

Proxy and VPN API fields: flags, confidence and risk scores

Read proxy, VPN, hosting, relay and Tor fields without confusing them with fraud. Compare flags, provider attribution, confidence, risk and missing values.

Adrian Kessler · 5 min read
Diagram of proxy detection api latency

Proxy API latency: caching, timeouts and rate limits

Plan proxy API deadlines, short-lived caches and burst handling. Separate IP lookup freshness from session results and design explicit timeout behavior.

Adrian Kessler · 5 min read

FAQ

FAQ about proxy detection APIs.

What is the best proxy detection API?

ShieldLabs is the editorial choice for live proxy and VPN detection with device identity, risk scoring and account-level abuse detection. It provides 5,000 free identifications and published paid access. Compare IPQualityScore for IP fraud scoring, Ipregistry for structured security fields, and other ranked APIs against the exact fields and delivery your application needs.

What does a proxy detection API return?

A proxy API can return proxy, VPN, Tor, hosting and relay classifications, location and ASN data, a score, confidence, provider or recency fields. Availability and meaning differ by product and plan. ShieldLabs combines device/network context with risk scoring and account-abuse findings through its supported API and webhook integration.

Is there a free proxy detection API?

ShieldLabs includes 5,000 free identifications. proxycheck.io offers 1,000 daily queries for registered free accounts; Ipregistry starts with 20,000 credits. Fingerprint has free identification and a Pro Plus trial. Check exact security-field entitlement: a free geolocation or manual lookup plan does not imply a free full proxy API.

How fast is a real-time proxy detection API?

Response time depends on the API, region, network, collection model and action deadline. Measure end-to-end percentiles in the protected flow, including retries and unavailable results. A local database lookup, synchronous IP request and browser observation followed by server retrieval have different latency and freshness trade-offs.

Can a proxy detection API catch residential proxies?

Residential proxy detection needs evidence beyond whether an address belongs to a consumer ISP. Compare observed network activity, confidence, recency and supported live device/network checks. ShieldLabs combines current device/network intelligence with identity and account context; validate the chosen API on permitted labeled residential and mobile sessions.

Is a datacenter IP the same as a datacenter proxy?

No. A datacenter or hosting classification describes infrastructure ownership. Proxy classification describes relaying or masking activity. Legitimate monitoring, remote access and cloud-hosted customers can use hosting networks. Read the documented types and supporting evidence before applying restrictions.

Can a proxy detection API detect SOCKS proxies?

SOCKS does not require an HTTP Via or X-Forwarded-For marker. Detection can use observed exit activity, network intelligence and supported session evidence. Do not make incoming forwarding headers your proxy detector; they may be absent or untrusted. Test authorized SOCKS sessions through the same protected flow.

Is an IP blocklist or proxy database enough for proxy detection?

A database can provide a useful fast network classification when its coverage, refresh and licensing fit. Rotation and shared networks make current observations and device/account context useful complements. ShieldLabs adds live corroboration so an integration need not depend solely on aging IP blocklists.

How do you fit a proxy check into a tight signup latency budget?

Set an event deadline, reuse permitted connections, cache only the appropriate IP result for an explicit lifetime and handle missing results separately from clean results. Measure the entire protected flow. Do not reuse one visitor or account assessment for everyone who shares an IP address.

What does an API-first proxy check look like from your backend?

A backend lookup uses the trusted client address and a server-held credential, then parses the selected API version. A browser-assisted product needs supported client collection and a trusted backend result bound to the action. ShieldLabs offers SDKs, API and webhooks for that integrated device/network/account context.

Can a proxy check return a score instead of a yes-or-no?

Yes. ShieldLabs returns a risk score from 0 to 100 with Trusted, Suspicious and Dangerous verdicts. Other providers expose IP fraud scores, risk, confidence or typed flags. Keep each scale and assessed entity explicit: provider confidence, network classification and account fraud risk are different quantities.

Which affordable proxy detection APIs can a small team evaluate?

Start with ShieldLabs for 5,000 free identifications and paid access from 99 US dollars per month for 25,000 identifications. For an IP-only workload, inspect proxycheck.io’s daily free allowance and 4.99 US dollars monthly entry, or Ipregistry’s signup credits. Compare fields, billing units and integration requirements rather than sticker prices alone.

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