Best IP Geolocation APIs for Fraud Detection and Access Control in SaaS Applications

Introduction

Most "best IP geolocation API" lists are written for someone who wants to show a visitor's city on a weather widget. SaaS teams have a different problem. You need to know whether the person signing up for a free trial is really in Germany, or whether they're the fifteenth "new user" this week coming from the same datacenter range through a commercial VPN.

That changes what you should judge a provider on. A lookup that returns a country and a pin on a map is only half the job. For fraud and access control, the response also has to tell you what kind of network the request came from and whether the IP is hiding anything.

In this guide we compare six providers SaaS teams evaluate most often: Greip, IPinfo, MaxMind, ipdata, ipstack, and ipapi.co, plus IP2Location as a bonus. Yes, we built Greip, so we've ranked it first. We've tried to be straight about where the others are stronger, because picking the wrong API costs you more than any blog post is worth.

What Actually Matters When You Pick an IP API for SaaS Security

Before the rankings, here's the scorecard we used. Each item maps to a decision your signup or login flow has to make, usually in a few milliseconds.

Accuracy, anonymity signals, and pricing shape that scorecard. Country-level accuracy is good across the industry. City-level accuracy varies a lot more, and it matters if you enforce regional licensing or price by region. VPN and proxy detection is the big one for fraud. Without it, geo restrictions and location-based risk checks are easy to get around. ASN and network intelligence matter too: knowing whether an IP belongs to a residential ISP, a mobile carrier, or a hosting provider tells you a lot about intent.

Some APIs return a single risk score. Others return individual flags (Tor, relay, blacklist, hosting). Flags are often easier to write rules against. Documentation and developer experience count because you'll be calling this API on hot paths like signup and login. And pricing has to fit SaaS volume. Watch for security features that are only on enterprise tiers, and for overage fees that spike when a bot wave hits your signup page.

Keep these in mind as you read. A provider that's great on accuracy but locks VPN detection behind a much pricier plan can end up costing more than one that looks expensive at first.

IP Geolocation APIs Compared at a Glance

The table is a quick reference based on each provider's public pricing pages when we wrote this. Plans change, so check current terms before you commit.

The pattern is clear. Almost everyone does basic location well. The real differences show up in how much you pay before VPN detection and network context switch on.

1. Greip: IP Intelligence Built for SaaS Fraud Stacks

Greip was built around a simple idea: an IP lookup for a SaaS product should answer "is this a risky request?" as well as "where is this request?" That's why the security data ships with the location data instead of being sold as a separate premium add-on.

One call to Greip's IP Location Intelligence returns country, city, timezone, currency, and network context. The security module adds flags for VPNs, proxies, Tor exit nodes, bots, relays (including Apple Private Relay), hosting and datacenter ranges, and blacklisted IPs. Greip says its geo accuracy reaches up to around 95%, and in practice the security flags are what most SaaS teams end up writing rules against.

Why it fits SaaS signup and login flows

Look at a typical trial abuse pattern. Someone creates account after account, each with a new email, all coming from rotating VPN endpoints or cheap cloud servers. Location alone won't catch that, because the location looks different every time.

With VPN and proxy detection in the same response, you can write a rule like "if the IP is a hosting provider or a known VPN, require phone verification before the trial starts." That's one lookup and one rule, with no second vendor involved.

Pricing and plans

Greip's pricing is designed so you don't have to upgrade to an enterprise tier just to see whether a request is coming through a proxy.

Standard is $29/month (about $24.17/month billed annually) with 170K requests. Premium is $89/month (about $74.17/month billed annually) with 400K requests and adds ASN lookup. Pay-as-you-go is usage-based and also includes ASN lookup.

VPN and proxy detection is on Standard, Premium, and pay-as-you-go. If you need deeper ASN details for network-level rules, the ASN and Network Intelligence service is on Premium and PAYG. Full details are on the pricing page.

Where Greip isn't the obvious winner

It's fair to say Greip doesn't win every row in the table. IPinfo's Core plan starts slightly cheaper on annual billing and is a more recognized brand in IP data. MaxMind is still the go-to if you need fully offline databases on your own servers. And Greip's trial is short: three days with 1,000 requests, which is enough to test your integration but not enough to run a long evaluation on live traffic.

Best for: SaaS teams that want geolocation and VPN/proxy detection from one API at a mid-market price, without paying extra for the security features.

2. IPinfo: The Name-Brand Choice With Strong Privacy Detection

IPinfo is probably the best-known name in IP data, and for good reason. Its datasets are widely used, the docs are clean, and the API is easy to get running in an afternoon.

For SaaS security, the important detail is that IPinfo's Core plan (from $26/month billed annually, with a starting tier of around 150K requests) includes privacy detection. That covers VPN, Tor, proxy, and relay flags, plus city-level geo and ASN data. It's a solid package and a real competitor to Greip at the same price.

Where it shines and where it costs more

The free Lite plan is useful for country-level checks, but it only returns country and continent, and commercial use requires attribution. That's fine for basic geo-routing, but it won't stop fraud on its own.

The Max plan ($163/month) adds richer privacy data, including residential proxy detection. Residential proxies are among the hardest kinds of traffic to catch, so if they're a big problem for you, Max is worth considering. It's a big jump in price from Core, though.

Best for: Teams that want a well-known provider with privacy detection on mid-tier plans, and that may eventually need residential proxy data.

3. MaxMind GeoIP: The Industry Standard for Local Databases

MaxMind has been around longer than most of the companies on this list, and its GeoIP data powers a lot of the internet. If someone on your team says "just use MaxMind," it's usually because they've used it before and trust it.

MaxMind's main strength is flexibility. You can download GeoIP databases and run lookups locally with no network call, or use its paid web services. Local lookups are extremely fast and don't depend on a third-party API being up, which matters a lot for latency-sensitive login flows.

The tradeoff for fraud use cases

Basic GeoIP data tells you where an IP is. For SaaS fraud you usually need more than that, which means MaxMind's anonymizer and proxy data in higher-tier products, or its separate minFraud service for transaction risk scoring. Pricing depends on the product, with database licenses, usage-based web services, and sales conversations for some offerings.

The free GeoLite databases are popular for side projects and early prototypes. They're less accurate than the paid versions and come with license terms you should read before putting them in production.

You also take on maintenance. Self-hosted databases have to be updated regularly, and stale data is a quiet way for detection quality to slip.

Best for: Teams that want offline lookups, a mature ecosystem, and are fine putting several MaxMind products together for full fraud coverage.

4. ipdata: A Clear Upgrade Path to Fraud Features

ipdata gets less attention than IPinfo or MaxMind, but its pricing is one of the easiest to read. Each tier adds a clear set of features, and there are no overage charges, which is reassuring if a bot attack ever floods your signup endpoint.

The free plan is generous for testing: 1,000 city-level lookups per day, then unlimited country-level lookups, with no API key needed on the free path. Commercial use on the free tier requires attribution.

What each tier unlocks

The paid tiers map well to how SaaS security needs tend to grow.

Startup is $50/month billed yearly, with 50K requests per day, ASN data, company data, and OSINT blocklists. Business is $120/month billed yearly and adds VPN detection, IP reputation scores, and commercial blocklists.

The catch is that VPN detection doesn't start until the Business tier. If VPN abuse is your main problem, you're looking at $120/month billed yearly. That's more than you'd pay for VPN detection with Greip or IPinfo Core, though you do get reputation scoring and commercial blocklists with it.

Best for: Teams that like predictable billing with no overages and want reputation scores and blocklists bundled with VPN detection.

5. ipstack: Quick to Integrate, but Security Costs Extra

ipstack is part of the APILayer family, and it feels like it. Signup takes a minute, the docs are simple, and you can get a working lookup almost right away. For basic location data, it's one of the cheapest paid options around.

The Basic plan is $12.99/month for 50K requests and includes location data plus timezone and currency modules. The free plan gives you 100 requests per month for non-commercial use, which is fine for kicking the tires and not much else.

Why it ranks lower for fraud

The security module, which covers VPN, proxy, and threat detection, is only on Professional+ and above. For a SaaS team whose main goal is stopping fraud, that means the cheap entry price isn't the real price. Compare the tier you'd actually need against the alternatives before you decide.

If you only need geo for personalization or simple country blocking, and you don't care much about people using VPNs to get around your rules, ipstack's lower tiers are a fair choice.

Best for: Location lookups on a budget, with fraud detection either not a priority yet or handled somewhere else.

6. ipapi.co: Simple and Affordable, With No VPN Flags

ipapi.co is popular with developers because it's very simple. You send an IP, you get back clean JSON with location, ASN, and organization data. The free testing allowance, roughly up to 1,000 lookups per day, makes it easy to prototype with.

Paid plans are affordable and give you enough volume for production geo and ASN lookups. If you need to know which country a request comes from and which network owns the IP, it does that job well.

The gap that matters for SaaS security

ipapi.co doesn't return VPN or proxy flags. For fraud and access control, that's a big gap. Anyone who wants to get around your geo restrictions just needs a VPN subscription, and the API won't tell you anything changed.

ASN data helps a bit, because you can flag known hosting providers yourself. But you'd be building and maintaining that logic by hand, which is exactly the work a dedicated VPN detection API saves you.

Best for: Geo and ASN lookups for analytics, localization, or routing, where you aren't relying on the IP to catch fraud.

7. IP2Location: A Database Veteran With Tiered Security Data

IP2Location is a long-standing database vendor, and its API is available through IP2Location.io. Like MaxMind, it appeals to teams that want the option of downloadable databases alongside a hosted API.

Basic geolocation and ASN data are on the lower plans. VPN and proxy detection, along with a fraud score, are on the higher Plus and Security tiers, and those can cost a lot more than the entry geo plans. If you're comparing it with the others, price out the tier that includes the security data you need, not the starting tier.

Best for: Teams that already use IP2Location databases or want a database-plus-API option outside the MaxMind ecosystem.

How SaaS Teams Put These APIs to Work

Once you've picked a provider, the value comes from the rules you build on top of it. Here are the three use cases we see most often, with how IP data fits into each.

Geo restrictions and compliance. If your licensing, sanctions compliance, or pricing depends on region, country-level geo is the base. Pair it with VPN and proxy flags, or a blocked user can get through in seconds. A good rule is to block or challenge only when a restricted country and an anonymizer show up together.

Account takeover (ATO) prevention. A login from a new country, a hosting provider, or a Tor exit node right after a password reset is a classic warning sign. Rather than blocking outright, many teams use these signals to trigger step-up checks like an email confirmation or 2FA prompt.

Free trial abuse. Repeat trial abusers tend to come from datacenter IPs, VPN endpoints, and the same few networks over and over. ASN data and hosting flags let you group these signups and add friction, such as phone verification or a card check, only for the risky ones.

The common thread is that you rarely want to hard-block on IP data alone. It works best as one strong signal in a layered decision, so real users on corporate VPNs or travelling for work don't get locked out.

Conclusion

The best IP geolocation API for a SaaS app isn't the one with the prettiest map. It's the one that tells you, in a single fast call, where a request came from and whether it's hiding something. That's the bar we used for this ranking.

Greip comes first because it puts VPN, proxy, Tor, relay, and hosting detection on every paid plan at a mid-market price, which matches how SaaS teams actually fight signup fraud and trial abuse. IPinfo is a strong runner-up with privacy detection on its Core plan. MaxMind is still the pick for offline databases, and ipdata is a solid choice if you want reputation scores with no overages. ipstack and ipapi.co are fine for basic geo, but think carefully before relying on them for security.

If you want to see how Greip handles your own traffic, start the 3-day trial, look through the GeoIP lookup documentation and the VPN and proxy detection option, and compare plans on the pricing page. Point a few real signups at it and see what it flags.