- Data analytics
- Proxy infrastructure
The proxy buying guide: 12 questions to ask before signing
Use this proxy vendor evaluation checklist to pressure-test providers on network size, IP sourcing, compliance, pricing models, and rotation logic.
Table of contents
Evaluating a proxy provider goes beyond comparing cost per gigabyte on a pricing page. When you run millions of requests daily, success depends on underlying network architecture, IP sourcing compliance, and routing logic. Use this proxy buying guide to pressure-test vendors and secure the right infrastructure before you commit to an enterprise contract.
Sourcing and compliance
Your scraping operations carry legal and reputational risks if your provider uses compromised networks. Compliance should be the first filter in your proxy vendor evaluation.
1. How do you acquire your IPs?
Providers typically source IPs through user SDKs embedded in free applications. You need to know if users explicitly opted into sharing their bandwidth. Ask to see the consent flows. If a provider cannot explain their exact compensation or consent model, their network likely relies on botnets. Legitimate residential proxies originate from real users who receive ad-free experiences or premium app features in exchange for a fraction of their idle bandwidth.
2. Do you enforce strict KYC and abuse prevention?
A network is only as clean as its worst users. If a vendor allows anonymous sign-ups with crypto payments and no identity verification, their IP pools are heavily abused. This means the IPs you rent will already be blacklisted by major CDNs like Cloudflare or Akamai. Ask about their Know Your Customer protocols and how they handle abuse complaints.
Network size and targeting precision
Marketing pages often advertise massive IP pools. You need to translate those marketing numbers into actual concurrent availability for your specific use case.
3. What is the active pool size in my target regions?
A provider claiming 100 million IPs usually counts every unique IP seen over a 30-day period. This metric is useless for your daily operations. Ask for the average number of concurrently active devices in your specific target countries at your peak scraping hours. A smaller active pool with high availability beats a massive pool of offline devices.
4. Are your datacenter IPs shared or reserved?
If you run high-frequency scraping against lenient targets, datacenter IPs offer the best speed. However, shared pools mean you are at the mercy of other customers triggering blocks. If your workflow requires clean histories, ask if they provide exclusive datacenter IPs that are entirely isolated from other tenants.
5. Can I target specific cities or ASNs out of the box?
E-commerce pricing and search engine results change based on localized IPs. Standard plans often limit you to country-level targeting. If you need granular data, ask if they support country, city, and ASN level targeting natively via API or gateway settings, and verify if this incurs an additional multiplier on your bandwidth cost.
Performance and routing logic
Uptime on a status page rarely reflects the actual latency of your proxy requests. You need to understand how the provider handles request routing under load.
6. What are your concurrency and thread limits?
Many providers impose hard limits on concurrent connections to protect their load balancers. If your architecture relies on firing thousands of asynchronous requests, a concurrency cap will result in HTTP 429 Too Many Requests errors from the proxy gateway itself. Clarify your maximum allowed connections per second.
7. How long can a static IP hold a session?
Certain scraping workflows require logging into accounts or maintaining a shopping cart state. Mobile and residential IPs naturally disconnect when a device turns off or switches networks. Ask the vendor about the maximum Time-To-Live for sticky sessions and what fallback mechanisms trigger when an IP drops mid-session.
8. Do you support custom rotation rules?
Basic proxy gateways rotate IPs on every request or after a fixed time interval. Advanced scraping requires conditional rotation. For instance, you might want to keep an IP unless the target returns an HTTP 403 Forbidden or an HTTP 407 Proxy Authentication Required. Ask if they offer custom infrastructure with dedicated pools where you can define exact rotation logic based on target responses.
Pricing models and hidden costs
Enterprise proxy pricing is rarely transparent. You must model your costs based on your specific traffic patterns to avoid billing surprises.
9. Do you charge by bandwidth, requests, or successful requests?
Bandwidth pricing is standard, but highly inefficient if you scrape media-heavy pages. Stripping images and CSS helps, but some target servers force full page loads. Ask if they offer a pay-per-successful-request model. This shifts the failure cost onto the provider, meaning you do not pay for bandwidth consumed by failed CAPTCHAs or blocked requests.
10. What are the penalties for overages?
Scraping volume can spike unexpectedly. Ask what happens when you exceed your monthly commitment. Some providers hard-stop your traffic, which breaks your pipelines. Others auto-renew your plan or charge punitive overage rates per gigabyte. Ensure their billing API allows you to set programmatic usage caps.
Support and integration
When target sites update their anti-bot measures, your success rate will drop. The speed of your provider's support team becomes a critical operational metric.
11. What is your actual SLA for proxy latency?
Vendors guarantee 99.9% uptime for their gateway servers, but that does not cover the latency of the proxy nodes themselves. Ask for Service Level Agreements that guarantee sub-second response times for a specific percentage of requests. Ensure you understand how they measure and report this latency.
12. Do we get a direct technical channel?
Waiting 24 hours for a level-one support agent to reply to a ticket is unacceptable when your production pipeline is failing. Ask if enterprise plans include a shared Slack or Microsoft Teams channel with direct access to network engineers who can actually debug routing issues or adjust your IP pool configurations.
How to structure your evaluation
Never sign a long-term proxy contract based on marketing claims. Take this proxy provider checklist and require vendors to answer these questions in writing. Once you filter out the incompatible providers, run a controlled proof of concept. Send traffic through their network using your actual scraping scripts against your actual target sites. Measure the success rate, average latency, and bandwidth consumption over a period of at least seven days.
If you need help sizing the right proxy stack for your use case, talk to our team.
