Best Proxy for LLM-Based Web Scraping Agents: What Actually Matters at Production Scale

LLM-based web scraping agents have different infrastructure requirements than traditional scrapers. A human clicking through pages tolerates slow retries and occasional failures. An agent running hundreds or thousands of requests per session does not — every failed request compounds, either in cost, latency, or both. Choosing the wrong proxy setup is one of the fastest ways to burn through a budget before the agent produces useful output.

Here is what actually matters when evaluating proxies for this use case, and how to think through the tradeoffs.

Residential IPs over datacenter IPs, almost always

LLM agents tend to hit the kinds of pages that have meaningful anti-bot protections: news sites, e-commerce, research databases, LinkedIn-style directories. Datacenter IPs are trivially fingerprinted by most modern bot detection systems. Residential IPs route through real consumer devices and are dramatically harder to block at the network layer. The tradeoff is cost per gigabyte — residential bandwidth costs more than datacenter bandwidth. For agents doing structured extraction on hard pages, that cost is worth paying because the alternative is a high failure rate that forces retries, which compounds total cost anyway.

Per-request rotation vs. sticky sessions

Most agents benefit from per-request IP rotation as the default. Each HTTP call goes out from a fresh IP, which minimizes the fingerprint surface across a session. However, some workflows require session continuity — logging into a site, maintaining a shopping cart state, or paginating through results that are session-scoped. For those cases, sticky sessions that hold a single IP for a defined window (up to 30 minutes is a reasonable upper bound) let the agent maintain state without triggering anomaly detection from rapid IP switching mid-session. The ability to switch between these two modes programmatically, via a session ID in the proxy username string, is more useful than it sounds — it means the agent can choose the right behavior per task without changing infrastructure.

Protocol support matters for agent frameworks

A surprising number of agent frameworks and HTTP clients default to SOCKS5 for proxy connections, not HTTP. If your proxy provider only supports HTTP, you will spend time patching library calls. Both HTTP and S