Price monitoring and data collection: when a mobile IP is worth it

Tracking a competitor's prices, a market's listings, a sector's rates: this is collecting public data. A mobile IP is sometimes essential for it, often unnecessary. Here is how to decide before paying.

The right tool for the target

Proxy type	Strengths	When to choose it
Datacenter	Fast, cheap, available in large numbers	The target tolerates bots or does not filter them
Residential (shared network)	Thousands of addresses, many countries	Large volumes, wide geographic coverage
Dedicated mobile	Carrier address, very rarely blocked wholesale	The target blocks datacenter and residential, or serves a different mobile version

Start with the cheapest option that works. A mobile line means one address at a time and the throughput of a 4G/5G line: it is not made for pulling millions of pages a day. It is for when nothing else gets through.

Sector by sector

Travel (flights, hotels, rentals). Prices and availability can vary by country and device. Do not assume it: measure it, by comparing a fixed-line connection and a mobile connection at the same moment.

Real estate and cars. Listing sites are among the best protected. Listings from private individuals contain personal data: name, phone number, sometimes the address. See the legal framework below.

Retail and click-and-collect. The displayed price often depends on the chosen store, so on the postcode entered on the site, not on your IP address. A mobile IP changes nothing there; the choice of store does.

Search results. Mobile rankings differ from desktop rankings. A French mobile connection shows them as your customers see them; geolocation of mobile addresses remains approximate (often "Paris" or the carrier's region).

Tuning the collection

Pace. One request every few seconds, per address, looks like reading. A hundred per second looks like an attack, whatever the address.

Rotation. Change IP through the API or the rotation link between two batches of requests, not in the middle of a session. See Changing your IP.

Parallelism. A line gives one address at a time. For several parallel streams, take several proxies rather than loading a single line.

DNS resolution. With SOCKS5, ask for resolution through the proxy (socks5h:// in most libraries), otherwise your DNS requests go out through your own connection.

The legal framework

This is not legal advice, but three reference points apply in France and Europe:

The site's terms of use and its robots.txt file say what it accepts. A proxy does not make a forbidden collection authorized.
Personal data falls under the GDPR, even when it is public. The CNIL (the French data protection authority) has published recommendations on web scraping: read them before collecting listings from private individuals.
Database rights protect a database's producer against the extraction of a substantial part of its content. Recording prices is not copying an entire catalog.

Which plan

Collection is the use for which rotation matters: a plan with unlimited rotation and data is the natural choice. A fixed address with a data quota is a poor fit, except for light monitoring of a few pages a day.

FAQ

How many requests a day on one line?

It depends on the target far more than on the line. Start slowly, measure the refusal rate, and ramp up gradually. If you need industrial volumes, a residential network is better suited.

Do I need a browser or a simple HTTP library?

An HTTP library is enough for pages served as they are. Sites that build their page in JavaScript need an automated browser: see AI agents and automated browsers.