Compare cost per successful request, not just price per GB
Per-GB prices leave out failure rates. Proxy traffic is metered in bytes, not results: Bright Data counts request and response headers and data in both directions, so a blocked response still uses paid traffic. Buy a small amount, run it against your own targets and divide the spend by the pages you got back. Decodo's pay as you go costs $4 per GB, and IPRoyal sells a 1 GB pack for $7.35. The Web Scraper API products from Bright Data and Oxylabs work differently and charge only for successful results.
Match the proxy type to the target
Datacenter IPs cost the least, and sites recognize them more easily: Decodo's shared datacenter traffic runs $0.45 to $0.60 per GB, against $2.75 to $4 for its residential traffic. Residential IPs come from household connections and mobile IPs from carrier networks, and both cost more. Start with the cheapest type that works on a target and move up only where it fails.
Ask where the IPs come from
Residential and mobile IPs run over real people's connections, so ask how those people consented. Bright Data describes opt-in through partner apps, a consent screen, a two-click opt-out and compensation for participants, and Decodo says peers give explicit consent before their traffic is shared. IPRoyal names users of its Pawns.app application and provider partners as sources without describing the consent step. Ask for the sourcing document and check that it covers both opting in and opting out.
Know your legal position before you scale
What's allowed depends on what you collect, where you operate and each site's terms, and personal data can bring obligations under laws such as the GDPR even on a public page. Providers screen use cases too: Bright Data limits residential traffic to the approved use case, and Decodo blocks banking, government, streaming, app store and ticketing sites. Get legal advice before building a business on collected data, not after a complaint arrives.