What a JavaScript browser check is
What Metrica does when JavaScript and Referer are both missing, how active collection in the browser differs from a request header, and why the absence of a script cannot be the only refusal.
6 min read
Blog
Articles about protecting ads from bots and click fraud
Bots and technology
What User-Agent is and why you cannot trust it
What the HTTP User-Agent header says about the program, why browsers trim it, how Google asks you to verify a robot by something other than the string, and why one header is not enough to decide a visit.
6 min read
Protection in ad accounts
Daily budget and limits: how not to burn through the morning
Which daily ceiling a Yandex Direct weekly budget sets, when changing the budget restarts spend, how underspend carries over, and why impressions can stop in the morning because a sum is frozen for review.
8 min readHow to pass CRM data into Metrica and see real sales
Why a CRM is uploaded to Metrica, which deadlines yclid and an order edit have, how a value for advertising cost share differs from a payment fact, and why the CRM still shows visits Direct has already filtered.
6 min readHow to set up offline conversions in Yandex Direct
Where Direct puts offline conversions, which identifiers are written into a visit, why yclid has 21 days, and how a manual link differs from the last visit.
6 min readRetargeting and bots: why audiences get polluted
Which ready-made Yandex Direct retargeting segments include bounces and ad traffic, why several goals must happen in one visit, and how many minutes a segment takes to catch a person.
6 min readInvalid clicks in VK Ads: how to find them and cut them off
What the VK Ads help pages do not say about invalid clicks, how the second-price auction and eCPM work, and what “click verification” actually does.
6 min readBid adjustments: how to cut suspicious segments
Yandex Direct adjustments run from −100% to +1,200%, how they change average click and conversion price, and why −100% on smartphones removes more than apps.
6 min readHow to limit impressions in Yandex Advertising Network mobile apps
How to block apps on a Yandex Direct placement list, how that list differs from a −100% smartphone adjustment, and which limits the help sets for domains and impression places.
5 min readHow to keep one list of blocked placements
Where a placement block lives in Yandex Direct, how the banner limit differs from the limit in the networks FAQ, and why the help does not describe an account-wide list. Alongside, how placements are chosen in VK Ads.
6 min read
Metrics and calculations
Attribution and attribution models in Metrica
Which four attribution models remained in Metrica from 20 May 2026, how the same path of four visits is split differently, and why spend is matched to a campaign rather than written into the visit.
6 min readHow to calculate lead cost when applications include spam
Why Metrica’s expenses report does not subtract spam from CPA, how a goal visit differs from every form submit, and how a CRM upload separates a lead with a status from a form fill.
6 min readUnit economics of advertising: how to tell that a channel pays off
How Yandex Direct calculates profit from conversion value, how the glossary ROI differs from Metrica’s ROI, and which weekly budget the help recommends before a channel can be judged at all.
7 min readWhat LTV is and why fraud distorts the estimate
Where Metrica shows long-term value even though the page never says LTV. How a cohort differs from Retention, and how robot visits change bounces and depth in the slice you use to compare sources.
5 min readWhat advertising cost share is and how to calculate it
In the Yandex Direct glossary, advertising cost share is spend relative to the revenue it brought, measured in percent. How Metrica calculates it, how it differs from ROI, and what a strategy limit needs you to pass.
6 min readWhat CPL is and how it differs from CPA
In Yandex Direct and Metrica help, the price of an action is called CPA, and the abbreviation CPL is not defined. How a report’s actual CPA differs from the strategy price, and which four CPAs sit in the expenses report.
5 min readWhat CPC is and what the click price depends on
In Yandex Direct, CPC is the click price actually charged under the auction rules. What it depends on in search and in the networks, how the average differs from the bid, and why the charged price can exceed the bid.
6 min read
Analytics and solutions
Why manual click-fraud protection does not scale
Why Yandex Direct’s help calls manual placement review irrational, advises against blocking impressions by IP, and how geotargeting looks beyond the person’s current point.
6 min readDoes bot protection affect SEO and real visitors
How robots.txt, Google crawlers, and Yandex robots relate to site access, which Core Web Vitals thresholds Google sets, and what the Binetro script does when a check does not answer.
6 min readHow to install bot protection on a site
What happens after you install the Binetro script. One check per visit, a retry after the computational task, a pass-through when the response fails, and the cases where the check never starts.
7 min read