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The page check uses a four-point score to explain which rental-listing signals it detected, but a separate rule makes the decision. A page qualifies only when the check finds a price and at least one of an address or a contact option. That distinction helps prevent a plausible-looking score from standing in for the specific evidence the rule requires.

What the four-point score measures

The check adds points for three signals: a detected price is worth two points, an address is worth one, and a contact option is worth one. The maximum is four. These weights describe the implementation; they are not an externally validated measure of how likely a page is to be a genuine rental listing.

Detected signal Points Role in the decision
Price 2 Required
Address 1 Corroborating; either address or contact is required alongside price
Contact option 1 Corroborating; either contact or address is required alongside price

The price patterns described by Daniel Pertu include currency symbols, currency words and rent-related terms in several languages. Address patterns include examples from Dutch, German, Spanish, French and British contexts. A contact affordance is another supporting signal, such as a way to reach the listing poster.

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The decision is a rule, not a score threshold

In boolean terms, the described decision is: priceDetected && (addressDetected || contactDetected). The check does not ask whether the total reaches a particular number. It asks whether the required price signal is present and whether at least one corroborating signal is present.

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  • Price plus address: qualifies under the rule.
  • Price plus contact: qualifies under the rule, even if a full address was not detected.
  • Address plus contact without price: does not qualify, even though those signals add up to two points.
  • Price alone: does not qualify, despite contributing two points.

A threshold would blur the meaning of different signals. For example, address and contact without a rent price could describe an agency page rather than an individual listing. Meanwhile, a sparse but genuine listing might show a price and contact button without exposing a clearly detectable full address. The rule treats price as necessary evidence and address or contact as supporting evidence, instead of assuming those signals are interchangeable.

Why return the score if it does not decide?

The score is diagnostic: when the rule refuses a page, the returned detail can show which signals were found. That gives someone investigating the refusal more context than a bare yes-or-no result. It does not alter the result. As Pertu puts it, “The number is diagnostics, not a decision.”

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This separation is useful when the system needs both a stable decision and an explanation a person can inspect later. A human-readable rule is easier to reason about than an unexplained cutoff, while the score can still summarize the detector’s observations.

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Why the listing check runs after other safety checks

Listing shape is only the last of seven checks in the described sequence. The order prioritizes other reasons a page should not be handled, so an earlier problem is not misreported as “not a listing.”

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  1. Domain lock
  2. Payment-page check
  3. Anti-bot wall
  4. Expired session
  5. New-account requirement
  6. Paid-plan requirement
  7. Listing-shape check

Each refusal condition maps to a distinct recorded status. For example, if a session has expired, that status is more informative than saying the page lacks listing signals. The article also describes a skipListingCheck escape hatch for a contact form reached after the listing page has already passed the shape check; the earlier guards still apply.

Specific markers help avoid keyword collisions

Payment-page detection illustrates why a safety check should look for evidence tied to the condition rather than broad words. The described implementation looks for payment-provider script hosts and card-field attributes, not generic payment-method terms. A broad search for “iDEAL” could confuse the Dutch payment method with Idealista, a Spanish property portal, and falsely reject a property page.

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Address detection has a different trade-off. A broad five-digit postcode pattern can match text that is not actually an address. In this particular rule, address is only corroboration, not proof by itself; that limits the role of a loose match. It should not be taken as evidence that the same pattern is safe when an address is the sole basis for a consequential decision.

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When this design makes sense

This approach fits a system that wants a conservative, explainable gate before automation sends a message on a third-party page. It keeps the actual decision tied to a required signal and a second, supporting signal, while preserving a compact diagnostic summary for refusals. The design rationale is Pertu’s implementation choice, not an independently established standard or a reported performance result.

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