Scroll Velocity Profile: Why Page Scroll Speed Is Key to Trust

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How fraud engines analyze acceleration, deceleration, and pauses during scrolling

Introduction: Cursor Body Language​

You visit a website. You scroll down. You pause to read the terms and conditions. You return to the top. You scroll again, more slowly, to examine the product.

This sequence isn't chaos. It's the user's body language, which fraud engines (Forter, Sift, Riskified) read like a book.

Every movement is a dot on the behavior map. And the entire session is a trust path.

If the path is logical, natural, and humane, the system says, "Welcome".
If it's direct, fast, and unhesitating, the system whispers, "Bot".

In this article, we'll explore how the Scroll Velocity Profile works, why it's critical for trust, and how to simulate natural scrolling.

Part 1: What is a Scroll Velocity Profile?​

Technical definition​

Scroll Velocity Profile is a graph of scroll speed over time, including:

• Acceleration (start scrolling),
• Maximum speed (peak traffic),
• Slowing down (approaching the target),
• Stops (pauses for reading).

This profile is unique to each person, like handwriting.

Key insight:
Fraud engines don't look at how much you scroll. They look at HOW you scroll.

Part 2: How Fraud Engines Analyze Scrolling​

Behavioral Metrics (2026)​

Modern systems monitor dozens of parameters:

Metrics	Real user	Bot
Acceleration	Smooth (0.5–1.5 sec before peak)	Instant (0.1 sec)
Max. speed	200–500 px/sec	1000+ px/sec
Slowing down	Smooth (0.3–1.0 sec)	Sharp (0.05 sec)
Stops	2–5 pauses (1–3 sec each)	No stops

Example:
Scrolling from top to bottom in 2 seconds, without stopping → fraud score = 90+

Part 3: Phases of Natural Scrolling​

Phase 1: Exploration (0–10 seconds)​

• Objective: To understand the structure of the page.
• Actions:
  • Fast scrolling down (speed up → peak → slow down),
  • Stop at the footer (1-2 sec),
  • Return to top.

Phase 2: Reading (10–40 seconds)​

• Objective: To study the details.
• Actions:
  • Slow scrolling (100–200 px/sec),
  • Stops at key locations (conditions, prices, reviews),
  • Pause 1-3 seconds on each block.

Phase 3: Confirmation (40–60 seconds)​

• Objective: To verify the solution.
• Actions:
  • Return to price or button,
  • Slow scroll up,
  • The final stop before departure.

Example:
Visitor logs into Steam → quickly scrolls to "Add Funds" → reads terms → returns to amount → confirms.

Part 4: How to Simulate Natural Scrolling​

Natural Scrolling Rules​

1. Acceleration: 0.5–1.5 sec to maximum speed,
2. Max. speed: 200–500 px/sec (no more!)
3. Deceleration: 0.3–1.0 sec before stopping,
4. Stops: 2–5 pauses of 1–3 seconds at key blocks.

Practical example​

• 0–5 sec: Fast scrolling down (speed up → peak → slow down),
• 5-8 sec: Stop at "Terms of Use"
• 8-15 sec: Slow scrolling up,
• 15–18 sec: Stop at “Total: $50”,
• 18–20 sec: Final scroll to the “Pay” button.

Result:
The system sees: “This is a person who thinks” → trust is increased.

Part 5: Setting Up Dolphin Anty / Linken Sphere​

Human Emulation Settings​

Parameter	Recommended value	Why
Scroll Acceleration	0.8–1.2 sec	Simulates a soft start
Max Scroll Speed	300–400 px/sec	Corresponds to a real user
Scroll Deceleration	0.5–0.8 sec	Smooth deceleration
Scroll Pauses	3 pauses of 1–3 seconds	Simulates reading

Pro Tip:
Enable "Natural Scroll Profile" in Dolphin Anty - it will automatically add stops.

Part 6: Why Most Carders Fail​

Common Mistakes​

Error	Consequence
Instant scrolling	Looks like a bot → high-risk score
Zero stops	No reading → ban
Too high speed	Doesn't correspond to human physiology → suspicion

Field data (2026):
87% of failures are due to lack of natural Scroll Velocity Profile.

Conclusion: Trust is built in movement​

Fraud engines don't care how much you scroll. They care how you scrolled.

Your Scroll Velocity Profile is your story.
And if it's written with pauses, accelerations, and decelerations, the system will believe, "This is a human".

Final thought:
True camouflage lies not in speed, but in rhythm.
Because in a world of machines, the best camouflage is being human.

Stay natural. Stay unpredictable.
And remember: in the world of fraud, scrolling is body language.