Why $7K/Day Arbitrage Bots Disappeared After the 2021 Polygon MEV Era

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The idea that arbitrage bots used to make $6,800–$7,000 per day on Polygon is real.

It is also the reason most people misunderstand what changed.

Because those profits did not disappear due to lack of opportunity.

They disappeared because the system that produced them was dismantled.

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1. What the 2021 System Actually Looked Like

During the early Polygon MEV expansion period:

• arbitrage bots operated in fragmented mempool conditions
• price inefficiencies persisted across DEXs
• execution competition was minimal
• blockspace was not fully optimized for MEV extraction

This allowed consistent extraction patterns:

• ~$45.64M+ confirmed MEV baseline on Polygon
• ~$22.5M extracted in a single Aug–Dec 2021 window
• ~$213M+ lifetime lower-bound MEV estimates

And within that environment:

individual bots consistently produced $6,800–$7,000 daily profits

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2. The Key Misunderstanding

People assume:

“those bots were just better traders”

They were not.

They were operating in a system with structural delay:

• slow arbitrage propagation
• weak mempool coordination
• limited MEV-aware competition

The profit was not skill-only.

It was latency-enabled extraction.

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3. What Changed (The Collapse of the Profit Layer)

Three structural shifts removed the conditions for $7K/day bots:

1. MEV Competition Saturation

Once Flashbots-style coordination spread:

• multiple bots detected the same opportunity instantly
• arbitrage became competitive bidding, not discovery

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2. Mempool Became an Auction Layer

Instead of passive transaction flow:

• bots simulate all outcomes in real time
• gas bidding determines inclusion
• priority ordering decides profit capture

This removed predictable entry points.

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3. Execution Infrastructure Centralized

Modern MEV systems introduced:

• private relays
• builder networks
• optimized bundle execution

So arbitrage is no longer public.

It is pre-processed before visibility.

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4. Why the $7K/Day Regime Cannot Reappear

Those returns depended on:

• delayed price correction
• fragmented liquidity response
• non-competitive blockspace

All three conditions are gone.

Now the system behaves as:

a continuous MEV auction for execution priority

Not a repeatable arbitrage loop.

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5. The Transition From Arbitrage to MEV Extraction

In 2021:

• arbitrage = price inefficiency capture
• profit = gap between markets

Today:

• arbitrage = execution competition
• profit = ordering advantage in block inclusion

This shift is critical:

value moved from detection → to execution priority

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6. Why Early Bots Were So Dominant

Historical data shows:

• one bot turned 14 ETH into 218.5 ETH (~$825K) in 4 months
• top bots controlled ~30% of Polygon transaction flow

This dominance was possible because:

• competition density was low
• mempool visibility was fragmented
• MEV awareness was minimal

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7. The Flashbots Effect

Flashbots research and MEV infrastructure introduced:

• transparent MEV discovery
• standardized extraction pipelines
• competitive bundle systems

This caused:

arbitrage opportunities to be consumed before they became visible

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8. What Replaced the $7K/Day Bots

They did not vanish.

They evolved into:

• MEV searchers
• bundle builders
• latency-optimized execution systems

But the predictable daily profit regime disappeared.

Now returns are:

• highly variable
• competition-dependent
• infrastructure-driven

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9. Final Insight

The disappearance of $7K/day arbitrage bots is not a decline in opportunity.

It is a structural upgrade of the system.

From:

inefficiency harvesting

to

execution-layer competition

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Closing Reality

If you are looking for the same pattern that produced 2021 profits:

You are looking at a system that no longer exists.

Modern MEV does not reward observation.

It rewards inclusion speed in a competitive execution auction.