What Is Funding Cap Saturation on Polymarket Perps? The ±4% Per Hour Cap

The ±4% hourly cap looks like trivia until your position spends a day pinned to it. Saturation — funding at the ceiling — is the market shouting its maximum-crowding state, and at leverage it’s the difference between a cost line and a liquidation vector. Here’s what saturation means, what it predicts, and the math at each leverage that decides hold-vs-cut.

What does the 4% funding cap mean on Polymarket Perps?

The funding formula is clamped at ±4% per hour — the maximum the rate can charge per settlement regardless of how extreme the premium gets (the full formula structure is in funding mechanics). Saturation means the clamp is binding: the book’s premium is so one-sided that the formula wants to charge more than the cap allows. Longs pay 4%/hour (positive saturation) or shorts pay 4%/hour (negative). At settlement, that’s the transfer — peer-to-peer, no protocol cut.

The position math at saturation

Per hour, as a % of margin:

Read that table honestly: a 20x position paying saturated funding is mathematically dead in about a day even with zero price movement — the drag alone consumes the margin. A 5x position has maybe two days of breathing room at full saturation. This is why the liquidation interaction matters: funding hollows the buffer that price risk then consumes. The decision calculus: if your thesis needs the position held through expected saturation, the thesis must profit more than the table’s bottom line — or you’re renting conviction at 20%/hour (the projection discipline is in the forecaster guide).

What saturation actually signals

Crowding at maximum. Everyone who wants the position has it — marginal buyers are exhausted. Historically, maximum crowding is where reversals live: the crowded side has no new money to push price further, and the thin side’s carry (earning the 4%) is being paid by holders with the weakest hands. This doesn’t predict a flip on a clock — but it reprices the risk: continuing to pay max carry for a crowded position is a statement that you expect the crowd to be right and the event to deliver fast. Both assumptions deserve scrutiny — see the two funding reads.

How long does it last? Typically the duration of its cause: a news cycle, an event week, a squeeze. Funding history shows saturation episodes clustering around events and unwinding after — the event-proximity pattern. It can re-saturate on the opposite sign when the crowd rotates — which is the position-flip moment traders on the thin side wait for.

The hold-vs-cut playbook at saturation

1. Recompute your thesis profit versus the table. If expected profit < expected carry to resolution, cut now — the exit spread is cheaper than the carry (see the cost stack). 2. Cut size, keep exposure. Halving the position halves the carry burn while keeping half the thesis — the sizing caps logic under duress. 3. Flip sides if the crowd’s conviction breaks. Going to the thin side at saturation means earning the cap — a real edge when your read says the crowding is exhausted (see shorting mechanics). 4. If holding: pre-compute the liquidation timeline. Drag plus adverse move against a hollowing buffer — know your hours, not just your levels (the buffer math).

FAQ

What is the maximum funding rate on Polymarket Perps? ±4% per hour — the formula’s clamp. At saturation, a 20x position pays ~80% of margin per hour in funding alone; the position math by leverage is in the table above.

Why did my perps position lose money overnight without the price moving? Saturated funding: hours at the 4% cap consume margin directly. At 5x that’s 20%/hour of margin — check your funding ledger and the saturation playbook.

What does it mean when funding hits the cap? Maximum crowding: the premium wanted to charge more than the clamp allows. Historically a reversal-risk signal, not a prediction — the hold-vs-cut decision framework is above.

Can I earn the cap instead of paying it? Yes — hold the thin side: shorts at positive saturation and longs at negative saturation receive 4%/hour. Carry-as-edge at saturation is real but pairs with reversal risk — see the funding reads.

How long does funding saturation last? As long as its cause — typically a news cycle or event week, visible in funding history clustering. Re-saturation on the opposite sign marks crowd rotations: see the event-proximity pattern.

Educational content, not financial advice. Not affiliated with Polymarket. Last updated October 2026.