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Polymarket bot fees (July 2026)
Fee tables move. As of July 1, 2026, Polymarket US taker Θ is 0.06 in the published US schedule. If your spreadsheet still says last year’s number, throw it out.
US fee shape
Fee ≈ Θ · C · p · (1 − p)
Where C is contracts, p is price in [0, 1], and Θ is the schedule coefficient. Cost peaks near mid-price — the place high-frequency taker strategies love to live.
| Lever | Why it matters for bots |
|---|---|
| Θ (taker) | Schedule coefficient — re-fetch; do not hardcode forever |
| p near 0.5 | p·(1−p) peaks; “coin flip” markets are expensive to take |
| Maker vs taker | Limit designs matter more when taker Θ rises |
| Path | US numbers are not International numbers |
Worked intuition (not a promise)
At p = 0.50, p·(1−p) = 0.25. At Θ = 0.06, fee per contract ≈ 0.015 (1.5¢) before other costs. At p = 0.90, p·(1−p) = 0.09 — fee drag is lower, but your edge story is different. The point is not the exact penny: mid-price taker loops feel schedule changes first.
What changed for bots after July 1, 2026
- Taker strategies feel it first. Edge that was thin at the old Θ can go negative after a schedule bump.
- Maker / limit designs matter more when taker Θ rises — see order book basics.
- Always date your model. “Polymarket fees” without a path and a date is not a model.
Operator sequence
- Confirm you are on the US vs International path you think you are.
- Re-fetch the live fee schedule before you size — do not trust this page forever.
- Put fee math inside the decision loop, not in a forgotten spreadsheet.
- Paper-trade with fees on; then go live at tiny size. See risk controls.
Join the Bot for Polymarket waitlist if you want a hosted builder with paper mode and risk limits.
Part of the Polymarket trading bots handbook.
Market Mechanics Desk · Numbers as of July 1, 2026 US schedule · Updated 2026-07-08