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Polymarket TWAP Settlement Explained: What Every Bot Must Change After August 7, 2026

On August 7, 2026, Polymarket permanently changed how short-duration crypto Up/Down markets resolve.

This is the single most important technical update for bot developers in 2026. If your system still treats the closing price as a single oracle snapshot, your fair-value logic, signal generation, and resolution handling are now incorrect.

This article breaks down exactly what changed, why it matters, and what you need to update in code.

What Changed

Before August 7, crypto Up/Down markets resolved on a single price snapshot at expiry.

After August 7, they resolve on a Chainlink-powered Time-Weighted Average Price (TWAP):

Market Type New Resolution Method
5-minute crypto markets 30-second TWAP
15-minute crypto markets 60-second TWAP
4-hour crypto markets 60-second TWAP

Affected assets include BTC, ETH, SOL, XRP, HYPE, BNB, DOGE, and other crypto pairs that use the Up/Down format.

Both the opening price (the level to beat) and the settlement price now come from the TWAP feed.

Why Polymarket Made This Change

Single-price snapshots are easy to manipulate in the final seconds of a short window. A large order can wick the price just long enough to flip the outcome, then disappear.

A TWAP forces any attempt at manipulation to be sustained across the entire averaging window (30 or 60 seconds). That is significantly more expensive and risky.

The change improves market integrity, but it also breaks a large class of existing bots that were built around last-tick behavior.

How TWAP Affects Bot Architecture

You need to update three distinct layers:

1. Fair-Value / Signal Generation

Many bots previously compared:

  • Slot open price (snapshot)
  • Current or final tick price

That comparison is no longer valid for resolution. Your model must now estimate where the TWAP will land, not where the last tick will print.

Practical approaches:

  • Stream the live 30s/60s TWAP and treat it as the primary price series
  • Maintain a rolling window of recent ticks and compute your own approximation only as a fallback
  • Prefer the official Chainlink/RTDS value over any self-calculated average

2. Entry Timing Logic

Strategies that relied on final-second momentum or expiry spikes lose effectiveness. The last few seconds of the chart no longer have outsized influence on the outcome.

Bots that entered very late purely to catch a wick will see degraded performance. Earlier, more path-aware entries become relatively more valuable.

3. Resolution & PnL Attribution

This is the most common source of silent bugs after the cutover.

Your score_pending / settlement logic must stop using:

  • closePrice
  • Last trade price
  • Single oracle snapshot at slot_end

And start using:

  1. Official gamma outcomePrices (still authoritative when available)
  2. RTDS / Chainlink TWAP value at the relevant window
  3. Only then any fallback snapshot (and only for pre-cutover slots)

If you train models or run paper trading, the labels must also switch to TWAP-based outcomes. Continuing to label with old snapshot logic creates systematic training error.

Official Data Sources

Polymarket provides two ways to consume the correct values:

A. Chainlink Data Streams (Direct)

  • Use existing standard or sponsored Chainlink credentials
  • Access signed 30s and 60s TWAP reports
  • Best when you need the original cryptographic report

B. Polymarket RTDS (Recommended for most bots)

  • WebSocket: wss://ws-live-data.polymarket.com
  • Topic delivers Chainlink-computed TWAP updates
  • No separate Chainlink credentials required
  • Native support in the current TypeScript and Python SDKs

Example conceptual subscription (TypeScript):

{
  topic: "prices.crypto.chainlink.twap",
  windowSeconds: 60,          // or 30
  symbols: ["btc/usd"]
}
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Always treat the returned value as an exact decimal string. Do not convert it to a floating-point number if you care about precision.

Implementation Checklist

  • [ ] Replace all snapshot-based resolution paths for post-Aug-7 slots
  • [ ] Stream RTDS (or Chainlink) TWAP as the primary price feed
  • [ ] Add staleness checks on the TWAP value before using it for scoring
  • [ ] Update paper-trading and backtest label generation
  • [ ] Re-evaluate any strategy that depended on last-second price action
  • [ ] Log both the TWAP value and its observation timestamp for every resolved market
  • [ ] Keep gamma outcomePrices as the final authoritative fallback

Common Failure Modes After the Cutover

  1. Silent label drift — Bot continues to record wins/losses using the old close price while Polymarket settles on TWAP.
  2. Stale fair value — Signal still updates on REST polls while the book and TWAP move in real time.
  3. Over-reliance on final ticks — Strategy waits for a late move that no longer affects the outcome as strongly.
  4. Incorrect open price handling — Some systems previously reused the prior settlement price as the next open; this becomes even more dangerous under TWAP.

Bottom Line

The TWAP change is not a minor oracle upgrade. It redefines the settlement random variable that every short-duration crypto strategy is trying to predict or arbitrage.

Bots that adapt cleanly will operate on the same target Polymarket actually uses.

Bots that ignore it will slowly accumulate resolution mismatches, incorrect paper results, and degraded live performance.

The required work is straightforward but non-negotiable:

  • Consume the official TWAP
  • Align signals to it
  • Resolve against it

Everything else in your stack should be built on top of that foundation.

If you have more questions, please feel free to contact me at any time: https://t.me/abrownfox001

My Polymarket Activity: https://polymarket.com/@abrownfox001?tab=activity

GitHub logo abrownfoxOO1 / Up-Down-Trading-Bot

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abrownfox001 — BTC 5-Minute Directional Engine (Polymarket)

Live automated trading on Polymarket BTC Up/Down 5-minute markets: a calibrated short-horizon directional read anchored to the latest Chainlink TWAP, fair ~50¢ entries, and breakeven scratch exits so only high-conviction legs reach resolution.

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Profile: abrownfox001 · pseudonym Wretched-Notice · X: appledog_xyz
Wallet (proxy): 0x12b712029efeee7efc4066e98e4e1b6beb8b1b0b · active since Jan 12, 2026

Verified account

Screen recording of the live Polymarket session — proof this profile and wallet are mine:

Polymarket account walkthrough for @abrownfox001

Logged-in walkthrough of @abrownfox001 (GIF, silent).

Run the bot

WinnerLockBot.exe — standalone Windows build. No Python install, no manual config files.
Setup First launch prompts for required Polymarket credentials and settings
Storage Your inputs are saved locally on your machine — no .env file needed
Activation After setup completes, the bot starts automatically
License 2-day trial from first activation

Getting started

  1. Download and run WinnerLockBot.exe.
  2. On first launch, follow the on-screen prompts to…
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#Polymarket #TWAP #Chainlink #TradingBot #PredictionMarkets #CryptoTrading #AlgoTrading
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