Updating a Polymarket Bot for the 60s TWAP Change (5-Minute Crypto Markets)

On August 14, 2026, Polymarket moved all 5-minute crypto Up/Down markets from a 30-second Chainlink TWAP to a 60-second Chainlink TWAP.

If your bot was built around the 30s series, several layers are now wrong at the same time: the live feed, the open reference, the signal features, the scratch logic, and the resolution labels.

This post is a practical checklist for updating a directional bot (especially BTC 5m) to the new settlement target.

1. What Broke

Layer	Old assumption	New reality
Primary price series	30s Chainlink TWAP	60s Chainlink TWAP
Slot-open reference	Pinned from 30s feed	Must pin from 60s feed
Signal features	Tuned to faster noise	Need retuning on smoother path
Scratch / conviction	Thresholds for 30s regime	Optimal cut points shift
Resolution scoring	Compare vs 30s value	Compare vs 60s value
Paper / backtest labels	30s outcomes	Must rebuild under 60s rules

The strategy idea can stay the same (“forecast the official TWAP path”). The implementation target changed.

2. Feed Layer Updates

Subscribe to the correct window

For 5-minute markets the primary series is now the 60-second TWAP.

Via Polymarket RTDS this means using the sixty-second topic/window, for example:

• Topic style: crypto_prices_twap_sixty
• Or SDK windowSeconds: 60
• Filter form remains exact: {"symbol":"btc/usd"}

Keep the 30s feed only if you still need it for research or legacy comparison. Do not use it for live 5m settlement logic.

Staleness rules

A smoother series can make “quiet” periods look healthy even when the feed is lagging. Keep an explicit max age on observationsTimestamp (or equivalent). If the TWAP is stale, skip the slot.

Precision

Continue treating TWAP values as exact decimal strings / bigints. Do not route settlement-sensitive math through ordinary floating point.

3. Slot Lifecycle Changes

Pin open reference from the same series

At slot open:

twap_ref = current_60s_TWAP

Both the price-to-beat and the final settlement must come from the matching window. Mixing 30s open with 60s close creates silent label error.

Continuous re-score on the new path

Every update cycle should recompute:

features  ← path of 60s TWAP vs twap_ref + time remaining + aux signals
P(up)     ← model(features)

If your model was calibrated on 30s trajectories, expect the raw probabilities to be mis-scaled until you re-fit.

4. Signal and Feature Retuning

The 60s TWAP is slower and less noisy. Practical consequences:

• Short-horizon momentum features shrink in magnitude
• Spike / wick detectors fire less often
• Mean-reversion signals behave differently near the end of the slot
• Time-in-slot calibration needs new breakpoints

Minimum viable approach:

1. Log 60s TWAP paths for several hundred live slots
2. Rebuild labels using official resolution (gamma + 60s TWAP)
3. Re-estimate feature weights or re-train the private model
4. Only then restore previous size

Do not assume old thresholds transfer 1:1.

5. Scratch Logic (Often Forgotten)

Many bots kept a healthy held-side win rate because they scratched weak tickets near breakeven.

Under a smoother 60s series:

• Some previous “decay” signals are now just normal noise reduction
• Other real regime changes appear later

Re-optimize:

• Minimum hold time before scratch is allowed
• Probability drop required to flatten
• Max adverse excursion before forced exit

A scratch layer tuned on 30s data can destroy edge on 60s data even if the directional idea is still valid.

6. Resolution and Accounting Path

Update the scoring order for post-cutover slots:

1. Gamma outcomePrices when available (authoritative)
2. 60s Chainlink TWAP vs open reference
3. Explicitly drop any remaining 30s or single-snapshot close path for new markets

Log for every resolved slot:

• Which TWAP window was used
• Open reference value + timestamp
• Final TWAP value + timestamp
• Resolution source (gamma / rtds_twap_60 / etc.)

This makes post-mortems possible when results look off.

7. Suggested Migration Order

1. Config flag — Make TWAP window a parameter (30 → 60)
2. Feed switch — Point live 5m path at 60s RTDS/Chainlink
3. Open pin + resolution — Force both to the same 60s series
4. Shadow mode — Run old 30s decisions vs new 60s decisions side by side without size
5. Feature / model refresh — Recalibrate on 60s paths
6. Scratch retune — Adjust culling thresholds
7. Micro size — Re-enable live risk only after the above stabilize

8. What You Can Keep

• Specialization on BTC 5m (or a small set of crypto 5m markets)
• Mid-band entry philosophy (45–55¢)
• Hybrid hold-to-resolution + scratch design
• Hard per-slot and daily risk limits
• Idempotent CLOB execution and reconciliation

The architecture can stay. The target variable cannot.

9. Failure Modes to Watch After the Switch

• Trading a 30s model against 60s settlement (silent edge decay)
• Pinning open price from the wrong feed
• Over-scratching because thresholds are still too sensitive
• Under-scratching because the series looks “stable” while the thesis is already dead
• Paper PnL that still uses pre-Aug-14 labels
• Stale TWAP accepted as fresh because update cadence looks fine

Bottom Line

The 60s TWAP update is a settlement-target change, not a cosmetic feed rename.

For a bot developer the required work is concrete:

1. Consume the 60s series
2. Pin open and resolve against it
3. Recalibrate the signal
4. Retune the scratch layer
5. Prove the new path in shadow mode before scaling size

Systems that complete that loop stay aligned with how Polymarket actually pays out. Systems that only flip a topic name usually do not.

Not financial advice. Verify live market rules and feed IDs for the exact contracts you trade.

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

#Polymarket #TWAP #TradingBot #AlgoTrading #Chainlink #BTC #PredictionMarkets #SoftwareEngineering

Polymarket #TWAP #TradingBot #AlgoTrading #Chainlink #BTC #PredictionMarkets #SoftwareEngineering