What Changes With Polymarket V2 on April 28, 2026
A one-hour outage, a new collateral token, and some real migration work for API traders. Here’s what retail users, builders, and market makers actually need to know.
Cutover
2026-04-28
Downtime
~1 hour
Collateral
USDC.e → pUSD
Open orders
Canceled
Quick Summary
The key takeaway from this page
Cutover snapshot
The outage window, correction history, and the fastest practical summary
Date correction history
This cutover was originally announced for April 22, 2026, then silently revised by Polymarket to April 28, 2026 between April 17 and April 19 without a public announcement. On April 22, a live-industry signal briefly suggested the cutover was reverting to the original April 22 date; a primary-source re-fetch at 17:29 UTC that same day re-confirmed Polymarket’s own docs still state April 28, 2026 at ~11:00 UTC. The confirmed date is April 28.
This page maintains the full correction audit trail in the underlying data file. Primary source: docs.polymarket.com/v2-migration.
30-second answer
If you’re a retail user:
- Polymarket will be offline for ~1 hour starting ~11:00 UTC on 2026-04-28 (~07:00 ET).
- Your funds and positions are safe. No action is required beyond a one-time “approve” click when you next log in.
- Your USDC.e balance converts 1:1 into pUSD.
If you use the API or run a bot:
- Migrate to the V2 SDK before 2026-04-28 or your orders will stop working.
- All open limit orders will be wiped at cutover.
Auto-redemption is now live
Auto-redemption of winning positions is now live on Polymarket. You no longer need to manually click through each resolved market to collect—your winning position balance updates automatically after resolution. Manual redemption still works for any pre-existing positions that predate the rollout.
The timeline
The dated milestones around the migration and what each one signals
Polymarket announces 'full exchange upgrade' including pUSD and CTF Exchange V2
Initial cutover date reported as April 22 ~11:00 UTC, ~1 hour downtime
Cutover date CORRECTED: April 28 ~11:00 UTC (was April 22 in earlier docs, silently revised by Polymarket between Apr 17 and Apr 19)
AM commit briefly reverted page to April 22 based on live-industry signal without re-fetching primary source. Afternoon re-fetch of docs.polymarket.com/{changelog,v2-migration} at 17:28–17:29 UTC re-confirmed April 28 ~11:00 UTC unambiguously; page corrected back to April 28.
V2 cutover. V1 permanently decommissioned. Open orders wiped.
What’s actually changing
Mechanical changes worth tracking versus background facts that stay the same
Three user types — what you actually do
The migration work is different for retail frontends, API traders, and builders
Retail user via the Polymarket website or app
Estimated effort: 30 seconds
Before cutover:
None required
At cutover:
One-time approve transaction for pUSD wrap on next login
API trader or bot operator
Before cutover:
- Install @polymarket/clob-client-v2 (npm) or py-clob-client-v2 (pip)
- Remove legacy clob-client / py-clob-client packages
- Update SDK constructor from positional args to options object; rename chainId to chain
- Remove feeRateBps, nonce, taker from order creation code
- If signing orders manually, update verifyingContract and Order fields; bump EIP-712 domain version from '1' to '2'
- Test against clob-v2.polymarket.com before the cutover date
At cutover:
Open orders will be wiped. SDK hot-swap auto-refreshes to V2 endpoints.
Builder / integrator (attribution-based)
Before cutover:
- Copy builderCode from Polymarket Settings, Builder tab
- Attach builderCode to orders going forward
- Remove builder-signing-sdk dependency (no longer needed; attribution is native)
At cutover:
None beyond the SDK migration above
The pre-cutover week in context
The migration now sits inside a broader regulatory week, not a same-day catalyst pileup
The cutover now sits inside a regulatory week, not a same-day catalyst stack. These are the dated items around it:
Kevin Warsh Senate Banking confirmation hearing (Fed Chair nominee)
Polymarket/Kalshi pricing of Fed-chair confirmation + rate path referenced by press. Separate week from V2 cutover.
Read morePolymarket V2 downtime begins (~11:00 UTC per dev docs)
~1-hour outage. Kalshi and ForecastEx unaffected. Note: Polymarket help-center FAQ states a 7:00 AM UTC pause / 8:00 AM UTC resume window that contradicts the dev-doc 11:00 UTC timing on the same help-center page's own Key Details section. Treat dev-doc 11:00 UTC as authoritative; monitor status.polymarket.com on the day for the actual start.
NCSL Town Hall: Prediction Markets
State legislators' coordinated policy discussion one day before the federal comment window closes.
Read moreCFTC ANPRM public comment period closes (RIN 3038-AF65)
Federal event-contract rulemaking input phase closes.
Read moreIf you rely on Polymarket pricing for news reactions, the site will be unavailable for ~1 hour mid-morning on 2026-04-28. Kalshi and Interactive Brokers ForecastEx are not affected.
Caution — what this page is not
Important boundary lines so the migration story does not get confused with token speculation or scam bait
- This is not a POLY airdrop guide. Polymarket has not announced a POLY token launch. The V2 upgrade is separate from any governance-token plans.
- This is not investment advice on pUSD. pUSD is a platform collateral token, not a tradable speculation asset. It is not listed on exchanges.
- Scam warning: Anyone asking you to “airdrop your wallet for POLY” is likely a scam. Never sign transactions from third-party sites claiming to distribute POLY tokens.
Source transparency
Why this page uses primary-source migration docs rather than recycled crypto-blog summaries
Source transparency: All mechanical facts on this page come from Polymarket’s own changelog and V2 migration documentation. Secondary journalism and crypto-blog syndications are excluded from citation by editorial policy. Primary-source links are provided inline where available; any pending primary-source verification is noted in the data layer and will be completed by our verification process. Last verified: 2026-04-27T22:08:00Z.
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