Venue

Week 3 — CLOB V2 rewrite

28 April 2026AmsterdamJordi Lluis

Polymarket moved production trading to CLOB V2 on this date. That comes from their migration notes, not from a line in my bot log.

What the venue change documented
ContractsNew exchange contracts and a rewritten CLOB backend.
CollateralpUSD replaced USDC.e.
OrdersSigned-order fields changed. Open orders were wiped.
FeesMatch-time fee handling changed.

Four days later I changed the bot myself. Two dates on a calendar are not an A/B test. I do not get to say the patch killed the edge from that overlap.

28 April is a venue cutover. 2 May is my code. Later losses do not pick a winner between them.

CLOB V2 changelog · Migration guide · Evidence map

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