Engineering & strategy notes

Things we've learned shipping prediction-market bots.

Technical posts by the engineers writing the production code.

23 posts New every 2-3 weeks
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INTRO

What is Polymarket? A plain-English introduction

How prediction markets work, who the real traders are, what a bot actually does, and whether any of this can generate consistent returns.

Camille M. 11 min · May 25
COPY TRADING

Polymarket Copy Trading: a complete 2026 guide

Mirror profitable wallets - what works, what doesn't, and what survivorship bias actually costs you over a 12-month window.

Camille M. 9 min · May 4
ARBITRAGE

Polymarket vs Kalshi arbitrage: how the cross-platform trade works

The 2¢ trade gets harder on Polymarket alone. The cross-platform trade adds basis risk - and a much bigger envelope per fill.

Léo M. 11 min · Apr 28
INFRASTRUCTURE

Polymarket API rate limits and how to stay under them

100 req/min is generous until you're watching 50 markets. The priority-queue choreography that gets you through 200% load without throttle.

Yael S. 8 min · Apr 22
REVIEW

Do Polymarket bots actually make money? An honest look.

We pulled the running PnL on 12 production bots we've shipped over the last 18 months. The distribution is wider than the marketing suggests.

Roger L. 14 min · Apr 14
KALSHI

Kalshi Trade API: a developer's first 200 lines

CFTC-regulated, REST-y, less drama than Polymarket's CLOB. The minimal viable bot, with the boring parts written for you.

Daniel T. 10 min · Apr 6
COPY TRADING

How to track Polymarket whales: building your own wallet monitor

A 40-line Polygon RPC indexer that turns into a whale-tracker over a weekend. Plus the production-grade upgrades you'll wish you had on day 30.

Camille M. 13 min · Mar 28
INFRASTRUCTURE

Running multiple Polymarket wallets with proxy infrastructure

Multi-wallet routing for reward-market eligibility, without violating ToS or accidentally building a sybil cluster.

Yael S. 15 min · Mar 19
GUIDE

Can I use a Polymarket bot in the US? (2026 compliance guide)

The honest answer, the ToS reading, the QCEX beta window, and why Kalshi is probably the right venue if you're US-resident.

Daniel T. 7 min · Mar 8
ARBITRAGE

Sum-to-one arbitrage: when YES + NO < $1.00

The simplest prediction-market arb, walked through with a worked example, fees breakdown, and the leg-failure scenario nobody warns you about.

Léo M. 6 min · Feb 22

Showing 9 of 23 posts · Page 1 / 3

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One technical post a month. No marketing.

Written by the engineers who write the production code. Best-suited for developers and operators who run real money through prediction markets.