Polymarket API Tutorial — Build a Python Trading Bot from Zero
Polymarket runs the same order book architecture as Coinbase and Binance.
You can read prices, place orders, and build automated trading bots through
their API. Almost nobody has made a good tutorial for it. Until now.
I walk through the entire setup — from installing py-clob-client to placing
your first programmatic trade — then show how we turned this into 5 live
bots that trade across 9 sports.
In this episode:
What a CLOB is and why Polymarket works like a crypto exchange
Setting up API credentials (key, secret, passphrase, private key)
The token ID system — why YES and NO are separate and how to find them
Reading the order book: bids, asks, spread, depth at each level
Placing limit orders and aggressive fills (market-like execution)
Managing and canceling open orders
The minimal trading bot loop: fetch price → compare to model → execute
WebSocket streaming for sub-second price updates
The silent WebSocket disconnect problem and how to fix it
Why the 2% fee means your minimum edge is 3-4 cents, not zero
Stale orderbooks after score changes — the 45-second rule
Token ID confusion: the most expensive mistake new developers make
From API connection to a real edge: what else you need besides code
Every bot we run at ZenHodl uses this exact API. The connection is the easy
part — the model and the discipline are what make it profitable.
Full blog post with all code snippets:
https://zenhodl.net/blog/polymarket-a...
Official Polymarket API docs:
https://docs.polymarket.com/
py-clob-client on GitHub:
https://github.com/Polymarket/py-clob...
Build the complete bot from scratch (6-module course):
https://zenhodl.net/course
Live bot results (every trade on-chain):
https://zenhodl.net/results
API docs for our prediction layer:
https://zenhodl.net/docs
Community + free signals:
/ discord
#polymarket #python #tradingbot #api #tutorial #predictionmarket #clob
#crypto #sportsbetting #defi #websocket
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