🎯 Polymarket 初心者入門｜予測市場・CLOB・公式Python SDKを無料で触ってみる

# Python 3.9以上が必要
python --version

# 作業用フォルダを作って仮想環境
mkdir poly_demo && cd poly_demo
python -m venv .venv

# Windows
.venv\Scripts\activate
# Mac/Linux
source .venv/bin/activate

# 公式SDKと必要ライブラリをインストール
pip install py-clob-client pandas requests

# 00_ping.py
from py_clob_client.client import ClobClient

client = ClobClient("https://clob.polymarket.com")
print("ok:", client.get_ok())
print("time:", client.get_server_time())

ok: OK
time: 1775886703

# 01_list_markets.py
from py_clob_client.client import ClobClient

client = ClobClient("https://clob.polymarket.com")
resp = client.get_sampling_markets(next_cursor="")
data = resp.get("data", [])

candidates = []
for m in data:
    if m.get("closed") or not m.get("active"):
        continue
    yes = next((t for t in m.get("tokens", []) if t.get("outcome") == "Yes"), None)
    if not yes or yes.get("price") is None:
        continue
    p = yes["price"]
    if 0.05 < p < 0.95:
        candidates.append((p, m))

# 中間に近い順（=市場が悩んでる順）
candidates.sort(key=lambda x: abs(x[0] - 0.5))

for p, m in candidates[:5]:
    print(f"YES={p}  Q: {m.get('question', '')[:70]}")

YES=0.5    Q: Will Scott Wiener receive the most votes in the CA-11 primary?
YES=0.495  Q: Anthropic IPO before 2027?
YES=0.505  Q: Will Bert Mizusawa be the Republican nominee for Senate in Virginia?
YES=0.495  Q: Will Chainlink dip to $6 by December 31, 2026?
YES=0.505  Q: Will the Democrats win the Ohio governor race in 2026?

# 02_orderbook.py
from py_clob_client.client import ClobClient

client = ClobClient("https://clob.polymarket.com")

# "Anthropic IPO before 2027?" のYESトークンID
YES_TOKEN = "31650083965282390269113502048883725495895331661148956202621012482964650485070"

book = client.get_order_book(YES_TOKEN)

print("[ BIDS 買い注文 ]")
for b in sorted(book.bids, key=lambda x: -float(x.price))[:5]:
    print(f"  price={b.price}  size={b.size}")

print("\n[ ASKS 売り注文 ]")
for a in sorted(book.asks, key=lambda x: float(x.price))[:5]:
    print(f"  price={a.price}  size={a.size}")

print(f"\nmidpoint: {client.get_midpoint(YES_TOKEN)}")
print(f"best bid: {client.get_price(YES_TOKEN, 'BUY')}")
print(f"best ask: {client.get_price(YES_TOKEN, 'SELL')}")
print(f"spread  : {client.get_spread(YES_TOKEN)}")

[ BIDS 買い注文 ]
  price=0.48  size=50
  price=0.47  size=351
  price=0.46  size=66

[ ASKS 売り注文 ]
  price=0.51  size=43
  price=0.52  size=245
  price=0.53  size=266

midpoint: {'mid': '0.495'}
best bid: {'price': '0.48'}
best ask: {'price': '0.51'}
spread  : {'spread': '0.03'}

# 03_price_history.py
import csv, time, requests

YES_TOKEN = "31650083965282390269113502048883725495895331661148956202621012482964650485070"

url = "https://clob.polymarket.com/prices-history"
params = {
    "market": YES_TOKEN,
    "interval": "1d",  # 1h, 1d, 1w, max
    "fidelity": 60,    # 分単位
}

r = requests.get(url, params=params, timeout=15)
history = r.json().get("history", [])

with open("price_history.csv", "w", newline="", encoding="utf-8") as f:
    w = csv.writer(f)
    w.writerow(["timestamp_unix", "datetime_utc", "price"])
    for pt in history:
        dt = time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(pt["t"]))
        w.writerow([pt["t"], dt, pt["p"]])

prices = [p["p"] for p in history]
print(f"points={len(history)} min={min(prices)} max={max(prices)} last={prices[-1]}")

points=9 min=0.495 max=0.55 last=0.495