Polymarket US odds API.
One US source, one clear ID.

RequestPython 3 · requests

import os
from datetime import datetime, timezone
import requests

key = os.environ["THERUNDOWN_API_KEY"]
api = "https://therundown.io/api/v2"
headers = {"X-TheRundown-Key": key}

# Next game date across the NFL (2), NBA (4), and NHL (6)
dates = requests.get(
    f"{api}/sports/dates",
    params={
        "sport_ids": "2,4,6",
        "format": "epoch",
        "exclude_canceled": "true",
    },
    headers=headers,
    timeout=30,
).json()

now = datetime.now(timezone.utc).timestamp()
upcoming = [
    (sport_id, stamp)
    for sport_id, body in dates.items()
    for stamp in body.get("dates") or []
    if stamp > now
]
sport_id, stamp = min(upcoming, key=lambda row: row[1], default=("2", now))
date = datetime.fromtimestamp(stamp, timezone.utc).date().isoformat()

# Polymarket US (31), global Polymarket (26), and DraftKings (19)
odds = requests.get(
    f"{api}/sports/{sport_id}/events/{date}",
    params={"market_ids": "1,2,3", "affiliate_ids": "31,26,19", "main_line": "true"},
    headers=headers,
    timeout=30,
)
print(odds.text)