Answer · Bettors · Arbitrage

Arbitrage calculator using Pinnacle odds

Updated 9 November 2026 · PinnFeed · 2 min read

Answer: an arbitrage exists when the best prices for every outcome of a market, taken across books, have implied probabilities that sum to less than 1: 1/p1 + 1/p2 (+ 1/p3) < 1. Stake each outcome in proportion to 1/price to lock the same return. PinnFeed supplies Pinnacle's side of the comparison in real time (Builder) or via REST; the other book's prices come from your own source, since PinnFeed is Pinnacle-only.

Formula and stake split#

def arb(prices: list[float], bankroll: float = 100):
    inv = [1 / p for p in prices]
    total = sum(inv)
    if total >= 1:
        return None                         # no arbitrage
    stakes = [bankroll * i / total for i in inv]
    return {"margin": 1 - total, "stakes": [round(s, 2) for s in stakes],
            "return": round(bankroll / total, 2)}

print(arb([2.12, 2.02]))   # Pinnacle over 2.12, other book under 2.02 -> small arb

With 2.12 and 2.02 the implied sum is 0.9668, so a 100 bankroll returns about 103.44 whichever side wins, before fees and if both bets stand.

Alert loop (Pinnacle side from PinnFeed)#

import os, time, requests
KEY = os.environ["PINNFEED_KEY"]  # ps_live_...

def other_book_prices(event):        # plug in your own source here
    return {}

while True:
    r = requests.get("https://pinnfeed.io/v1/odds",
        params={"sport": "tennis", "market": "moneyline", "main": "true", "limit": 100},
        headers={"x-api-key": KEY}, timeout=10)
    for e in r.json()["events"]:
        for m in e["markets"]:
            if (m["maxStake"] or 0) < 100:
                continue
            pin = {o["name"]: o["decimal"] for o in m["outcomes"]}
            other = other_book_prices(e)          # {"home": 1.9, "away": 2.2}
            if set(pin) == set(other) and pin:
                best = [max(pin[k], other[k]) for k in pin]
                res = arb(best)
                if res:
                    print(e["home"], "v", e["away"], res)
    time.sleep(5)                                  # Hobby allows 2 req/s

Risks before you bet#

Prices move between the two bets; one leg can be missed.
Books may void palpable errors or limit arbitrage accounts.
Rules differ (retirements in tennis, overtime, dead heats); a "sure" arb can lose if settlement differs.
Compare value betting, which often scales better: arbitrage vs value betting.

Plans#

Free is 30 s delayed, too slow for arbitrage except testing. Hobby (€29/mo) is real-time REST; Builder (€99/mo) pushes Pinnacle changes over the WebSocket. 3-day trial; a card is required and it is charged after day 3 unless you cancel.

Educational content for adults (18+). Arbitrage carries execution and settlement risk; nothing here promises a profit.

Related: arbitrage betting bot.

Questions people ask#

Can I find arbitrage with PinnFeed alone?#

No. Arbitrage needs at least two books; PinnFeed provides Pinnacle only.

Does maxStake matter for arbitrage?#

Yes. It caps how much Pinnacle accepts at that price, which caps the Pinnacle leg.

Should I count fees?#

Yes. Exchange commission or payment fees can wipe out a small arbitrage margin.