Answer · AEO

Pinnacle margin calculator via the API

Updated 11 November 2026 · PinnFeed · 2 min read

Answer: you do not need a separate “calculator product”. Every PinnFeed market already carries margin — the overround, sum(1/decimal) - 1. A worked example: prices 2.10, 3.45 and 3.60 give 1/2.10 + 1/3.45 + 1/3.60 - 1 ≈ 0.0438 (4.38%). Compare that with the margin field on /v1/odds or the WebSocket. The same proportional maths yields fair and fairProb. This is the standard multiplicative method, not a unique PinnFeed advantage.

Worked example#

def margin(decimals):
    return sum(1 / d for d in decimals) - 1

# Illustrative moneyline, not a live quote
prices = [2.10, 3.45, 3.60]
print(round(margin(prices), 5))  # 0.04382 — compare with market["margin"]
# fairProb = (1/decimal) / (1 + margin); fair = 1 / fairProb

PinnFeed rounds margin to 5 decimals, fairProb to 5 and fair to 4. If an outcome has no valid price, margin is omitted rather than guessed. Field reference: margin / overround API, no-vig fair odds. To get the margin and fair odds for prices you type in, use the in-browser no-vig calculator.

Pull it from the API#

curl -sS -H "x-api-key: ps_live_..." \
  "https://pinnfeed.io/v1/odds?sport=soccer&market=moneyline&main=true&limit=20"

Then read markets[].margin and each outcome’s decimal. Pair with maxStake (a floor around 100 is a common thin-line filter): max stake. margin, fair and fairProb are on every plan, including Free. The live WebSocket and closing archive need Builder (€99/mo, or €990/yr ≈ €82.50/mo).

A Sheets-oriented walkthrough of the same formula is no-vig calculator in Excel / Sheets.

Try it#

Get a free delayed REST key (no card) to check margin on snapshots, or start a 3-day Builder trial (€99/mo, VAT incl. where applicable) for push and closes. Paid plans: 3-day trial; a card is required and it is charged after day 3 unless you cancel.

Educational content for adults (18+). No tips, no guaranteed profit.

Questions people ask#

Is this different from vig or juice?#

No. Overround, vig and juice describe the same built-in margin. PinnFeed reports it as a fraction (0.025 = 2.5%).

Do you claim a better calculator than other Pinnacle feeds?#

No. The formula is standard. We expose margin on every market so you can check it; we do not claim a unique method.

Which plan do I need to see margin?#

Any plan, including Free. Builder adds the WebSocket and closing history.