Score bets against the closing line (CLV)

Cost: 5 credits per request, up to 200 bets. Score a list of bets you struck against the closing line each race actually closed at, and get the record back as numbers: per bet the closing price (the named book's, or the market's best or median), the closing-line value in percent, whether it beat the close, the result and the flat-stake P&L; and across the list the average and median CLV, the beat-the-close rate, the win rate and the ROI.

Naming a race. Send the race_id you already hold from next-to-go, events, results or the archive; failing that, venue + meeting_date (AET) + race_number. Naming a runner. runner_ref (the ra:/grv: registry id on results and the archive) is exact; runner_number is the saddlecloth; runner_name is matched the way the feeds match names.

What you are measured against. A closing line is a book's last price within 300 s of the jump. Name a bookmaker and clv_pct is against that book's close (close_book); otherwise against the market reference — best (the highest close across books, the strictest test) or median. close_best and close_median come back on every bet either way, so you can re-cut the record yourself.

Coverage. The archive holds AU and NZ races from archive_floor onward; a bet before that, or on a race no book priced at the close, resolves with a reason and is left out of the averages rather than guessed. Results are settled only when result_status is final; won and pnl are null until then. Betfair exchange prices are withheld.

Plus and above. Free and paid tiers below Plus receive a 403 and are not charged; the 403 carries a sample: five example bets on one recent race, scored the way yours would be.