Odds API by market / MLB
MLB Run Line API
The spreads board is not posted right now. This page keeps the last measured window — 3,216 settled outcomes — and reactivates on its own the first build after books post the market again. The endpoint, the response shape and the free tier work today.
No credit card. 1,000 requests / day on the free tier.
What MLB run line is
Baseball's handicap, and it is almost always exactly ±1.5 runs — books move the PRICE rather than the number. Alternate run lines arrive in the same response.
How we settle it. Settled against the final run margin. The half-run means it cannot push.
Every number on this page is measured against the live API, never copied from a spec sheet. Last measured 27 October 2026.
Books that last posted MLB run line
Measured on the last slate that carried it, 27 October 2026. When books post it again, this list rebuilds from whichever ones actually do.
Line shopping across all of them is one request — every book arrives in the same bookmakers array, not one call per book. Add ?bookmakers= to narrow it, or use /best-line for the best price per line already ranked.
Recently settled MLB run line outcomes
These are real rows out of the API, not an illustration. Each one was a price on a board before the event and carries the actual figure it was graded against afterwards. No other odds API returns that last column — they stop at the price.
3,216 run line outcomes settled in the last 4-day window it was posted across 79 books. The 12 most recent:
| Bet | Actual | Result |
|---|---|---|
| Milwaukee Brewers -1.5 | -9.0 | won |
| Milwaukee Brewers -2.5 | -9.0 | won |
| Milwaukee Brewers -10.5 | -9.0 | lost |
| Tampa Bay Rays 10.5 | -9.0 | won |
| Milwaukee Brewers -2.5 | -9.0 | won |
| Milwaukee Brewers -3.5 | -9.0 | won |
| Tampa Bay Rays 2.5 | -9.0 | lost |
| Milwaukee Brewers -3.5 | -9.0 | won |
| Tampa Bay Rays 3.5 | -9.0 | lost |
| Milwaukee Brewers -4.5 | -9.0 | won |
| Tampa Bay Rays -1.5 | -9.0 | lost |
| Tampa Bay Rays -2.5 | -9.0 | lost |
Hit rate, last posted window
50% of 3146 settled run line legs hit (1573 yes, 1573 no). Counted on the YES side only — books that price this two-way contribute their Over leg, not both. That is the base rate across the whole priced field, not a per-player figure.
Read off 3,146 YES legs out of 3,216 settled outcomes on this market. The rest are the Under side from books that price it two-way, which answers a different question.
Per-player hit rates and L5 / L10 / L20 splits live on /trends.
Live response
Captured from the real endpoint on Milwaukee Brewers @ Tampa Bay Rays while it was posted, trimmed to one book and three outcomes so the shape stays readable. The full response carries every book and every line, alternates included, in the same call.
{
"home_team_key": "rays",
"away_team_key": "brewers",
"home_team_id": "mlb:139",
"away_team_id": "mlb:158",
"home_team_logo_url": "https://img.mlbstatic.com/mlb-photos/image/upload/w_500,f_png,q_auto/v1/team/139/logo/spot/current",
"away_team_logo_url": "https://img.mlbstatic.com/mlb-photos/image/upload/w_500,f_png,q_auto/v1/team/158/logo/spot/current",
"id": "539799",
"sport_key": "baseball_mlb",
"home_team": "Tampa Bay Rays",
"away_team": "Milwaukee Brewers",
"commence_time": "2026-10-28T00:00:00Z",
"live": false,
"is_outright": false,
"tournament": null,
"tour": null,
"last_update": "2026-10-27T15:29:02.270209Z",
"merged_from_event_ids": null,
"bookmakers": [
{
"key": "admiralbet_de",
"title": "AdmiralBet DE",
"last_update": "2026-10-27T15:28:37.391107Z",
"link": null,
"app_link": null,
"pregame_only": false,
"book_event_id": null,
"markets": [
{
"key": "spreads",
"description": "Handicap",
"last_update": "2026-10-27T15:28:37.391107Z",
"period": null,
"suspended_at": null,
"team": null,
"line_type": "main",
"outcomes": [
{
"name": "Tampa Bay Rays",
"description": "",
"price": -185,
"point": 1.5,
"book_updated_at": null,
"book_version": null,
"payout_multiplier": null,
"dfs_odds_type": null,
"last_change_at": "2026-10-27T13:25:24.379830Z",
"last_seen_at": "2026-10-27T15:28:37.391107Z",
"liquidity": null,
"liquidity_updated_at": null,
"line_gap": null,
"book_outcome_id": null,
"outcome_id": null,
"player_id": null,
"side": "home"
},
{
"name": "Milwaukee Brewers",
"description": "",
"price": 135,
"point": -1.5,
"book_updated_at": null,
"book_version": null,
"payout_multiplier": null,
"dfs_odds_type": null,
"last_change_at": "2026-10-27T13:25:24.379830Z",
"last_seen_at": "2026-10-27T15:28:37.391107Z",
"liquidity": null,
"liquidity_updated_at": null,
"line_gap": null,
"book_outcome_id": null,
"outcome_id": null,
"player_id": null,
"side": "away"
}
]
}
]
}
]
}The response shape is the-odds-api compatible — events, bookmakers, markets, outcomes — so migrating is usually a base URL change.
Try it
1. List MLB events to get an event id:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/events?apiKey=YOUR_API_KEY"2. Pull run line for one game across every book — swap in a live event id from step 1 once books post it again:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/events/539799/odds?apiKey=YOUR_API_KEY&markets=spreads"3. After the game, get the graded outcomes with the actual stat:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/events/539799/results?apiKey=YOUR_API_KEY"Steps 1 and 2 run on the free tier. Step 3 — prop resolution — starts on Hobby at $9/mo. See pricing.
Related endpoints
Other MLB markets
Run Line in other sports
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