Odds API by market / MLB
MLB Run Line API
Live spreads odds across every book that posts it, in one REST call — and, unlike any other odds API, every one of those outcomes settled against the official result once play ends.
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 8 September 2026.
Books posting MLB run line
Measured live, not listed from a spec. Coverage moves — a book that has not put its board up yet will not appear until it does, which is exactly what this list is for.
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.
13,120 run line outcomes settled in the last 4 days across 24 books. The 12 most recent:
| Bet | Actual | Result |
|---|---|---|
| Athletics -1.5 | 1.0 | lost |
| Toronto Blue Jays 1.5 | 1.0 | won |
| Athletics 1.5 | 1.0 | won |
| Toronto Blue Jays -1.5 | 1.0 | lost |
| Athletics -1.5 | 1.0 | lost |
| Athletics 4.5 | 1.0 | won |
| Toronto Blue Jays 1.5 | 1.0 | won |
| Athletics -2.5 | 1.0 | lost |
| Toronto Blue Jays 2.5 | 1.0 | won |
| Blue Jays -4.5 | 1.0 | lost |
| Athletics 1.5 | 1.0 | won |
| Toronto Blue Jays -1.5 | 1.0 | lost |
Hit rate, last 4 days
50% of 12642 settled run line legs hit (6318 yes, 6324no). 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 12,642 YES legs out of 13,120 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 Cleveland Guardians @ Baltimore Orioles, 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": "orioles",
"away_team_key": "guardians",
"home_team_id": "mlb:110",
"away_team_id": "mlb:114",
"id": "203340",
"sport_key": "baseball_mlb",
"home_team": "Baltimore Orioles",
"away_team": "Cleveland Guardians",
"commence_time": "2026-09-08T22:35:00Z",
"live": false,
"last_update": "2026-09-08T13:56:13.244786Z",
"merged_from_event_ids": null,
"bookmakers": [
{
"key": "betmgm",
"title": "BetMGM",
"last_update": "2026-09-08T13:54:58.619919Z",
"link": null,
"app_link": null,
"pregame_only": false,
"book_event_id": null,
"markets": [
{
"key": "spreads",
"description": "Run Line Spread",
"last_update": "2026-09-08T13:54:58.619919Z",
"period": null,
"suspended_at": null,
"team": null,
"outcomes": [
{
"name": "Baltimore Orioles",
"description": "",
"price": 155,
"point": -1.5,
"book_updated_at": null,
"book_version": null,
"payout_multiplier": null,
"dfs_odds_type": null,
"last_change_at": "2026-09-08T11:00:37.888247Z",
"last_seen_at": "2026-09-08T13:54:58.619919Z",
"liquidity": null,
"liquidity_updated_at": null,
"line_gap": null,
"book_outcome_id": null,
"outcome_id": null,
"player_id": null
},
{
"name": "Cleveland Guardians",
"description": "",
"price": -190,
"point": 1.5,
"book_updated_at": null,
"book_version": null,
"payout_multiplier": null,
"dfs_odds_type": null,
"last_change_at": "2026-09-08T11:00:37.888247Z",
"last_seen_at": "2026-09-08T13:54:58.619919Z",
"liquidity": null,
"liquidity_updated_at": null,
"line_gap": null,
"book_outcome_id": null,
"outcome_id": null,
"player_id": null
}
]
}
]
}
]
}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 — this exact URL works right now:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/events/203340/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/203340/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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