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Fanfare MLB Late-Swap Monitor
x402
Fanfare MLB Late-Swap Monitor is a paid API for AI agents from fanfare.run, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).
Returns MLB players whose lineup status or batting order changed within a recent time window, optimized for frequent polling during pre-game windows for daily fantasy late-swap decisions.
Price / call$0.03
Success—
StatusUnknown
How this service works
Tight-window MLB poll target: players whose lineup status / batting order changed since `since` (default now-900s). Cheap to poll every 60s through the pre-game window. Params: date, since (ISO-8601 UTC).
Output
A list of MLB players whose lineup status or batting order position changed after the specified 'since' timestamp on the given date, including player identifiers and details about what changed — suitable for triggering late-swap decisions in daily fantasy contests.
Example use cases
Example prompt
“Check for any MLB lineup or batting order changes since 11:30 AM UTC today, June 15, 2025 — I need to know who got scratched or moved so I can make late swaps before lock.”
Technical details
Endpoint
GEThttps://fanfare.run/v1/fantasy/mlb/late-swapWhen to prefer
Use this endpoint when you need to detect real-time MLB lineup changes in a tight polling loop (every 60 seconds) during the pre-game window for daily fantasy late-swap decisions. It is purpose-built for cheap, frequent polling at $0.03/call and is more efficient than a full slate bundle when you only need delta changes since a recent timestamp.
Side effects
- Missing required 'date' parameter returns a 400 error
- Invalid date format (not YYYY-MM-DD) causes a parsing error
- 'since' timestamp in wrong format (not ISO-8601 UTC) returns an error
- No changes detected in window returns an empty result set
- Date in the distant past or future with no game data may return empty or error
- Payment not included or insufficient returns 402 Payment Required
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"date": "2025-06-15",
"since": "2025-06-15T11:30:00Z"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"slate": {
"date": "2025-06-15",
"window": "all",
"game_count": 15,
"first_pitch_utc": "2025-06-15T16:05:00Z"
},
"errors": [],
"league": "mlb",
"result": {
"changed_players": []
},
"sources": [
{
"name": "mlb-stats-api",
"note": null,
"calls": 2,
"status": "ok",
"version": "v1",
"latency_ms": 18
},
{
"name": "the-odds-api",
"note": null,
"calls": 1,
"status": "ok",
"version": "v4",
"latency_ms": 0
},
{
"name": "open-meteo",
"note": null,
"calls": 15,
"status": "ok",
"version": "v1",
"latency_ms": 0
}
],
"endpoint": "/v1/fantasy/mlb/late-swap",
"warnings": [],
"freshness": [
{
"source": "mlb-stats-api",
"is_stale": false,
"data_type": "schedule",
"fetched_at": "2026-06-08T04:30:35.675533+00:00",
"max_age_seconds": 300
},
{
"source": "the-odds-api",
"is_stale": false,
"data_type": "vegas-totals",
"fetched_at": "2026-06-08T04:30:35.676224+00:00",
"max_age_seconds": 900
},
{
"source": "open-meteo",
"is_stale": false,
"data_type": "weather",
"fetched_at": "2026-06-08T04:30:36.194339+00:00",
"max_age_seconds": 3600
}
],
"request_id": "fnf_2917d959faf94f61b0e89c51889ee29b",
"generated_at": "2026-06-08T04:30:36.194723+00:00"
}Tags
x402
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