---
title: "Model win probabilities (UFC)"
method: GET
path: "/v1/predictions/upcoming"
tags: ["Predictions"]
---

# Model win probabilities (UFC)

`GET /v1/predictions/upcoming`

## Request

- Base URL: `https://api.ufcalendar.com`
- URL: `https://api.ufcalendar.com/v1/predictions/upcoming`
- Auth: HTTP bearer

UFCalendar model win probabilities for upcoming UFC bouts, published about three weeks ahead of each card and repriced at least weekly. Corner-guarded: a probability is only served while the stored pair matches the bout's current pair — a late opponent swap removes the row and it returns repriced within 30 minutes, rather than mislabeling it. Pass `event=` to narrow to one card (`meta.event` then names it; an unknown event 404s). Not betting advice.

## Query parameters

- `event` string

## Response `200`

Predictions

- PredictionsResponse: `meta.event` names the card when `event=` was passed.
  - `data` Prediction[], required
    - `fight_id` integer, required
    - `event` object, required
      - `id` integer, required
      - `slug` string, required
      - `title` string, required
      - `org` string, required
      - `starts_at` string, date-time, required
    - `fighter_a` PredictedCorner, required
      - `id` integer, required
      - `slug` string, required
      - `name` string, required
      - `win_probability` number, required: 0–1, rounded to 4 places.
    - `fighter_b` PredictedCorner, required
      - `id` integer, required
      - `slug` string, required
      - `name` string, required
      - `win_probability` number, required: 0–1, rounded to 4 places.
    - `model_version` string, nullable, required
    - `generated_at` string, date-time, nullable, required
  - `meta` object, required
    - `event` object
      - `id` integer, required
      - `slug` string, required
      - `title` string, required
      - `status` 'announced' | 'scheduled' | 'live' | 'completed' | 'cancelled' | 'postponed', required: Event lifecycle. `postponed` is stored and filterable.
    - `note` string
    - `ignored_params` string[]: Present only when the request carried query parameters this endpoint does not take — they were ignored. Same list as the `X-UFCalendar-Ignored-Params` header. Sorted, unique.

## Other responses

- `304`: Not Modified — `If-None-Match` matched the current weak `ETag`. Empty body.
- `401`: Missing/invalid API key (`unauthorized`).
- `403`: No active plan on the key's account (`subscription_required`) — choose a plan or start the free 1-day trial at https://www.ufcalendar.com/account/api.
- `404`: Not found (`not_found`; staged-org data 404s until the org is promoted).
- `429`: Rate limited (`rate_limited`) or monthly quota reached (`quota_exceeded`). Honor `Retry-After`.
- `500`: Something broke on our side (`internal_error`). It has been logged under the `request_id`.

---

[API](https://skmtc.dev/ufcalendar/apis/ufcalendar-fight-api.md) · [All operations](https://skmtc.dev/ufcalendar/apis/ufcalendar-fight-api/llms.txt) · [OpenAPI document](https://skmtc.dev/ufcalendar/apis/ufcalendar-fight-api/revisions/9623cc8fb70b?raw)