Prediction.com APIdocs

Pricing Your keys

Expected Value

Positive EV opportunities where a platform's price is meaningfully mispriced relative to the weighted cross-platform consensus. Unlike arb, EV positions carry directional risk but have positive expected return.

GET/v2/ev

Plans Dev and upPlan rate limits apply

Parameters

min_roifloat

Minimum ROI percentage to include. Default: 0 (no minimum; writer floor is ~1%).

sidestring

Filter: yes | no | both. Default: both.

platformsstring

Filter to specific platforms: kalshi, polymarket, polymarket_us, predictit, prophetx, opinion, predictfun, novig.

limitinteger

Default: 20, max: 100.

Response

as_ofstring

Server timestamp of the response (ISO 8601).

delay_secondsinteger

Signal delay in seconds applied to the response.

opportunitiesobject[]

Current positive expected value opportunities.

Show 6 fields

group_idinteger

Match group ID.

group_titlestring

Market group title.

event_datestring

Event date.

consensus_probabilitynumber

Weighted cross-platform consensus probability.

detected_atstring

When this opportunity was detected (ISO 8601).

legsobject[]

The mispriced leg(s).

Show 7 fields

platformstring

Platform with the mispricing.

market_idstring

Market ID.

source_urlstring

Direct link to the market.

sidestring

"yes" or "no".

pricenumber

Current price on this platform.

roi_pctnumber

Expected return percentage.

ev_usd_per_dollarnumber

Expected net profit per dollar of stake, equal to roi_pct / 100 under the same fee assumptions. Not position-sized profit.

Try it

Sample data

Min ROI %

Side

Platforms

Limit

Sample mode returns a fixed recorded example; input changes apply to live requests. Switch it off to query live data with these parameters.

{
  "as_of": "2026-04-03T18:09:14.399449Z",
  "delay_seconds": 15,
  "opportunities": [
    {
      "consensus_probability": 0.074,
      "detected_at": "2026-04-03T18:08:26Z",
      "event_date": "2026-10-10",
      "group_id": 11633,
      "group_title": "Donald Trump",
      "legs": [
        {
          "ev_usd_per_dollar": 0.8562499999999997,
          "market_id": "11633",
          "platform": "kalshi",
          "price": 0.04,
          "roi_pct": 85.62499999999997,
          "side": "yes",
          "source_url": "https://kalshi.com/markets/KXNOBELPEACE/KXNOBELPEACE-26"
        }
      ]
    },
    {
      "consensus_probability": 0.105,
      "detected_at": "2026-04-03T18:08:26Z",
      "event_date": "2026-11-03",
      "group_id": 18901,
      "group_title": "Democratic party",
      "legs": [
        {
          "ev_usd_per_dollar": 0.48499999999999965,
          "market_id": "18901",
          "platform": "kalshi",
          "price": 0.07,
          "roi_pct": 48.499999999999964,
          "side": "yes",
          "source_url": "https://kalshi.com/markets/KXHOUSERACE/KXHOUSERACE-TN07-26"
        }
      ]
    },
    {
      "consensus_probability": 0.614,
      "detected_at": "2026-04-03T18:08:26Z",
      "event_date": "2026-12-31",
      "group_id": 70564,
      "group_title": "Pete Hegseth",
      "legs": [
        {
          "ev_usd_per_dollar": 0.4231162790697675,
          "market_id": "70564",
          "platform": "polymarket",
          "price": 0.43,
          "roi_pct": 42.31162790697675,
          "side": "yes",
          "source_url": "https://polymarket.com/market/will-pete-hegseth-leave-the-trump-administration-before-2027?r=predictionhunt"
        }
      ]
    }
  ]
}