API Dati

What this API offers

CoinRithm aggregates prediction markets and forecasting platforms into a single dataset: Polymarket, Kalshi, Metaculus, PredictIt, Limitless, Manifold Markets, and Smarkets. The four endpoints below expose that dataset as plain JSON — global stats and category breakdowns, a ranked and filterable event list with live probabilities, 24h volume and short probability sparklines, single-event detail with cross-source matches and resolution provenance, and a global feed of on-chain whale trades (Polymarket, trades ≥$1,000 notional). No API key, no signup — just JSON over HTTPS.

Quickstart

One request, no auth. This example asks for the single highest-volume open market:

curl "https://api.coinrithm.com/api/prediction-markets/events?status=open&sort=volume24h_desc&limit=1"

Response (trimmed, real shape)

{
  "data": [
    {
      "slug": "world-cup-winner",
      "title": "World Cup Winner",
      "status": "open",
      "volume24h": 68633336.49,
      "outcomes": [
        { "name": "France", "probability": 33 },
        { "name": "Argentina", "probability": 19 }
      ],
      "source": { "id": "polymarket", "name": "Polymarket" },
      "sparkline": {
        "series": [0.2, 0.22, 0.24, 0.29, 0.33, 0.35],
        "leaderOutcomeId": "108233…483842092",
        "capturedAt": "2026-07-03T08:41:49.808Z"
      }
    }
  ],
  "pagination": { "limit": 1, "offset": 0, "hasMore": true }
}

Endpoint reference

Rate limits & fair use

• •No API key or signup required — every endpoint above is a plain public GET over HTTPS.
• •Responses are cached roughly 60 seconds server-side and sized for light, exploratory, or development use: a blog post, a research script, a chatbot answering one question.
• •There is no uptime SLA on the keyless surface, and sustained high-frequency polling may be rate-limited.
• •For production agents, trading bots, or anything polling continuously, use the keyed agent API instead: authenticated crk_live_… keys, per-key rate budgets (120 requests/min, 20 trade-writes/min), and a versioned OpenAPI 3.1 contract.

Stable contract

• •Additive only: once a field on this page is documented, its name and meaning do not change.
• •New fields can appear in responses as the product grows — the field list above is accurate, but not a promise that it is exhaustive.
• •A documented field is never repurposed to mean something else, and it is never silently removed.

Attribution

This data is free to use, including in production. If you publish numbers, charts, or answers built from it, please attribute CoinRithm and link back:

Data by CoinRithm — https://www.coinrithm.com

Attribution helps readers verify the source, and it helps us keep these endpoints open and keyless.

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