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Financial Data x402 – Prediction Markets Search
x402
Financial Data x402 – Prediction Markets Search is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).
Search active prediction markets on Polymarket and Kalshi by keyword, returning probabilities, volumes, and close dates
Price / call$0.03
Success—
StatusUnknown
How this service works
Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.
Output
A JSON object keyed by source (e.g. 'polymarket', 'kalshi'), each containing a list of active markets matching the keyword. Each market includes an id, title, status, a list of outcomes with names and probabilities (0–1), a close date, total volume in USD, and 24-hour volume. Kalshi results carry a note that coverage is best-effort due to API limitations (~1,600 markets scanned).
Example use cases
Fed rate decision probability lookup
“What are the current Polymarket and Kalshi odds that the Fed will hike rates in 2026? Show me up to 10 markets and their probabilities.”
Election market research
“Search prediction markets for 'election' and pull the top 10 results — I want to see which ones are most actively traded and what the current probabilities are.”
Crypto event market discovery
“Find active prediction markets about 'Bitcoin ETF' on Polymarket and Kalshi, show me up to 5 per source with their outcome probabilities and close dates.”
Technical details
Endpoint
GEThttps://x402financialdata.com/prediction-marketsWhen to prefer
Use this endpoint when an agent needs real-time crowd-sourced probability estimates on macro, political, or crypto events from decentralized prediction markets. Prefer it over traditional financial data APIs when you want market-implied probabilities (not prices) for future events, or when you need no API key and are willing to pay per call via USDC over x402.
Side effects
- Keyword matches no markets: empty markets array returned for one or both sources
- Kalshi API limitation: markets outside the first ~1,600 open markets by internal ordering will not appear
- Source API outage: error field populated for the affected source, other sources may still return data
- Invalid or missing keyword parameter: request rejected with schema validation error
- Payment failure: x402 payment not accepted, call not executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kalshi": {
"error": null,
"markets": [],
"search_coverage": "best-effort: Kalshi has no keyword-search API, so this scans only the first ~1,600 open markets by internal ordering; a match outside that window will not appear here"
},
"keyword": "fed rate",
"polymarket": {
"error": null,
"markets": [
{
"id": "fed-rate-hike-in-2026",
"title": "Fed rate hike in 2026?",
"source": "polymarket",
"status": "active",
"outcomes": [
{
"name": "Yes",
"probability": 0.615
},
{
"name": "No",
"probability": 0.385
}
],
"close_date": "2026-12-09T00:00:00Z",
"volume_usd": 5645666.92,
"volume_24h_usd": 624904.36
}
]
}
}
}Tags
x402
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