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Prediction Markets Aggregator (Polymarket + Kalshi)
x402
Prediction Markets Aggregator (Polymarket + Kalshi) is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).
Fetches open prediction markets from Polymarket and Kalshi in a single call, returning question, outcome probabilities, 24h volume, liquidity, closing time, and link, sorted by volume with optional keyword filtering.
Price / call$0.005
Success—
StatusUnknown
How this service works
Open prediction markets from Polymarket and Kalshi in one call: question, outcome probabilities, 24 h volume, liquidity, closing time and link, sorted by volume, with an optional keyword filter. Query: ?q=election&limit=10&sources=polymarket,kalshi
Output
A ranked list of open prediction markets (sorted by 24h volume) from Polymarket and/or Kalshi, each containing: the market question, outcome probabilities, 24-hour trading volume, liquidity, closing timestamp, and a direct link to the market.
Example use cases
Political odds research before debate
“Pull up the top 10 prediction markets about the 2024 US presidential election from both Polymarket and Kalshi, sorted by volume, so I can see what the crowd thinks the probabilities are right now.”
Crypto market sentiment check
“Show me the most liquid open prediction markets about Bitcoin or crypto from Polymarket and Kalshi — I want to see current odds, 24h volume, and when they close.”
Fed rate decision forecasting
“What do prediction markets say about a Fed interest rate cut? Get me relevant markets from Polymarket and Kalshi with their current probabilities and liquidity.”
Technical details
Endpoint
GEThttps://api.x-402.online/v1/markets/prediction?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a unified, real-time view of open prediction markets across both Polymarket and Kalshi in a single call, especially when you want to compare odds, liquidity, and volume across platforms without maintaining integrations with each separately. Ideal for agents doing political or financial sentiment analysis, research on crowd-sourced probabilities, or monitoring which topics have the most active speculative markets.
Side effects
- No markets match the keyword filter — returns empty list
- Upstream Polymarket or Kalshi API unavailable — partial or failed response
- Invalid source parameter — returns error
- Rate limit or payment failure — 402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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