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x402-factory Odds Compare
x402
x402-factory Odds Compare is a paid API for AI agents from x402-factory.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-12).
Compares implied and vig-adjusted probabilities for a prediction market event across multiple venues (Kalshi, Polymarket) with liquidity depth data.
Price / call$0.02
Success—
StatusUnknown
How this service works
Paid data APIs for AI agents: prediction-market analytics, weather intelligence, weather×market edge signals, and SEC/gov data. Paid endpoints use the x402 protocol (HTTP 402 + USDC on Base): call without payment to receive requirements, retry with an X-PAYMENT header. Machine-readable catalog: /llms.txt. Per-endpoint docs: /docs/{id}.
Output
Returns per-venue implied and vig-adjusted probabilities, order book liquidity depth within 1¢ and 5¢ in USD for each venue (Kalshi, Polymarket), the spread between venues, and a boolean disagreement flag. Also includes metadata with data freshness timestamp, sources, and request ID.
Example use cases
Arbitrage opportunity scanner
“Check if there's a meaningful disagreement right now between Kalshi and Polymarket on the Fed rate cut market — show me the vig-adjusted probabilities and the spread.”
Best-venue trade execution
“I want to buy the YES side of the 'US recession 2025' market. Tell me which venue has the better price — compare Kalshi and Polymarket vig-adjusted odds for that slug.”
AI agent portfolio probability update
“Pull the latest cross-venue probability for the 'Trump wins 2024' prediction market slug and tell me if the venues disagree by more than 2 percentage points.”
Technical details
Endpoint
GEThttps://x402-factory.com/v1/odds/compare/%7Bslug%7DWhen to prefer
Choose this endpoint when you need real-time, cross-venue probability comparison with liquidity depth for a specific prediction market event. It is ideal for arbitrage detection, best-execution routing, and probability normalization workflows. Prefer it over single-venue APIs when venue disagreement or vig-adjusted accuracy matters.
Side effects
- Unknown or invalid slug returns 404 or empty data
- Payment not included returns HTTP 402 with payment requirements in headers
- Stale or unavailable market data may return reduced venue coverage
- Rate limiting or USDC payment failure on Base network causes request rejection
- Market slug format mismatch causes parameter parsing errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"per_venue": [
{
"venue": "kalshi",
"implied_p": 0.5965,
"vig_adjusted_p": 0.5985,
"depth_within_1c_usd": 23836.81,
"depth_within_5c_usd": 80347.82
},
{
"venue": "polymarket",
"implied_p": 0.5702,
"vig_adjusted_p": 0.5716,
"depth_within_1c_usd": 30913.64,
"depth_within_5c_usd": 123491.05
}
],
"venue_spread": 0.0263,
"disagreement_flag": false
},
"meta": {
"docs": "https://x402-factory.com/docs/probability.odds-compare",
"sources": [
"kalshi",
"polymarket"
],
"version": "1.0.0",
"endpoint": "/v1/odds/compare/{slug}",
"data_mode": "live",
"freshness": "realtime",
"request_id": "req_00000000",
"generated_at": "2026-08-21T03:58:58.156Z"
}
}
}Tags
x402
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