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Romny Cross-Venue Odds — RH vs Polymarket Probability Spreads
x402
Romny Cross-Venue Odds — RH vs Polymarket Probability Spreads is a paid API for AI agents from api.romny.dpdns.org, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-19).
Returns probability spread comparisons between Robinhood and Polymarket on matched prediction-market contracts, filterable by direction and minimum spread threshold.
Price / call$0.1
Success—
StatusUnknown
How this service works
RH vs Polymarket probability spreads on matched contracts
Output
A list of matched prediction-market contract pairs (up to 200 rows) showing the RH probability, Polymarket probability, absolute spread, and match confidence score for each pair. Results are filterable by which venue is pricing higher and by minimum spread or confidence thresholds.
Example use cases
Arbitrage opportunity scanner
“Show me the 50 biggest probability spread mismatches between Robinhood and Polymarket right now, only where the spread is at least 4 points and confidence is above 0.7.”
Polymarket-favored mispricing screen
“Find all prediction market contracts where Polymarket is currently pricing higher than Robinhood, with a minimum spread of 3 probability points — give me up to 30 results.”
High-confidence matched contract review
“List the top 25 Robinhood vs Polymarket matched contracts with the highest match confidence, regardless of which side is richer, and filter to spreads of at least 5 probability points.”
Technical details
Endpoint
GEThttps://api.romny.dpdns.org/v1/rh/spreads?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time cross-venue probability spread data between Robinhood and Polymarket on matched contracts, especially for arbitrage screening, mispricing detection, or comparative odds analysis. Prefer this over raw Polymarket or RH catalog endpoints when you need the differential (spread) rather than absolute prices.
Side effects
- No contracts meet the minimum spread or confidence thresholds — returns empty result set
- Invalid enum value for 'side' parameter — returns 400 validation error
- Limit out of range (below 1 or above 200) — returns 400 error
- Upstream Robinhood or Polymarket data unavailable — may return stale or partial results
- Payment not provided or rejected — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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